Treatment of Adults With Acute Lymphoblastic Leukemia: Do the Specifics of the Regimen Matter?
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1 Treatment of Adults With Acute Lymphoblastic Leukemia: Do the Specifics of the Regimen Matter? Results From a Prospective Randomized Trial Nicole Lamanna, MD 1 ; Leonard T. Heffner, MD 2 ; Matt Kalaycio, MD 3 ; Gary Schiller, MD 4 ; Steven Coutre, MD 5 ; Joseph Moore, MD 6 ; Karen Seiter, MD 7 ; Peter Maslak, MD 1 ; Katherine Panageas, PhD 1 ; David Golde, MD 1y ; and Mark A. Weiss, MD 8 BACKGROUND: Induction therapy for adults with acute lymphoblastic leukemia (ALL) is similar across essentially all regimens, comprised of vincristine, corticosteroids, and anthracyclines intensified with cyclophosphamide, asparaginase, or both. Given the lack of randomized data, to date, no regimen has emerged as standard. The authors previously evaluated cytarabine 3 g/m 2 daily for 5 days with mitoxantrone 80 mg/m 2 (the ALL-2 regimen) as a novel induction regimen. Compared with historic controls, the ALL-2 regimen was superior in terms of incidence of complete remission, failure with resistant disease, and activity in patients with Philadelphia chromosome (Ph)-positive ALL. METHODS: The authors conducted a multicenter, prospective, randomized trial of the ALL-2 regimen compared with a standard 4-drug induction (the L-20 regimen). Patients also received consolidation, maintenance therapy, and central nervous system prophylaxis. The trial accrued patients from August 1996 to October RESULTS: The median follow-up for survivors was 7 years, and the median patient age was 43 years. Responses were evaluated in 164 patients. The treatment arms were balanced in terms of pretreatment characteristics. The frequency of complete remission for the ALL-2 regimen versus the L-20 regimen was 83% versus 71% (P ¼.06). More patients on the L-20 arm failed with resistant disease (21% vs 8%; P ¼.02). Induction deaths were comparable at 9% (ALL-2) versus 7% (L-20). The median survival was similar; and, at 5 years, the survival rate was 33% alive on the ALL-2 arm versus 27% on the L-20. CONCLUSIONS: Despite superior results of induction therapy with the ALL-2 regimen, this treatment did not improve long-term outcomes. When coupled to the reported experience of other studies in adults with ALL, the results of this randomized trial raise the possibility that ultimate outcomes in adult ALL may be independent of the specific regimen chosen. Cancer 2013;119: VC 2012 American Cancer Society. KEYWORDS: acute lymphocytic leukemia, mitoxantrone, cytarabine, anthracycline, T cell. INTRODUCTION Therapy for adult patients with acute lymphoblastic leukemia (ALL) can be broadly classified as including induction, consolidation, maintenance, and central nervous system prophylaxis. Despite marked improvement in the outcomes for pediatric patients with ALL, the same success has not been realized for adult patients. Current regimens induce a complete response/complete remission (CR) in approximately 60% to 90% of patients. However, there is a substantial relapse rate, and only 20% to 40% of patients ultimately will be cured of their disease. 1-8 Multiple studies have confirmed the importance of several prognostic features, including age, immunophenotype, white blood cell (WBC) count, cytogenetic abnormalities, and the time to achieve a CR. 9,10 On the basis of these observations, several groups have tested more aggressive acute myeloid leukemia (AML)-style induction therapies to induce more rapid CRs and, in this manner, attempt to increase the likelihood of a cure Previously, we conducted a phase 2 study of AML-style therapy, the ALL-2 regimen, which combined high-dose cytarabine with a very high single dose of mitoxantrone (80 mg/m 2 ). In that study, patients did not receive vincristine or steroids during induction therapy. The initial choice of high-dose mitoxantrone came from preclinical trials that demonstrated a steep dose-response curve for mitoxantrone when tested in vitro against leukemic blasts. 