ࡱ>     bjbjcTcT 4>>$ $ ggggg{{{8gl{Q"(":5#5#5#m$:$$ PPPPPPPS#VPg$i$i$$$Pgg5#5#4Q1+1+1+$g5#g5#P1+$P1+1+bG42K5#`%{&I>PQ0QI^V(V|2K2K8VgjKl$$1+$$$$$PP=*$$$Q$$$$V$$$$$$$$$$ -: National Drug Monograph Bendamustine (Treanda) March 2010 VA Pharmacy Benefits Management Services, Medical Advisory Panel, and VISN Pharmacist Executives The purpose of VA PBM Services drug monographs is to provide a comprehensive drug review for making formulary decisions. These documents will be updated when new clinical data warrant additional formulary discussion. Documents will be placed in the Archive section when the information is deemed to be no longer current. Executive Summary: Bendamustine received FDA-approval for the treatment of CLL and indolent, B-cell Non-Hodgkins Lymphomas (NHL) that are refractory or intolerant to rituximab. Efficacy: Bendamustine has not been compared to purine-analog therapy for the treatment of CLL, which is considered the standard of care for medically fit patients. Bendamustine was compared to chlorambucil for the treatment of CLL, which is considered the treatment of choice in elderly patients who may not be able to tolerate purine-analog therapy. An increase in PFS was noted with bendamustine vs. chlorambucil (21.6 vs. 8 months; p < 0.001). Two trials evaluated use of bendamustine in rituximab-refractory NHL. Overall Response Rates (ORR) of 77% and 75% were obtained with a median duration of response (DOR) reported to be 9.2 and 6.7 months, respectively. Bendamustine also has activity in combination with rituximab and may prove to replace the standard of care in the first line setting of indolent, advanced follicular and mantle cell NHL. Phase III data is only available in abstract form at this time. Safety: The toxicities of bendamustine are primarily hematologic and may require the addition of white blood cell (WBC) growth factor support, red blood cell (RBC) transfusions and erythropoietin stimulating agents (ESAs). The most common non-hematologic adverse events occurring in the CLL study population were nausea (20%), vomiting (16%) and pyrexia (24%). The most common events leading to study withdrawl were hypersensitivity (2%) and pyrexia (1%). Compared to chlorambucil for CLL, the bendamustine arm had more reports of gastrointestinal toxicities (nausea, vomiting, diarrhea) and fatigue/weakness The most common non-hematologic adverse events occurring in the NHL study population were nausea (75%), fatigue (57%), vomiting (40%), diarrhea (37%) and pyrexia (34%). Those categorized as grade 3 / 4 events were fatigue, febrile neutropenia, pneumonia, hypokalemia and dehydration. Background: Chronic Lymphocytic Leukemia (CLL) is a hematopoietic condition characterized by a clonal proliferation of malignant B cells that have accumulated in the bone marrow, lymphoid tissue and peripheral blood. The median age of diagnosis is 60 years, with only 10-15% of cases diagnosed in those less than 50 years. The natural history of CLL is variable. Patients who are asymptomatic with early stage disease have a median survival of greater than 10 years. Those with more advanced stage disease or who are symptomatic, have a median survival between 18 months and 3 years. Treatment of CLL is indicated for those who are symptomatic or have evidence of progressive disease. Median survival improves to ~ 5 years with treatment. It is estimated that 15,000 adults will be diagnosed with CLL in 2009 and that ~4400 will die from the disease. Options for treating CLL include alkylating agents, purine analogs, monoclonal antibodies or a combination of these drugs. These drug classes have not been directly compared to each other. Chlorambucil, an alkylating agent, had been the standard of care for many years prior to the advent of purine analog therapy. It serves as a comparator for some of these newer agents. Overall survival rates with these therapies are similar. There is variance in their complete remission rates, ability to affect progression-free survival and toxicity profile. The choice of therapy depends upon patient characteristics, potential toxicity and the goals of therapy. The most common indolent Non-Hodgkins Lymphoma is follicular lymphoma. Those categorized as high-risk in the Follicular Lymphoma International Prognostic Index (FLIPI) have estimated 5 and 10-year survival rates of 52% and 36%, respectively. Those considered to be low-risk have the best rates of 91% and 71%, respectively. Treatment options for early stage disease include radiation therapy, single/combination therapy or observation. In advanced stage disease, first-line therapies may be repeated. Other treatment options include radioimmunotherapy, combination chemotherapy and transplant. Introduction The purposes of this monograph are to (1) evaluate the available evidence of safety, tolerability, efficacy, cost, and other pharmaceutical issues that would be relevant to evaluating bendamustine for possible addition to the VA National Formulary; (2) define its role in therapy; and (3) identify parameters for its rational use in the VA. Pharmacology/Pharmacokinetics Bendamustine is a bifunctional mechlorethamine derivative that contains a purine-like benzimidazole ring. Structurally, bendamustine is made up of three elements: a 2-chloroethylamine alkylating group, a benzimidazole ring and a butyric acid side chain.5 The alkylating group functions similar to other nitrogen mustard compounds. The butyric acid side chain is shared with chlorambucil. The benzimidazole ring is unique to bendamustine and may contribute to its differing activity and distinguish it from other alkylating agents. The exact mechanism of action is unknown. Bendamustine is cell-cycle phase nonspecific with its cytostatic activity occurring against both quiescent and dividing cells. Absorption: The Cmax typically occurs at the conclusion of an intravenous dose. Dose proportionality of bendamustine has not been studied. Distribution: The mean steady state volume of distribution ~ 25 L. Plasma protein binding ranged from 94 96% in vitro. Data suggest that bendamustine is not likely to displace or be displaced by highly protein bound drugs. Metabolism: Bendamustine is primarily metabolized via hydrolysis to metabolites with low cytotoxic activity. Concentrations of two minor metabolites formed via CYP1A2 are 1/10 and 1/100 that of the parent compound, suggesting that cytotoxic activity is primarily due to bendamustine. In vitro data indicates that bendamustine does not inhibit or induce cytochrome P450 isoenzymes. Elimination: Preclinical studies determined that approximately 90% of bendamustine was recovered in excreta primarily in the feces. Clearance is ~ 700 ml/minute. After a single dose infused over 1 hour, the intermediate half-life of the parent compound was 40 minutes. The terminal elimination half-lives of the two metabolites are approximately 3 hours and 30 minutes. Little to no plasma accumulation is expected with bendamustine given on days 1 and 2 of a 28-day cycle. FDA Approved Indication(s) and Off-label Uses Bendamustine received FDA-approval for Chronic Lymphocytic Leukemia (CLL) and indolent B-cell Non-Hodgkins Lymphoma (NHL) that has progressed during or within six months of treatment with rituximab or a rituximab-containing regimen. Off-label uses of bendamustine include metastatic breast cancer, first-line in indolent and mantle cell NHL, T-cell NHL, salvage therapy in aggressive B-cell NHL, primary therapy in aggressive B-cell NHL for those unable to tolerate anthracycline-based therapy, multiple myeloma, Waldenstroms Macroglobulinemia, hepatocellular carcinoma, small cell lung cancer and soft tissue sarcoma. Current VA National Formulary Alternatives Alternatives for CLL Formulary statusChlorambucilOn formularyFludarabine containing regimens Fludarabine-rituximab (FR) Fludarabine-cyclophosphamide-rituximab (FCR)All on formularyPentostatin containing regimens Pentostatin-cyclophosphamide-rituximab (PCR)All on formulary Cyclophosphamide vincristine- prednisone (CVP)All on formularyAlemtuzumabNon-formularyAlternatives for NHLRadioimmunoconjugates 90Y-ibritumomab 131I-tositumomabAll non-formularyBortezomib On formularyLenalidomide (off label)On formulary Dosage and Administration1, 10 For CLL*: Bendamustine 100 mg/m2 IV over 30 minutes on days 1 and 2 of a 28-day cycle, for up to 6 cycles. * Of note, 100 mg/m2 was the dose given to patients in the phase III trial. Data exists that suggest a lower dose (70 mg/m2 on days 1 and 2) be used in pretreated patients, especially if previously exposed to fludarabine.10 Doses should be delayed in the event of grade 4 hematologic or clinically significant grade 2 or greater non-hematologic toxicity. Once non-hematologic toxicity has recovered to < grade 1 and/or blood counts have improved (defined as ANC > 1 x 109 /L, platelets > 75 x 109 /L), bendamustine can be reinitiated at the discretion of the treating physician. Dose reduction may be warranted. Dose modifications for hematologic toxicity based on initial dose of 100 mg/m2/day: Grade 3 or greater toxicity, reduce dose to 50 mg/m2 on days 1 and 2; If grade 3 toxicity recurs, reduce dose to 25 mg/m2 on days 1 and 2 Dose modifications for non-hematologic toxicity: Grade 3 or greater toxicity, reduce dose to 50 mg/m2 on days 1 and 2; Dose re-escalation in subsequent cycles may be considered at the discretion of the treating physician. For NHL*: Bendamustine 120 mg/m2 IV over 60 minutes on days 1 and 2 of a 21-day cycle, for up to 8 cycles * Of note, the FDA-approved dosing of bendamustine in NHL is 120 mg/m2 on days 1 and 2 of a 21-day cycle. The optimal dosing for the elderly or heavily pretreated patients is unknown, therefore lower doses may be considered for these populations. Doses should be delayed in the event of grade 4 hematologic or clinically significant grade 2 or greater non-hematologic toxicity. Once non-hematologic toxicity has recovered to < grade 1 and/or blood counts have improved (defined as ANC > 1 x 109 /L, platelets > 75 x 109 /L), bendamustine can be reinitiated at the discretion of the treating physician. Dose reduction may be warranted. Dose modifications for hematologic toxicity: Grade 4 toxicity, reduce dose to 90 mg/m2 on days 1 and 2; If grade 4 toxicity recurs, reduce dose to 60 mg/m2 on days 1 and 2 Dose modifications for non-hematologic toxicity: Grade 3 or greater toxicity, reduce dose to 90 mg/m2 on days 1 and 2; If grade 3 toxicity recurs, reduce dose to 60 mg/m2 on days 1 and 2 Reconstitution/preparation for Intravenous Administration: Aseptically reconstitute each vial of drug Add 5 ml of Sterile Water for Injection, USP to each 25 mg bendamustine vial Add 20 ml of Sterile Water for Injection, USP to each 100 mg vial Shake well to yield a clear, colorless to pale yellow solution of a final concentration of 5 mg/ml Aseptically withdraw the volume needed for required dose and transfer into a 500 ml bag of 0.9% Sodium Chloride Injection, USP. Alternatively, 2.5% Dextrose/0.45% Sodium Chloride Injection, USP may be considered. No other diluents have been shown to be compatible. Once drug is diluted, the final admixture is stable for 24 hours under refrigerated conditions (2-8C or 36-47F) or for 3 hours when stored at room temperature (15-30C or 59-86F) and room light. Dosing in Special Populations: Renal Impairment Bendamustine should be used with caution in patients with mild to moderate renal impairment; avoid use of bendamustine in patients with estimated Clcr < 40 ml/min. Hepatic Impairment Bendamustine should be used with caution in patients with mild hepatic impairment; avoid use in patients with moderate or severe hepatic impairment. Moderate hepatic impairment is defined as AST or ALT 2.5-10 x ULN and total bilirubin 1.5-3 x ULN. Severe impairment is defined as total bilirubin > 3 x ULN. Efficacy Measures for CLL and NHL2, 3 Chronic Lymphocytic Leukemia The response criteria according to the National Cancer Institute-Sponsored Working Group Guidelines2 for CLL were used. Final assessment of best response was conducted by an Independent Committee for Response Assessment. Classification by this group was based on the NCI Group criteria. VariableNCI Working Group CriteriaComplete Response (CR) Physical exam Symptoms Lymphocytes (x 109/L) Neutrophils (x 109/L) Platelets (x 109/L) Hgb (g/dL) Bone marrow lymphs (%) Normal None < 4 > 1.5 > 100 > 11 (untransfused) < 30; no nodulesPartial Response (PR) Physical exam (nodes, and/or liver, spleen) Plus > 1 of: Neutrophils (x 109/L) Platelets (x 109/L) Hgb (x 109/L) > 50% decrease > 1.5 > 100 > 11 or 50% improvementDuration of CR or PR> 2 monthsProgressive Disease (PD) Physical exam (nodes, liver, spleen) Circulating lymphocytes Other > 50% increase or new > 50% increase Richters syndromeStable Disease (SD)All others Non Hodgkins Lymphoma The response criteria used in NHL is based upon modification to the International Working Group Response Criteria.3 The modification specified that a persistently positive bone marrow in patients who met all other criteria for a CR would be scored as a PR. Duration of response (DR) was also an evaluable endpoint. CategoryPhysical examLymph nodes (LN)LN massesBone marrowCRNormalNormalNormalNormalCR/u*Normal NormalNormal NormalNormal > 75% decreaseIndeterminate Normal or indeterminatePRNormal Normal ! liver/spleenNormal > 50% decrease > 50% decreaseNormal > 50% decrease > 50% decreasePositive Irrelevant Irrelevant Relapse/PD! liver/spleen; new sitesNew or !New or !reappearance*CR unconfirmed Summary of efficacy findings CLL: A phase III randomized trial compared bendamustine to chlorambucil in CLL patients who were previously untreated.4 Bendamustine was administered as 100 mg/m2 day on days 1 and 2 every 4 weeks. Chlorambucil was given as 0.8 mg/kg by mouth on days 1 and 15. Cycles were repeated every 4 weeks for up to 6 cycles. The primary endpoints of this trials were overall response rate (ORR) and progression-free survival (PFS). A total of 319 patients were enrolled and included as the intent-to-treat (ITT) population. The results indicate that those in the bendamustine arm had a greater ORR compared to those in the chlorambucil arm (68 vs. 31%; p < 0.001). The median PFS was greater as well (21.6 vs. 8.3 months; p < 0.001). Median duration of response was longer for the