14 This was then bolstered by a phase 1 clinical and pharmacologic evaluation. 15 On the basis of the preclinical and phase 1 trial data, we tested this ALL-2 regimen in adult patients with ALL. Corresponding author: Mark A. Weiss, MD, Thomas Jefferson University, 834 Chestnut Street, Suite 320, Philadelphia, PA 19107; Fax: (215) ; mark. weiss@jefferson.edu 1 Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York; 2 Department of Hematology/Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, Georgia; 3 Department of Hematologic Oncology and Blood Disorders, Taussig Cancer Center, Cleveland Clinic, Cleveland, Ohio; 4 Department of Medicine, University of California-Los Angeles School of Medicine, Los Angeles, California; 5 Department of Medicine, Stanford University, Palo Alto, California; 6 Department of Medicine, Duke University Medical Center, Durham, North Carolina; 7 Department of Medicine, New York Medical College, Valhalla, New York; 8 Department of Medical Oncology, Jefferson Medical College, Philadelphia, Pennsylvania y Deceased. DOI: /cncr.27901, Received: June 22, 2012; Revised: September 4, 2012; Accepted: September 20, 2012, Published online December 20, 2012 in Wiley Online Library (wileyonlinelibrary.com) 1186 Cancer March 15, 2013
2 Treatment of Adults With ALL/Lamanna et al TABLE 1. The ALL-2 Induction Regimen With High- Dose Mitoxantrone and Cytarabine Drug a Cytarabine Mitoxantrone GM-CSF b IT methotrexate Abbreviations: GM-CSF, granulocyte-macrophage colony stimulating factor; IT, intrathecal. a Dose information for the ALL-2 induction regimen: intravenous (IV) cytarabine 3 g/m 2 once daily over 3 hours, mitoxantrone 80 mg/m 2, subcutaneous GM-CSF 250 lg/m 2 once daily, allopurinol 300 mg 3 times daily for 7 days before starting chemotherapy, dexamethasone 0.1% eye drops every 6 hours while receiving cytarabine, and IT methotrexate 6 mg/m 2 (maximum, 15 mg) on days 2 and 4. b Patients continued receiving GM-CSF until they sustained an absolute neutrophil count > /L for 2 days. When the results of this regimen were compared with a historic control group (patients who were treated on the last Memorial Hospital vincristine/prednisonebased regimen [ L-20 ]), we observed several differences. The incidence of CR (84% vs 67% for the ALL-2 regimen vs the L-20 regimen, respectively; P ¼.056) and the time to CR (34 days vs 61 days, respectively; P ¼.005) were superior on the ALL-2 regimen. ALL-2 also appeared to be superior in patients who had Philadelphia chromosome (Ph)-positive ALL, with improved incidence of complete hematologic response (100% vs 61%; P ¼.14) and complete cytogenetic response (100% vs 45%; P ¼.056). The survival curves for patients with Ph-positive disease also suggested a benefit for the patients who received ALL-2 (median not reached: >12 months vs 8.8 months; P ¼.052). These results suggested that the ALL-2 regimen may be a superior form of induction therapy for adult patients with ALL; and, given the limitations inherent in comparisons with historic controls, we conducted a prospective randomized trial of the ALL-2 regimen versus the L-20 program. MATERIALS AND METHODS The patients who participated had previously untreated ALL or lymphoblastic lymphoma. Patients were required to have adequate hepatic, renal, and cardiac function. All patients gave their written informed consent. The participating centers were Memorial Sloan-Kettering Cancer Center, Emory University, The Cleveland Clinic Foundation, University of California-Los Angeles, Duke University Medical Center, New York Medical College, and Stanford University Medical Center. This study was TABLE 2. ALL-2 Regimen: Consolidation A Drug a Vincristine IT methotrexate Prednisone Abbreviations: IT, intrathecal. a Dose information for ALL-2 Consolidation A: intravenous vincristine 2 mg/ m 2 (maximum, 4 mg; patients aged >60 years received a maximum of 2.5 mg); prednisone 60 mg/m 2 daily on days 1 through 30, then tapered over 10 days; sulfamethoxazole/trimethoprim 1 double-strength tablet (800 mg sulfamethoxazole and 160 mg trimethoprim ) twice daily 3 times a week on days 1 through 30, then twice daily on days 31 through 47; and IT methotrexate 6 mg/m 2 (maximum, 15 mg) on days 8, 15, 22, and 29. TABLE 3. ALL-2 Regimen: Consolidation B Drug a Cyclophosphamide GM-CSF b Abbreviations: GM-CSF, granulocyte-macrophage colony stimulating factor. a Dose information for ALL-2 Consolidation B: intravenous cyclophosphamide 4 g/m 2 (patients aged >60 years received 3 g/m 2 ) and subcutaneous GM-CSF 250 lg/m 2 daily. b Patients continued receiving GM-CSF until they sustained an absolute neutrophil count > /L for 2 days. reviewed and approved by the institutional review boards at all participating institutions. Treatment Arms Patients were randomized to treatment on either the ALL- 2 or L-20 treatment regimen. The ALL-2 regimen was comprised of induction with cytarabine and high-dose mitoxantrone followed by 4 cycles of consolidation as follows: Consolidation A with vincristine and prednisone, Consolidation B with high-dose cyclophosphamide, Consolidation C with etoposide and cytarabine, and Consolidation D with pegaspargase (if unavailable, then substitution with L-asparaginase was permitted). Maintenance therapy was administered for 2 years as previously described (Tables 1 through 7). The L-20 regimen was comprised of induction with vincristine, prednisone, cyclophosphamide, and doxorubicin followed by 4 cycles of consolidation as follows: Consolidation A with cytarabine and daunorubicin, Consolidation B with cytarabine and methotrexate, Consolidation C with pegaspargase (if unavailable, then substitution with L-asparaginase was permitted), and Consolidation D with cyclophosphamide (Tables 8 through 12). Maintenance therapy was the same as the ALL-2 schedule (Tables 6 and 7). Cancer March 15,
3 Allogeneic stem cell transplantation in first remission was only permitted for patients with Ph-positive disease and a t(4;11) translocation. Such patients typically underwent transplantation after Consolidation A. Evaluation Criteria Responses were graded as complete if there was disappearance of all clinical evidence of leukemia for a minimum of 4 weeks. The patient had to have a neutrophil count > /L, a platelet count >100, /L, no circulating blasts, and 5% blasts on bone marrow TABLE 4. ALL-2 Regimen: Consolidation C Drug a Cytarabine Etoposide GM-CSF IT methotrexate Abbreviations: GM-CSF, granulocyte-macrophage colony stimulating factor; IT, intrathecal. a Dose information for ALL-2 Consolidation C: intravenous (IV) cytarabine 25 mg/m 2 as an IV bolus, then 200 mg/m 2 daily as a continuous IV infusion; IV etoposide 200 mg/m 2 daily; subcutaneous GM-CSF 250 lg/m 2 daily until patients sustained an absolute neutrophil count > /L for 2 days; and IT methotrexate 6 mg/m 2 (maximum, 15 mg) on days 2 and 4. TABLE 5. ALL-2 Regimen: Consolidation D Drug a 1 Pegaspargase b a Dose information for ALL-2 Consolidation D: intramuscular (IM) or