bendamustine arm (21.8 vs. 8 months). A Phase I/II dose-finding study in pretreated CLL patients with relapsed or refractory disease was performed by the German CLL Study Group.10 Eligible patients had Binet stage C or B with active disease and had received at least one prior therapy (including chlorambucil or fludarabine). A total of 16 patients were enrolled with a median age of 67 years. After multiple 10mg/m2 dose-reductions due to toxicity, the group reported that bendamustine 70 mg/m2/day given on days 1 and 2 of a 28-day cycle was the maximum tolerated dose in this pretreated population. Although a secondary endpoint, they also reported efficacy as six patients achieved responses. The duration of responses varied from 7 to 43.6 months. NHL: Two studies evaluated the use of bendamustine in rituximab-refractory, indolent B-cell NHL. The first, by Friedberg et al. included those with indolent (80%) and transformed NHL (20%).8 A total of 76 patients were given bendamustine 120 mg/m2/day on days 1 and 2 of a 21-day cycle. The primary endpoint was overall response rate (defined as CR, CRu, SD, PR). Of the 76 enrolled patients, the median age of was 63 years. They had received a median of 2 prior therapies. An overall response rate of 77% was observed (34% CR/CRu, 43% PR). The median duration of response was 6.7 months (95% CI, 5.1 9.9). The second trial, by Kahl et al. performed a similar trial in those with an indolent NHL histology, but with a larger patient base (n = 100).6 Bendamustine was given as 120 mg/m2/day on days 1 and 2 of a 21-day cycle. The primary endpoint was overall response rate. Of the 100 patients, their median age was 60 years and they had received a median of 2 prior therapies. In this trial, the ORR was 75% (14% CR, 3% CRu, 58% PR). The median duration of response was 9.2 months (95% CI, 7.1 10.8). Bendamustine is being studied off label in combination with rituximab for relapsed indolent and mantle cell NHL. Robinson et al designed a phase II, multicenter trial evaluating the use of rituximab given with bendamustine.7 Of the 67 patients studied, 56% had received prior rituximab therapy while 44% were rituximab-nave. Patients had received a median of one prior chemotherapy regimen. The overall response rate was 92% (41% CR, 14% CRu, 38% PR). The median duration of response was 21 months (95% CI, 18 24) and median PFS was 23 months (95% CI, 20 26). Rummel et al evaluated the combination of bendamustine with rituximab as first-line therapy for advanced follicular, indolent and mantle cell lymphomas.9 The data was presented at a recent American Society of Hematology meeting, but is only available in abstract form at the time of this writing. In a phase III, comparative fashion, rituximab plus bendamustine (BR) was compared to rituximab plus CHOP (CHOP-R). A total of 549 patients were randomized and 513 were evaluable for efficacy data. The median age of participants was 64 years. The primary endpoint was PFS. Results indicate that PFS was greater in the BR arm compared to CHOP-R (54.8 vs. 34.8 months; p < 0.0002). Overall response rates were similar 93.8% BR vs. 93.5% CHOP-R. With a better tolerability profile noted in this trial, it suggests that BR has the potential to become a new first-line option for this patient population. For further details on the efficacy results of the clinical trials, refer to  REF _Ref80503441 \h  \* MERGEFORMAT Appendix: Clinical Trials (page 14). Adverse Events (Safety Data) Experience in CLL Table 1. Non-Hematologic Adverse Events Occurring in at least 5% of CLL Clinical Trial Participants Number (%) of patientsBendamustine (n = 153)Chlorambucil (n = 143)Adverse eventAll gradesGrade 3 / 4All gradesGrade 3 / 4Nausea31 (20)1 (< 1)21 (15)1 (< 1)Vomiting24 (16)1 (< 1)9 (6)0Diarrhea14 (9)2 (1)5 (3)0Pyrexia36 (24)6 (4)8 (6)2 (1)Fatigue14 (9)2 (1)8 (6)0Asthenia13 (8)06 (4) 0Chills9 (6)01 (< 1)0Hypersensitivity7 (5)2 (1)3 (2)0Nasopharyngitis10 (7)012 (8)0Infection9 (6)3 (2)1 (< 1)1 (< 1)Herpes Simplex5 (3)07 (5)0Hyperuricemia11 (7)3 (2)2 (1)0Rash12 (8)4 (3)7 (5)3 (2) Table 2. Hematologic Lab Abnormalities in Clinical Trial Participants Bendamustine (n = 150)Chlorambucil (n = 141)Lab parameterAll gradesGrade 3 / 4All gradesGrade 3 / 4Hgb !134 (89)20 (13)115 (82)12 (9)Platelet !116 (77)16 (11)110 (78)14 (10)Leukocytes !92 (61)42 (28)26 (18)4 (3)Lymphocytes !102 (68)70 (47)27 (19)6 (4)Neutrophils !113 (75)65 (43)86 (61)30 (21) Experience in NHL Table 3. Non-Hematologic Adverse Events Occurring in at least 5% of NHL Clinical Trial Participants Bendamustine (n = 176)Adverse eventAll gradesGrade 3 / 4Tachycardia13 (7)0Nausea132 (75)7 (4)Vomiting71 (40)5 (3)Diarrhea65 (37)6 (3)Constipation51 (29)1 (< 1)Stomatitis27 (15)1 (< 1)Abdominal pain22 (13)2 (1)Pyrexia59 (34)3 (2)Fatigue101 (57)19 (11)Asthenia19 (11)4 (2)Chills24 (14)0Herpes zoster18 (10)5 (3)URI18 (10)0UTI17 (10)4 (2)Pneumonia14 (8)9 (5)Febrile neutropenia11 (6)11 (6)Oral candidiasis11 (6)2 (1)Anorexia40 (23)3 (2)Dehydration24 (14)8 (5)Hypokalemia15 (9)9 (5)Back pain25 (14)5 (3)Headache36 (21)0Insomnia23 (13)0Cough38 (22)1 (< 1)Rash28 (16)1 (< 1) Table 4. Hematologic Lab Abnormalities in NHL Clinical Trial Participants Bendamustine (n = 176)Lab parameterAll gradesGrade 3 / 4Hgb !8811Platelets !8625Leukocytes !9456Lymphocytes !9994Neutrophils !8660 Sentinel Events (Deaths and Other Serious Adverse Events) Three patients (2%) died from marrow suppressive-adverse events. Common Adverse Events The most common adverse events were bone marrow suppressive effects as noted in both CLL and NHL trials. Red cell transfusions were administered to 20% of participants receiving bendamustine in the CLL trial compared to 6% of those who received chlorambucil. The most common serious adverse events noted in the NHL trials were febrile neutropenia and pneumonia, occurring in > 5% of patients. The most common non-hematologic adverse events occurring in the CLL study population were nausea (20%), vomiting (16%) and pyrexia (24%). The most common events leading to study withdrawl were hypersensitivity (2%) and pyrexia (1%). The most common non-hematologic adverse events occurring in the NHL study population were nausea (75%), fatigue (57%), vomiting (40%), diarrhea (37%) and pyrexia (34%). Those categorized as grade 3 / 4 events were fatigue, febrile neutropenia, pneumonia, hypokalemia and dehydration. Bendamustine is considered to be moderately emetogenic. Appropriate premedication with a serotonin antagonist and corticosteroid should be provided. Other Adverse Events Adverse reactions noted in the leukemia trials included asthenia, fatigue, malaise, weakness, dry mouth, somnolence, cough, constipation, headache, mucosal inflammation and stomatitis. Other adverse reactions noted in the lymphoma population include acute renal failure, cardiac failure, hypersensitivity, skin reactions, pulmonary fibrosis and myelodysplastic syndrome. Those events occurring less frequently include hemolysis, dysgeusia/taste disorder, atypical pneumonia, sepsis, herpes zoster, erythema, dermatitis and skin necrosis. Skin reactions (including SJS and TEN) have been reported in the post-marketing phase when bendamustine was given in conjunction with allopurinol and other medications associated with these syndromes. Infusion reaction symptoms include fever, chills, pruritis and rash. Premedication to prevent severe reactions, antihistamines, antipyretics and corticosteroids, may be considered. The manufacturer recommends the administration of premedications if a grade 1 or 2 reaction was experienced. Clinicians may choose to premedicate in an attempt to prevent any/all infusion-related reactions. Tolerability The total number of patients experiencing at least one adverse reaction in the leukemia trial was 121 (79%). A total of 52 patients (34%) experienced a grade 3 / 4 reaction. The most common events leading to study withdrawl were hypersensitivity (2%) and pyrexia (1%). The total number of patients experiencing at least one adverse reaction in the lymphoma trials was 176 (100%). A total of 94 patients (53%) experienced a grade 3 / 4 reaction. Precautions/Contraindications Precautions Myelosuppression Patients are likely to experience myelosuppression. In the lymphoma studies, 98% of patients had grade 3 / 4 marrow suppression. Three patients (2%) died from marrow suppressive-adverse events. Closely monitor leukocytes, neutrophils, hemoglobin and platelets. Nadir counts were observed during the third week of therapy. Delays in therapy may be needed if counts have not recovered by day 1 of the next cycle. ANC should be > 1 x 109/L and platelet count should be > 75 x 109/L before next cycle is given. Infections Pneumonia and sepsis have been reported in clinical trials and post-marketing reports. Infection has been associated with hospitalization and death. Monitor for signs and symptoms of infection and treat promptly. Infusion reactions and anaphylaxis Infusion reaction symptoms include fever, chills, pruritis and rash. Anaphylactoid reactions have occurred in rare instances, particularly in second and subsequent cycles. Premedication to prevent severe reactions, antihistamines, antipyretics and corticosteroids, should be considered. The manufacturer recommends the administration of premedications if a grade 1 or 2 reaction was experienced. Clinicians may choose to premedicate in an attempt to prevent any/all infusion-related reactions. Premedications for infusion-related reactions were not provided in any of the clinical trials. For those who experience grade 3 or 4 infusion-related reactions, therapy should be discontinued. Tumor Lysis Syndrome (TLS) TLS has been reported in clinical trials with bendamustine. Onset of TLS tends to be within the first cycle of therapy. Without intervention, TLS may lead to acute renal failure and death. Preventative measures should be taken. Of note, there have been post-marketing reports of skin toxicity when allopurinol was given concomitantly with bendamustine. Monitor closely for TLS and potential skin toxicity. Skin Reactions Skin reactions including Toxic Epidermal Necrolysis (TEN) and Stevens-Johnson Syndrome (SJS) have been reported in clinical trials and post-marketing reports. The relationship to bendamustine cannot be determined as these reactions were noted when the drug was given in combination with anticancer therapy, allopurinol and other medications known to cause these syndromes. Monitor for skin reactions closely, especially if bendamustine is given with another therapy that has been associated with these conditions. If reaction worsens or progresses, consider holding or discontinuing bendamustine therapy. Other malignancies Pre-malignant and malignant conditions have developed in patients who have been treated with bendamustine. The association with bendamustine is unclear. Use in pregnancy Bendamustine can cause fetal harm. Women should be advised to avoid becoming pregnant throughout treatment and for 3 months after the end of treatment. Men receiving bendamustine should use a reliable form of contraception during the same time period. Contraindications Bendamustine is contraindicated in patients with known hypersensitivity to bendamustine or mannitol. Avoid use of bendamustine in patients with renal impairment as evidenced by Clcr < 40 ml/min. Avoid use in patients with moderate or severe hepatic impairment. Moderate hepatic impairment is defined as AST or ALT 2.5-10 x ULN and total bilirubin 1.5-3 x ULN. Severe impairment is defined as total bilirubin > 3 x ULN. Look-alike / Sound-alike (LA / SA) Error Risk Potential As part of a JCAHO standard, LASA names are assessed during the formulary selection of drugs. Based on clinical judgment and an evaluation of LASA information from four data sources (Lexi-Comp, USP Online LASA Finder, First Databank, and ISMP Confused Drug Name List), the following drug names may cause LASA confusion: LA/SA for generic name : LA/SA for trade name <Treanda>: <Truvada, Trental"!, Trandate"! Inj sol, Truvada"!> Drug Interactions Drug-Drug Interactions Active metabolites are formed via cytochrome P450 CYP1A2. Inhibitors of CYP1A2 (ie. fluvoxamine, ciprofloxacin) have the potential to increase plasma bendamustine concentrations. Inducers of CYP1A2 (ie. omeprazole, smoking) have the potential to decrease plasma concentrations of bendamustine and increase concentrations of its active metabolites. Acquisition Costs Table #1 Cost Comparison in CLL and NHL* DrugDoseCost/Cycle/Patient ($)Cost/Course/Patient ($)CLLBendamustine 100 mg/m2 IV on days 1, 2 q 28 days x 6 cycles$5333.96$32,003.76Chlorambucil0.8 mg/kg PO on days 1, 15 q 28 days x 6 cycles$81.76 $490.56Fludarabine cyclophosphamide (FC)F 20 mg/m2 IV on days 1 5; C 600 mg/m2 IV on day 1; q 28 days x 6 cycles$716 $26.66 $4296.00 $159.96Fludarabine rituximab (FR)F 25 mg/m2 IV on days 1 5; R 375 mg/m2 IV on day 1; q 28 days x 6 cycles$716 $2618.97 $4296.00 $15,713.82Fludarabine-cyclophosphamide-rituximab (FCR)F 25 mg/m2 IV on days 1, 2, 3; C 250 mg/m2 IV on days 1, 2, 3; R 500 mg/m2 IV on day 1; q 28 days x 6 cycles$429.60 $39.99 $3740.30 $2577.60 $239.94 $22,441.80NHLBendamustine120 mg/m2 IV on days 1, 2 q 21 days x 6 cycles$6007.64$36,045.84*cost estimates based on average individual 70 kg/1.85 m2; FSS/BIG4 as of January 2010 Pharmacoeconomic Analysis There have not been any pharmacoeconomic analyses of bendamustine published to date. Conclusions The optimal role of bendamustine has not yet been defined. The phase III trial which led to its FDA-approval in CLL was as first-line therapy, yet other trials indicate that activity exists in those who received prior treatments. Bendamustine has activity in CLL, which is comparable to chlorambucil, and has not been compared to purine-analog therapy. Although PFS is improved with bendamustine, it does not have the advantages of low toxicity and convenience as an oral formulation like chlorambucil. The literature suggests that dosing in CLL should depend on if patients were pretreated. Those who received prior fludarabine therapy may better tolerate a lower initial starting dose. Bendamustine has activity in indolent B-cell lymphomas that are refractory or intolerant to rituximab. Bendamustine also has activity in combination with rituximab and may prove to replace the standard of care in the first