intravenous (IV) pegaspargase 2000 IU/m 2 daily on day 1 (maximum dose, 3750 IU [1 vial]; patients aged >60 years received 1000 IU/m 2 ). b If Pegaspargase is unavailable, then L-asparaginase should be substituted (IM or IV L-asparaginase 10,000 IU/m 2 daily 3 times a week for a total of 6 doses; patients aged >60 years receive 6000 IU/m 2 ). differential in a normal or hypercellular bone marrow. In contrast to many studies, we required 2 remission bone marrows performed at least 28 days apart. Studies of minimal residual disease using flow cytometric or molecular tests were not required. Treatment failure included increasing bone marrow infiltrate or the development of organ failure or extramedullary infiltrates because of leukemia. Patients had to achieve a complete bone marrow response by the end of Consolidation A. Partial responses at the end of Consolidation A were considered treatment failures, and those patients were removed from study. Toxicity Toxicities were evaluated according to National Cancer Institute Common Toxicity Criteria. Statistical Design and Methods: Sample Size The primary endpoint for this trial was a comparison of the frequency of response between the 2 arms. The secondary endpoints comparisons of the time to CR, the length of hospital stay, efficacy in Ph-positive ALL, and the fraction of patients achieving durable (>5-year) responses. The study was designed to detect a 20% improvement in the probability of CR from 67% to 87% using a sequential design. The target accrual was 77 evaluable patients per arm to detect this difference with a power of at least 80%, and the O Brien and Fleming stopping rule was used to maintain an overall significance level of 5%. The sequence of nominal significance levels used was P ¼.0005, P ¼.0124, and P ¼.0455 for the interim and final analyses, respectively. Randomization was accomplished by the method of random permuted block with treating institution as a stratification factor. TABLE 6. ALL-2 Regimen: Maintenance Sequence 1 Drug a Vincristine Prednisone Doxorubicin b Mercaptopurine Methotrexate IT methotrexate Dactinomycin Abbreviations: IT, intrathecal. a Dose information for ALL-2 Maintenance Sequence 1: intravenous (IV) vincristine 2 mg/m 2 (maximum, 4 mg; patients aged >60 years received 1 mg/m 2 up to a maximum of 2 mg); prednisone 50 mg/m 2 daily on days 1 through 8; doxorubicin 60 mg/m 2 on day 15 (check left ventricular function before prescribing); oral mercaptopurine 90 mg/m 2 daily on days 36 through 64; oral methotrexate 15 mg/m 2 daily (maximum, 25 mg) on days 39, 46, 53, and 60; IT methotrexate 6 mg/m 2 (maximum, 15 mg) on days 36 and 43; and IV dactinomycin 1 mg/m 2 on day 85. b The ejection fraction was measured before each dose of doxorubicin. Patients who had a decline in their ejection fraction had cyclophosphamide and carmustine substituted for the day-15 doxorubicin Cancer March 15, 2013
4 Treatment of Adults With ALL/Lamanna et al TABLE 7. ALL-2 Regimen: Maintenance Sequence 2 Drug a Vincristine Prednisone Cyclophosphamide BCNU Mercaptopurine Methotrexate IT methotrexate Dactinomycin Abbreviations: BCNU, carmustine; IT, intrathecal. a Dose information ALL-2 Maintenance Sequence 2: intravenous (IV) vincristine 2 mg/m 2 (maximum, 4 mg; patients aged >60 years received 1 mg/m 2 up to a maximum of 2 mg) on days 1 and 8; prednisone 50 mg/m 2 daily on days 1 through 8; IV cyclophosphamide 800 mg/m 2 on day 15; IV BCNU 80 mg/m 2 on day 15; oral mercaptopurine 90 mg/m 2 daily on days 36 through 64; oral methotrexate 15 mg/m 2 daily (maximum, 25 mg) on days 39, 46, 53, and 60; IT methotrexate 6 mg/m 2 (maximum, 15 mg) on days 36 and 43; and IV dactinomycin 1 