line setting of indolent, advanced follicular and mantle cell lymphoma, yet phase III data is only available in abstract form at this time. The optimal dosing for the elderly or heavily pretreated patients is unknown, therefore lower doses may be considered for these populations. The major toxicities are primarily hematologic in nature and may require the addition of WBC growth factors, PRBC transfusions and ESAs. Patients should be monitored for infusion-related reactions during therapy and consideration given to providing premedication such as acetaminophen and diphenhydramine. Due to the moderate emetogenic potential, patients should be premedicated with a serotonin antagonist and corticosteroid. Breakthrough antiemetics should be provided with appropriate monitoring for nausea and vomiting. Providers need to assess tumor burden prior to starting therapy and consider initiating tumor lysis prophylaxis as cases of TLS have been reported. Use caution when giving bendamustine with allopurinol and other drugs that can cause SJS and TEN as post-marketing experience indicates that cases of SJS and TEN have occurred. A causal relationship has not been defined. Due to the structural relationship of bendamustine to purine analogs, individuals at risk for opportunistic infections may benefit from prophylactic antibiotics. References: 1. Bendamustine (Treanda) package insert. Cephalon, Inc. Frazer, PA. October 2009. 2. Cheson BD, et al. National Cancer Institute-Sponsored Working Group Guidelines for Chronic Lymphocytic Leukemia: Revised Guidelines for Diagnosis and Treatment. Blood 1996; 87 (12): 4990. 3. Cheson BD, et al. Report of an International Workshop to Standardize Response Criteria for Non-Hodgkins Lymphoma. J Clin Oncol 1999; 17(4): 1244. 4. Knauf WU, et al. Phase III Randomized Study of Bendamustine Compared With Chlorambucil in Previously Untreated Patients With Chronic Lymphocytic Leukemia. J Clin Oncol 2009; 27 (26): 4378. 5. Leoni LM, et al. Bendamustine (Treanda) Displays a Distinct Pattern of Cytotoxicity and Unique Mechanistic Features Compared with Other Alkylating Agents. Clin Cancer Res 2008; 14 (1): 309. 6. Kahl BS, et al. Bendamustine is Effective Therapy in Patients with Rituximab-Refractory, Indolent B-cell Non-Hodgkin Lymphoma. Results from a Multicenter Study. Cancer 2009; 000:000-000. DOI: 10.1002/cncr.24714,  HYPERLINK "http://www.interscience.wiley.com" www.interscience.wiley.com 7. Robinson KS, et al. Phase II Multicenter Study of Bendamustine Plus Rituximab in Patients with Relapsed Indolent B-Cell and Mantle Cell Non-Hodgkins Lymphoma. J Clin Oncol 2008; 26 (27): 4473. 8. Friedberg JW, Cohen P, Chen L, et al. Bendamustine in Patients with Rituximab-Refractory Indolent and Transformed Non-Hodgkins Lymphoma: Results from a Phase II Multicenter, Single-Agent Study. J Clin Oncol 2008; 26: 204. 9. Rummel MJ, Niederle N, Maschmeyer G, et al. Bendamustine Plus Rituximab is Superior in Respect of PFS and CR Rate when Compared to CHOP Plus Rituximab as First-Line Treatment of Patients with Advanced Follicular, Indolent and Mantle Cell Lymphomas: Final Results of a Randomized Phase III Study of the StiL (Study Group Indolent Lymphomas, Germany). Annual ASH Proc 2009; abstract 405. 10. Bergmann MA, Goebeler ME, Herold M, et al. Efficacy of Bendamustine in Patients with Relapsed or Refractory Chronic Lymphocytic Leukemia: Results of a Phase I/II Study of the German CLL Study Group. Haematologica 2005; 90: 1357 11. Lissitchkov T, Arnaudov G, Peytchev D, Merkle Kh. Phase I/II Study to Evaluate Dose Limiting Toxicity, Maximum Tolerated Dose, and Tolerability of Bendamustine HCl in Pre-Treated Patients with B-Chronic Lymphocytic Leukemia Requiring Therapy. J Cancer Res Clin Oncol. 2006; 132 (2): 99. Prepared April 2010. Contact person: Berni Heron, Pharm.D., BCOP Appendix: Clinical Trials Table 1. Clinical Trials in CLL CitationKnauf WU, et al. Phase III Randomized Study of Bendamustine Compared With Chlorambucil in Previously Untreated Patients With Chronic Lymphocytic Leukemia. J Clin Oncol 2009; 27:4378-4384. Study GoalsCompare the efficacy and tolerability of bendamustine with chlorambucil in previously untreated patients with CLLMethodsStudy Design Phase III, randomized (1:1), open-label, parallel-group, multicenter, international trial Arms: bendamustine 100 mg/m2/day IV on days 1, 2 every 4 weeks vs. chlorambucil 0.8 mg/kg PO on days 1 and 15 every 4 weeks for a maximum of 6 cycles. Efficacy measures: CR, PR, SD, PD for > 8 weeks Assessment: performed at 3-month intervals Primary endpoints: overall RR and PFS Secondary endpoints: TTP, duration of remission, OS Safety endpoints: infection rates, adverse events Use of hematopoietic growth factors was discouraged. Data Analysis Stats performed on ITT patient population Safety analysis performed on all who received at least one dose of drug Sample size calculations based on study comparing fludarabine and chlorambucil in previously untreated CLL patients, which suggest a 30% difference in ORR and 6-month difference in median PFS. Approx 42 patients/group needed to achieve 80% power to show a difference in ORR, assuming a two-sided level of significance of =0.05.CriteriaInclusion criteria Previously untreated patients; Age up to 75 years; Confirmed CLL diagnosis (expressed CD5, CD23 and either CD19, CD20 or both); Binet stage B or C; WHO performance status 0  2; life expectancy > 3 months Exclusion criteria Those with secondary malignancies other than cured basal cell carcinoma or cured cervical cancer were excluded; immune hemolysis or thrombocytopenia that could be treated with steroids alone; those with Richters syndrome or transformation to APML; hepatic dysfunction (bilirubin > 2 mg/dL, transaminases > 3x ULN or both), renal dysfunction (Clcr < 30 ml/min), significant medical or mental disorders, HIV infection, pregnancy/lactation, hypersensitivity to study drugs, major surgery within 30 days of start of trialResultsDates: November 2002 November 2006 319 patients: 162 bendamustine; 157 chlorambucil ITT population: 319 patients Safety population: 312 patients Demographics were well-balanced between groups Median number of treatment cycles/patient: 6 in both arms Mean number of bendamustine cycles/patient: 4.9 (SD 1.7) 54 patients (34%) needed at least one dose-reduction Mean number of chlorambucil cycles/patient: 4.9 (SD 1.7) 46 patients (31%) needed at least one dose-reduction Median observation time: 35 months (range, 1 68) Median PFS 21.6 months (bendamustine) vs. 8.3 months (chlorambucil); p< 0.001 Difference was evident in both Binet B and C groups Median duration of response 21.8 months (bendamustine) vs. 8 months (chlorambucil) Median duration of CR 29.3 months (bendamustine) Median duration of PR was 17.4 months (bendamustine) vs. 8 months (chlorambucil) Data analysis Bendamustine/stages B+C Chlorambucil/stages B+C Variable Number % Number % # patients 162 157 CR 50 31 3 2 Nodular PR 17 11 4 3 PR 43 27 41 26 ORR* 110 68 48 31 * p < 0.001 Safety 23 patients withdrew due to toxicity (18 bendamustine; 5 chlorambucil) Most frequent AE leading to DC: grade 3 hypersensitivity rxn Most common AEs were hematologic: Bendamustine: neutropenia 27%; thrombocytopenia 25%; anemia 22% Grade 3 / 4 neutropenia in 23%; growth factor given to 3% ESA given in 0.5% of all cycles Severe infections occurred in 8% Chlorambucil: neutropenia 14%; thrombocytopenia 21%; anemia 14% Grade 3 / 4 neutropenia in 11%; growth factor given to 0.3% ESA given in 0.3% of all cycles Severe infections occurred in 3% GI toxicity was greater in bendamustine arm Two reports of tumor lysis syndrome with first cycle of bendamustineConclusionsAuthors conclude that the ORR with bendamustine is comparable to that obtained with fludarabine or cladribine. PFS was significantly longer with bendamustine than chlorambucil. The toxicity of bendamustine was manageable and of short duration. In summary, bendamustine offers a significant improvement in efficacy with manageable toxicity profile.CritiqueStrengths Method of study (randomized, comparative, multicenter) Limitations Not compared to purine analog, which is considered standard of care; therapy duration of 6 months may not have been long enough to see a difference in PFS; in practice, therapy is continued for longer than 6 months CitationBergmann MA, Goebeler ME, Herold M, et al. Efficacy of Bendamustine in Patients with Relapsed or Refractory Chronic Lymphocytic Leukemia: Results of a Phase I/II Study of the German CLL Study Group. Haematologica 2005; 90: 1357Study GoalsDetermine the dose-limiting toxicity, maximum tolerated dose and the optimal therapeutic dose of bendamustine in pre-treated and treatment-refractory patients with CLL. MethodsStudy Design Phase I/II, dose-finding study Treatment arm: Starting dose bendamustine 100 mg/m2/day on days 1, 2; repeat every 3-4 weeks with reductions to 90 mg/m2/day, 80 mg/m2/day and 70 mg/m2/day; duration of therapy depended on ORR; those with PD were withdrawn from study; those with PR or SD received up to a maximum of 6 courses; those in CR after 6, courses received additional 2 courses if no severe toxicity observed. Toxicity measures: used NCI-Common Toxicity Criteria (CTC) v 2.0; non-hematologic toxicity defined as grade 3 or greater; hematologic toxicity defined as grade 4 only during cycle #1 and not caused by marrow insufficiency due to CLL Procedures: Three patients would receive each dose level. If a patient experienced a DLT, they remained on study if the toxicity completely reversed; If a DLT occurred with the first 3 patients, an additional 3 patients were accrued at that level; A second DLT terminated accrual at that level and the dose reduced by 10 mg/m2/day for the next cohort; The dose level at which one or no DLT was recorded was defined as maximum tolerated dose. Assessments: CBC plus differential checked: 8 days prior to study entry, after 3rd cycle of bendamustine and end of last course. Physical exam after each course; those in CR after any course had abdominal U/S (if enlarged LN at baseline) and bone marrow aspiration; those in CR, PR or SD had follow-up every 3 months until PD or death. Primary endpoints: define maximum tolerated dose (see above) Secondary endpoints: ORR (CR, PR, SD), duration of response Data Analysis Start of therapy to PD or death was estimated using Kaplan-Meier method.CriteriaInclusion criteria Age > 18 years; ECOG performance status < 2; life expectancy > 3 months; diagnosis of CLL based on NCI-WG guidelines; Binet stage C or stage B with active disease; received at least one prior therapy (included chlorambucil or fludarabine); refractory to prior therapy (defined as relapse < 6 months after last therapy) or have progressive or relapsed disease; fully recovered from last therapy. Exclusion criteria Severe organ dysfunction, a second malignancy or autoimmune cytopenia responsive to corticosteroid therapy; ResultsDates: enrollment from October 2000 to November 2001 N = 16 patients; median age 67 yrs (range, 57 to 83); male 75%; Binet stage C (10); Binet stage B (6); median disease duration 6 yrs (range, 0.5 11); median 3 prior treatments (chlorambucil (13), fludarabine (4), corticosteroids); ECOG PS 0 (13): PS 1 (2): PS 2 (1 patient) Maximum tolerated dose: Of a total of 16 patients, 10 were evaluable for response, duration of response and overall survival; 6 patients were withdrawn from study due to toxicity (they could not complete 3 courses of therapy); 100 mg/m2: one patient, resistant to chlorambucil, recd 3 courses; achieved PR; ongoing for 42.7+ months 90 mg/m2: one patient, resistant to chlorambucil, achieved SD; after 9 months PD, retreated with bendamustine; died after 45.6 months from PD 80 mg/m2: one patient, after 4 prior treatments, withdrew per his wishes; achieved CR; duration of CR 41 months 70 mg/m2: six patients achieved responses: PR (4); SD (1); CR (1); duration of responses varied from 7 to 43.6 monthsConclusionsAuthors conclude that bendamustine is effective in heavily pre-treated CLL patients, even at reduced doses; the optimal therapeutic dose in refractory CLL be 70 mg/m2/day on days 1, 2 every 4 weeks as this had an acceptable toxicity profile and should be the dose recommended for future studies.CritiqueStrengths Evaluates use of bendamustine in a pre-treated aged population with concomitant comorbidities Limitations Small study sample; one patient included that was not resistant to fludarabine or chlorambucil had long duration of response (45 months) question eligibility; eleven patients had significant concomitant diseases noted at baseline some grade 3 CRI, grade 3 HTN, afib, arrhythmia; grade 4 hematologic toxicity question eligibility; no notation if growth factors were used Table 2. Clinical Trials in NHL CitationFriedberg JW, Cohen P, Chen L, et al. Bendamustine in Patients with Rituximab-Refractory Indolent and Transformed Non-Hodgkins Lymphoma: Results from a Phase II Multicenter, Single-Agent Study. J Clin Oncol 2008; 26: 204 210.Study GoalsEvaluate use of bendamustine in patients with rituximab-refractory indolent or transformed NHLMethodsStudy Design Phase II, multicenter, single-agent trial Arm: bendamustine 120 mg/m2/day IV on days 1, 2 every 3 weeks Efficacy measures: CR, uCR, PR Assessment: performed at 3-month intervals Primary endpoints: overall RR (ORR) Secondary endpoints: safety, PFS, duration of response Primary prophylactic use of growth factors not permitted; Concurrent filgrastim/pegfilgrastim permitted if grade 4 neutropenia lasting > 1 wk, poor WBC recovery by next dose, or febrile neutropenia episode. Data Analysis Sample size determined using two-stage methodology of Simon; assumes therapy is promising if ORR > 35% and not worthy of pursuing if ORR < 20%. If > 6 responses noted, enrollment of > 72 was needed. Primary analysis performed on all patients receiving any amount of bendamustine (n = 76). Median duration of response and PFS assessed using Kaplan-Meier method.CriteriaInclusion criteria Age > 18 years; WHO performance status < 2; diagnoses of indolent NHL (including follicular, SLL, lymphoplasmacytoid, marginal cell) or indolent disease transformed to aggressive subtype; received prior rituximab therapy (alone or in combo) and considered refractory (defined as no response or PD within 6 months) or