mg/m 2 on day 85. TABLE 8. L-20 Induction Regimen Drug a Vincristine Prednisone Taper Cyclophosphamide Doxorubicin GM-CSF b IT methotrexate Abbreviations: GM-CSF, granulocyte-macrophage colony stimulating factor; IT, intrathecal. a Dose information for the L-20 induction regimen: intravenous (IV) vincristine 2 mg/m 2 on days 1, 8, 15, 22, and 29 (maximum, 4 mg; patients aged >60 years received 1 mg/m 2 up to a maximum of 2 mg); prednisone 20 mg/m 2 daily on days 1 through 29 with a 10-day taper; IV cyclophosphamide 1 g/m 2 on day 5 and 600 mg/m 2 on day 42; IV doxorubicin 20 mg/m 2 on days 23, 24, and 25 and 30 mg/m 2 on day 42; subcutaneous GM-CSF 250 lg/m 2 daily; IT methotrexate 6 mg/m 2 (maximum, 15 mg) on days 3, 5, 13, 16, 32, and 34; allopurinol 300 mg 3 times daily for 7 days starting prechemotherapy; and sulfamethoxazole/ trimethoprim 1 double-strength tablet (800 mg sulfamethoxazole and 160 mg trimethoprim ) twice daily 3 times a week on days 1 through 20, then twice daily on days 30 through 46. b Patients continued receiving GM-CSF until they sustained an absolute neutrophil count > /L for 2 days. TABLE 9. L-20 Regimen: Consolidation A Drug a Cytarabine Daunorubicin GM-CSF b IT methotrexate Abbreviations: GM-CSF, granulocyte-macrophage colony stimulating factor; IT, intrathecal. a Dose information for L-20 Consolidation A: cytarabine 25 mg/m 2 as an intravenous (IV) bolus then 200 mg/m 2 daily as a continuous IV infusion on days 1 through 5; IV daunorubicin 50 mg/m 2 daily on days 1 through 3; subcutaneous GM-CSF 250 lg/m 2 daily; and IT methotrexate 6 mg/m 2 (maximum, 15 mg) on days 2 and 4. b Patients continued receiving GM-CSF until they sustained an absolute neutrophil count > /L for 2 days. Statistical Analysis The frequency of the primary outcome (CR) was reported for each treatment arm. The proportion of CR for the 2 arms was compared using the Fisher exact test. Kaplan- TABLE 10. L-20 Regimen: Consolidation B Drug a Cytarabine Methotrexate GM-CSF b IT methotrexate Abbreviations: GM-CSF, granulocyte-macrophage colony stimulating factor; IT, intrathecal. a Dose information for L-20 Consolidation B: cytarabine 25 mg/m 2 as an intravenous (IV) bolus then 200 mg/m 2 daily as a continuous IV infusion on days 1 through 4; IV methotrexate 15 mg/m 2 daily (maximum, 25 mg daily) on days 1 through 4; subcutaneous GM-CSF 250 lg/m 2 daily; and IT methotrexate 6 mg/m 2 (maximum, 15 mg) on days 2 and 4. b Patients continued receiving GM-CSF until they sustained an absolute neutrophil count > /L for 2 days. Meier estimates also were computed for overall survival and duration of CR. Overall survival was defined as the time from randomization to death from any cause. Duration of CR was measured from the initial CR until Cancer March 15,
5 TABLE 11. L-20 Regimen: Consolidation C Drug a 1 Pegaspargase b a Dose information for L-20 Consolidation C: intramuscular (IM) or intravenous (IV) pegaspargase 2000 IU/m 2 on day 1 (maximum dose, 3750 IU [1 vial]; patients aged >60 years received 1000 IU/m 2 ). b If Pegaspargase is unavailable, then L-asparaginase should be substituted (IM or IV L-asparaginase 10,000 IU/m 2 daily 3 times a week for a total of 6 doses; patients aged >60 years received 6000 IU/m 2 ). TABLE 12. L-20 Regimen: Consolidation D a Drug 1 Cyclophosphamide a Dose information for L-20 Consolidation D: intravenous cyclophosphamide 1.2 g/m 2. progression of disease. Subgroup comparisons of overall and disease-free survival were performed using the logrank test. Analyses were performed using both the intentto-treat principle, which included all registered patients (eligible and ineligible), and all evaluable patients. Frequency of