intolerant; maximum of 3 prior unique chemo regimens including ASCT were permitted baseline ANC > 1000; platelets > 100,000; adequate hepatic/renal function. Exclusion criteria Prior chemo/immune therapy within 3 wks prior to study; failure to recover from AEs; investigational agent within 28 days; WBC growth factor within 14 days; therapeutic doses of systemic steroids; allogeneic transplant; concurrent active malignancy (except nonmelanoma skin cancer, in situ cervical or bladder cancer); CNS lymphoma; serious infection or other medical/psychiatric condition that may interfere with study objectives; pregnancy/lactation; expected survival < 3 months.ResultsDates: September 2003 February 2005 N = 76 patients enrolled in 14 institutions; median age 63 yrs (range, 38 to 84) Indolent B-cell NHL (total 61:46 follicular; 12 SLL; 1 lymphoplasmacytoid;2 marginal zone; 15 transformed) Among transformed: mean 22.7 +/- 21.4 months elapsed since transformation; Among follicular histologies, FLIPI categorization: low 26%; intermediate 30%; high 33%; Median 2 prior therapies (range, 1 5); Median 5 cycles of bendamustine (range, 1 9) completed 34 patients (44%) received at least 6 cycles 43 patients (56%) discontinued b/c of AEs (n = 23); PD (n = 14); or patient/PI decision (n = 6); Thrombocytopenia was most common reason for early DC. Median duration of response was 6.7 months (95% CI, 5.1 9.9); Indolent lymphoma, 9 months (95% CI, 5.9 16.7); Transformed disease, 2.3 months (95% CI, 1.7 5.1) Median follow-up 26 months; PFS 7.1 months (95% CI, 6.02 8.91) Indolent lymphoma, 8.3 months (95% CI, 6.6 10.9) Transformed disease, 4.2 months (95% CI, 2.7 5.1) Alkylator-refractory patients (n = 23), ORR 61% Fludarabine-refractory patients (n =8), ORR 62% Data Analysis Treatment response (%) Response # patients* CR/Cru PR PD Total 74 34 43 17 Follicular 45 37 44 11 SLL 11 36 27 36 Lymphoplasmacytic 1 100 0 0 Marginal zone 2 50 50 0 Transformed 15 13 53 27 * 2 patients were excluded from efficacy analysis due to lack of measurable disease Safety 19 patients required a dose-reduction; 15 were reduced to 90 mg/m2; 4 were additionally reduced to 60 mg/m2 Most common AEs were hematologic: Neutropenia 85% (grade 3 30%; grade 4 24%); 5 episodes of FN documented; Anemia 94% (grade 3 12%) Thrombocytopenia 85% (grade 3 16%; grade 4 9%) Non-hematologic toxicities were primarily grade 1 / 2; Nausea 72% (grade 3 4%) Fatigue 49% (grade 3 7%) Vomiting 41% (grade 3 4) Secondary malignancies developed in 3 patients: all eventually died; Infusion-related reactions occurred in 7 patients; 3 discontinued therapy due to rxn ConclusionsBendamustine produced durable objective responses with acceptable toxicity in heavily pretreated patients with rituximab-refractory, indolent NHL.CritiqueStrengths Results were stratified by prior therapy (ie. alkylator-refractory, fludarabine-refractory) Limitations Not a comparative trial; ~50% female population studied; data on the actual use of WBC growth factors was not provided Table 2. Clinical Trials in NHL CitationKahl BS, Bartlett NL, Leonard JP, et al. Bendamustine is Effective Therapy in Patients with Rituximab-Refractory, Indolent B-cell Non-Hodgkin Lymphoma. Cancer 2009; DOI: 10.1002/cncr.24714,www.interscience.wiley.comStudy GoalsFurther evaluate the effects of bendamustine in a larger group of patients with rituximab-refractory, indolent B-cell lymphomaMethodsStudy Design Multicenter (U.S. and Canada), Open-Label, Single-Arm design trial Primary endpoints: ORR, duration of response Secondary endpoints: PFS, safety profile Arm: bendamustine 120 mg/m2/day IV on days 1, 2 every 3 weeks for 6 8 cycles Efficacy measures: CR, uCR, PR Assessment: performed at wk 6, 12 and every 3-months thereafter Primary endpoints: overall RR (ORR) Secondary endpoints: safety, PFS, duration of response Primary prophylactic use of growth factors not permitted; Concurrent filgrastim/pegfilgrastim permitted if grade 4 neutropenia lasting > 1 wk, poor WBC recovery by next dose, or febrile neutropenia episode. Data Analysis Primary analysis performed on all patients receiving any amount of bendamustine; Patients were classified according to their best response at completion of therapy; Response assessments made by PI and IRC; Median duration of response and PFS assessed using Kaplan-Meier method.CriteriaInclusion criteria Age > 18 years; WHO performance status < 2; diagnoses of indolent NHL (including follicular, SLL, lymphoplasmacytoid, marginal cell) or indolent disease transformed to aggressive subtype; received prior rituximab therapy (alone or in combo) and considered refractory (defined as no response or PD within 6 months) or intolerant; maximum of 3 prior unique chemo regimens including ASCT were permitted baseline ANC > 1000; platelets > 100,000 (or > 75,000 if due to NHL marrow involvement); adequate hepatic/renal function; bidimensionally measurable disease Exclusion criteria Prior chemo/immune therapy within 3 wks prior to study; failure to recover from AEs; investigational agent within 28 days; WBC growth factor within 14 days; therapeutic doses of systemic steroids; allogeneic transplant; concurrent active malignancy (except nonmelanoma skin cancer, in situ cervical or bladder cancer); CNS lymphoma; serious infection or other medical/psychiatric condition that may interfere with study objectives; pregnancy/lactation; expected survival < 3 months.ResultsDates: October 2005 July 2007 N = 100 patients enrolled in 28 institutions; median age 60 yrs (range, 31 to 84); Histologies: follicular NHL (63); SLL (21); lymphoplasmacytoid (1); marginal zone (16); Among follicular histologies, FLIPI categorization: low 29%; intermediate 42%; high 29%; Median 2 (range, 0 6) prior therapies: Prior therapies include (%): single-agent rituximab (1), alkylator-based (75); purine-based (44); XRT (44) Median 6 cycles completed (range, 1 8) 60 patients (60%) received at least 6 cycles 40 patients (40%) discontinued early: b/c of AEs (n=27); PD (n=10); patient choice (n=1); BMT referral (n=1); excessive treatment delay (n=1) ORR 75% (95% CI, 65 83%) ORR by follicular histology: low (72%); intermediate (77%); high (72%) Mean duration of response 9.2 months (7.1-10.8) Chemosensitive 10 months (8.4 11.7) Chemorefractory 6.3 months (4.9 NA) Alkylator sensitive 9.7 months (8.3 11.7) Alkylator refractory 7.7 months (4.9 NA) Data analysis Histology (#) ORR CR Cru PR SD PD Follicular (n=62) 74 15 5 55 15 10 SLL (n=21) 71 5 0 67 19 5 Lymphoplasmacytic (n=1) 100 0 0 100 0 0 LN Marginal zone (n=9) 78 11 0 67 22 0 ExtraLN marginal zone (n=7) 86 43 0 43 14 0 Total (n=100) 75* 14 3 58 16 7 * (95% CI, 65 83%) Safety 24 patients (25%) had dose-reductions b/c of AEs 20% reduced from 120 to 90 mg/m2; 4% further reduced to 60 mg/m2 68 patients (68%) had dose-reduction or delay or did not receive both doses/cycle Neutropenia and thrombocytopenia were most common reasons for reductions/delays Mean relative dose intensity was 88% Most common AEs were hematologic: Neutropenia 83% (grade 3 38%; grade 4 23%); febrile neutropenia 6% (grade 3 5%; grade 4 1%) 38% received filgrastim/pegfilgrastim Anemia 94% (grade 3 7%) Thrombocytopenia 