toxicities was reported based on National Cancer Institute Common Toxicity Criteria. The secondary endpoints comparing the 2 regimens were the time to CR, hospital days, and efficacy in Ph-positive ALL. All analyses were carried out using SAS version 9.2 (SAS Institute, Cary, NC). Data Safety Monitoring Board The data were reviewed at designated intervals by an independent Data and Safety Monitoring Committee. Members of the data safety monitoring board were provided tables of accrual and the frequencies of toxicity and adverse events for review. Interim analyses were performed at intervals of 1 year. RESULTS Patient Characteristics One hundred seventy-one patients were registered between August 1996 and October 2004, 164 patients were evaluable for response, and 7 patients were inevaluable for response, including 3 patients who had major protocol violations, 3 patients who were registered but withdrew consent or transferred their care before initiating chemotherapy, and 1 patient who was removed before initiating therapy for misdiagnosis. The median followup among survivors was 7 years. Seventy-eight patients received induction with the ALL-regimen, and 86 patients received the L-20 regimen. The median age of evaluable patients was 43 years (range, years), 62% were TABLE 13. Comparison of the ALL-2 and L-20 Treatment Arms: Patient Characteristics Variable ALL-2 Arm, N ¼ 78 L-20 Arm, N ¼ 86 Women, % Age: Median [range], y 43 [19-77] 43 [22-78] WBC: Mean, 10 9 /L Phþ ALL: No. of patients (%) 14 (18) 15 (17) T-lineage disease, % Enrollment by site: No. of patients MSKCC Emory Cleveland Clinic UCLA 8 12 Duke 8 9 Westchester 6 9 Stanford 3 4 Abbreviations: ALL, acute lymphoblastic leukemia; ALL-2, the acute lymphoblastic leukemia regimen (see Table 1); Duke, Duke University Medical Center; Emory, Emory University; L-20, the standard 4-drug induction regimen (see Table 8); MSKCC, Memorial Sloan-Kettering Cancer Center; Phþ, Philadelphia chromosome-positive; Stanford, Stanford University; UCLA, University of California-Los Angeles; WBC, white blood cells; Westchester, New York Medical College. TABLE 14. ALL-2 Compared With L-20: Results of Treatment Frequency, % Result ALL-2, N ¼ 78 L-20, N ¼ 86 P Incidence of CR Deaths during induction 9 7 NS Resistant disease Time to CR, d Year survival rate NS CR in Phþ ALL Abbreviations: ALL, acute lymphoblastic leukemia; ALL-2, the acute lymphoblastic leukemia regimen (see Table 1); CR, complete remission; L-20, the standard 4-drug induction regimen (see Table 8); NS, nonsignificant; Phþ, Philadelphia chromosome-positive. men, 72% had B-lineage disease, and 17% had Ph-positive disease. The treatment arms were balanced in terms of pretreatment characteristics (see Tables 8-12). Response Sixty-five patients (83%) achieved CR in the ALL-2 arm compared with 61 patients (71%) in the L-20 arm (P ¼.06) (see Table 14). There was no significant difference in deaths between the 2 arms (9% on ALL-2 vs 7% on L- 20). Fewer patients failed with resistant disease on the ALL-2 arm (8% vs 21%; P ¼.02). The median time to CR was significantly shorter on the ALL-2 regimen compared with the L-20 regimen (32 days vs 55 days; P ¼.001) (Tables 8-12). Despite the superior outcome of induction therapy with the ALL-2 arm (higher CR frequency, less resistant disease, and shorter time to CR), there 1190 Cancer March 15, 2013