88% (grade 3 19%; grade 4 6%) Non-hematologic toxicities were primarily grade 1 / 2; Nausea 77% (grade 3 4%) Infection 69% (grade 3 15%; grade 4 6%) Fatigue 64% (grade 3 12%) Vomiting 40% (grade 3 2%) Secondary malignancies developed in 2 patients: Infusion-related reactions occurred in 12 patients; 2 discontinued therapy due to rxn Tumor lysis syndrome noted in 2 patients, which resolved with supportive careConclusionsBendamustine demonstrated encouraging efficacy in this heavily pretreated population. Some of the infections observed suggest a degree of immune suppression greater than what is normally expected; authors recommend a low threshold for testing individuals who develop signs/symptoms comparable with CMV reactivation. Bendamustine has promising activity with acceptable toxicity; a valuable addition to treatment armamentarium for this patient population.CritiqueStrengths Multicenter trial; included heavily pretreated patients; stratified prior therapy to see if there was any difference in responses; WBC growth factor use provided Limitations Not comparative data; small population; women made up 35% of population CitationRobinson SK, Williams ME, va der Jagt RH, et al. Phase II Multicenter Study of Bendamustine Plus Rituximab in Patients with Relapsed Indolent B-cell and Mantle Cell Non-Hodgkins Lymphoma. J Clin Oncol 2008; 26: 4473.Study GoalsEvaluate safety and efficacy of bendamustine plus rituximab in patients with indolent B-cell or mantle cell lymphoma at time of relapse. MethodsStudy Design Phase II, multicenter, open-label, single-arm trial Treatment arm: Rituximab 375 mg/m2 IV on day 1 Bendamustine 90 mg/m2/day IV on days 2, 3 every 28 days x 4 cycles Efficacy measures: CR, uCR, PR, SD, PR Assessment: after 2nd cycle, within 8 weeks of last rituximab dose, then at 3-month intervals x 2 yrs Primary endpoints: overall RR (ORR) Secondary endpoints: safety, PFS, duration of response Primary prophylactic use of growth factors not permitted; Concurrent growth factors were permitted if grade 4 neutropenia lasting > 1 wk, poor WBC recovery by next dose, or febrile neutropenia episode. Data Analysis Sample size of 60 subjects was planned to yield more than 80% power to detect an increase of 20% in ORR after treatment with bendamustine plus rituximab; Kaplan-Meier method used to estimate median DR, PFS.CriteriaInclusion criteria Age > 18 years; WHO performance status < 2; documented relapsed, CD20-positive mantle cell NHL or indolent B-cell NHL (follicular, SLL, lymphoplasmacytic or marginal zone); bidimensionally measurable disease; maximum of 3 prior, unique chemotherapy regimens; prior rituximab allowed if patient was not refractory; adequate hematologic function with baseline ANC > 1000; platelets > 100,000, unless > 50% marrow involvement; adequate renal (Clcr > 30 ml/min); adequate hepatic (AST, ALT < 2.5 x ULN; tbili < 1.5 x ULN) Exclusion criteria If refractory to rituximab, received prior radioimmunotherapy or prior high-dose chemotherapy with allogeneic stem-cell support; concurrent treatment with corticosteroids; active malignancy other than lymphoma, malignant effusions; serious infection; not yet recovered from prior adverse effectsResultsDates: April 2004 to December 2005 N = 67 patients enrolled in 22 institutions; median age 60 yrs (range, 40 to 84); male 59% Received prior rituximab 56%; rituximab-nave 44% Median 1 prior chemotherapy regimen (range, 1 4) Indolent B-cell NHL (total 54: 40 follicular; 10 SLL; 2 lymphoplasmacytic; 2 marginal zone); mantle cell 12; Among follicular histologies, FLIPI categorization: low 33%; intermediate 33%; high 33%; Median 6 cycles(range, 2 7) completed 61 patients (92%) completed > 4 cycles 41 patients (62%) received 6 cycles Median follow-up time 20 months (range, 19 22) Median DR for indolent NHL 21 months (95% CI, 18 24 months) Median PFS 23 months (95% CI, 20 26 months) Median DR for mantle cell NHL 19 months (95% CI, 12 24 months) Data Analysis Treatment response (%) Response # patients ORR CR/CRu PR SD PD Total 66 92 41/14 38 8 17 Indolent NHL 54 93 41/13 39 7 11 Mantle cell NHL 12 92 42/17 33 8 36 Rituximab Prior rituximab 37 87 35/14 38 14 0 No prior rituximab 29 100 48/14 38 0 27 Safety Mean relative dose-intensity for bendamustine 93%; rituximab 95% 6 patients discontinued therapy early due to: AE (n = 2), PD (n = 1), choice (n = 2), lost follow up (n = 1) Most common AEs were hematologic: Neutropenia 79% (grade 3 23%; grade 4 14%); Febrile neutropenia 6% (grade 3 5%; grade 4 2%) 12% received WBC growth factors Anemia 77% (grade 3 2%) 15% received RBC growth factors or transfusion Thrombocytopenia 62% (grade 3 8%; grade 4 2%) 6% received platelet transfusions, plasma or other blood products Non-hematologic toxicities were primarily grade 1 / 2; Nausea 70% Infection 64% (grade 3 8%; grade 4 2%) Fatigue 59% (grade 3 5%) Infusion-related reactions with bendamustine 10 (15%) and rituximab 13 (20%); 5 deaths reported: PD (n = 3); compartment syndrome/pulm edema (n = 1); TEN (n = 1)ConclusionsResults are consistent with previous German study; efficacy outcomes in relapsed mantle cell patients encouraging and compare to results with R-FCM regimen; toxicity manageable; lacks alopecia; combination represents an effective and tolerable treatment for relapsed indolent and mantle cell NHLCritiqueStrengths Results were stratified by prior therapy (ie. alkylator-refractory, fludarabine-refractory); use of supportive therapy provided (ESAs, growth factors, transfusions) Limitations Not a comparative trial; ~50% female population studied; small population studied CitationRummel MJ, Niederle N, Maschmeyer G, et al. Bendamustine Plus Rituximab is Superior in Respect of PFS and CR Rate when Compared to CHOP Plus Rituximab as First-Line Treatment of Patients with Advanced Follicular, Indolent and Mantle Cell Lymphomas: Final Results of a Randomized Phase III Study of the StiL (Study Group Indolent Lymphomas, Germany). Annual ASH Proc 2009; abstract 405Study GoalsFurther evaluate the role of bendamustine plus rituximab as first-line treatment of indolent and mantle cell lymphomas in a phase III fashion.MethodsStudy Design Phase III, comparative trial Treatment arms: Rituximab 375 mg/m2 IV on day 1 Bendamustine 90 mg/m2/day IV on days 2, 3 every 28 days x 6 cycles OR Rituximab 375 mg/n2 IV on day 1 CHOP (cyclophosphamide, doxorubicin, vincristine, prednisone) x 6 cycles Efficacy measures: CR, uCR, PR, SD, PR Assessment: not known Primary endpoints: PFS Primary prophylactic use of growth factors and antibiotics were not permitted; Data Analysis Not knownCriteriaInclusion criteria/ Exclusion criteria Not knownResultsN = 549 patients; 513 evaluable (260 BR; 253 CHOP-R); median age 64 yrs (range, 31 to 83); Characteristics similar between both groups; Most patients were stage IV (76% BR; 77% CHOP-R); stage III (19% BR, 18% CHOP-R); Histology: follicular (55% BR; 56% CHOP-R); mantle cell (18% BR; 19% CHOP-R); Median 6 cycles given in both treatment arms (82% BR; 86% CHOP-R) Median observation time 32 months ORR similar (93.8% BR; 93.5% CHOP-R) Data .06:[bdef|? 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