6 Treatment of Adults With ALL/Lamanna et al Figure 1. Overall survival is illustrated in patients with acute lymphoblastic leukemia stratified by treatment arm. ALL2 indicates the acute lymphoblastic leukemia regimen (cytarabine 3 g/m 2 daily for 5 days with mitoxantrone 80 mg/m 2 ); L20, the standard 4-drug induction regimen (vincristine, prednisone, cyclophosphamide, and doxorubicin followed by 4 cycles of consolidation). Figure 2. Overall survival is illustrated in patients with B-cell leukemia stratified by treatment arm. ALL2 indicates the acute lymphoblastic leukemia regimen (cytarabine 3 g/m 2 daily for 5 days with mitoxantrone 80 mg/m 2 ); L20, the standard 4-drug induction regimen (vincristine, prednisone, cyclophosphamide, and doxorubicin followed by 4 cycles of consolidation). TABLE 15. ALL-2 Compared With L-20: Survival Analysis Survival Rate, % Group 1 Year 2 Years 5 Years Median Survival (range), y Overall ALL ( ).60 L ( ) B-cell ALL ( ).75 L ( ) T-cell ALL (0.5 to NR).78 L (1.4 to NR) Phþ ALL (0.5-NR).17 L ( ) Abbreviations: ALL, acute lymphoblastic leukemia; ALL-2, the acute lymphoblastic leukemia regimen (see Table 1); L-20, the standard 4-drug induction regimen (see Table 8); NR, not reached; Phþ, Philadelphia chromosome-positive. was no significant difference in overall survival (Fig. 1, Table 15). Survival curves for patients with B-lineage, T-lineage and Ph+ disease are illustrated in Figures 2-4. Eighteen patients underwent allogeneic stem cell transplantation in first CR, and an additional 29 patients underwent transplantation in the salvage setting after they failed protocol therapy. Of these 47 patients (29%) who underwent allogeneic transplantation, there were 25 patients in the ALL-2 arm, and 9 of those patients remain alive; and there were 22 patients in the L-20 arm, and 5 of those patients remain alive. P Cytogenetics Twenty-nine patients (18%) had Ph-positive disease. This study was designed and largely conducted in the preimatinib era, and patients did not receive tyrosine kinase inhibitors. The frequency of CR was greater for patients with Ph-positive disease in the ALL-2 arm compared with their counterparts in the L-20 arm (85% vs 47%; P ¼.04). Survival for patients with Ph-positive disease at 6 years was 36% in the ALL-2 arm compared with 7% in the L-20 arm (Fig. 4). Toxicity The incidence of severe adverse events was similar in both arms (77 events [44 patients] in the ALL-2 arm vs 70 events [39 patients] in the L-20 arm; P value nonsignificant). Although patients in ALL-2 arm spent more time in the hospital during induction (median, 32 days vs 28 days), they spent fewer days inthehospitaloverall(70daysvs81daysforthose on the L-20 arm). An unusual toxicity noted in the ALL-2 arm was a second wave of myelosuppression that typically occurred between days 60 and 120, which probably was caused by the high-dose mitoxantrone as previously reported ,16 DISCUSSION In 1971, Clarkson and Fried reported the results of a 4- drug induction regimen in adults with ALL. 17 Since that early report, numerous regimens have been developed to treat these patients, but it is not clear that any of these regimens offer a substantial improvement over this early Cancer March 15,
7 Figure 3. Overall survival is illustrated in patients with T-cell leukemia stratified by treatment arm. ALL2 indicates the acute lymphoblastic leukemia regimen (cytarabine 3 g/m 2 daily for 5 days with mitoxantrone 80 mg/m 2 ); L20, the standard 4-drug induction regimen (vincristine, prednisone, cyclophosphamide, and doxorubicin followed by 4 cycles of consolidation). Figure 4. Overall survival is illustrated in patients with Phþ ALL stratified by treatment arm. ALL2 indicates the acute lymphoblastic leukemia regimen (cytarabine 3 g/m 2 daily for 5 days with mitoxantrone 80 mg/m 2 ); L20, the standard 4- drug induction regimen (vincristine, prednisone, cyclophosphamide, and doxorubicin followed by 4 cycles of consolidation). experience nearly 40 years ago. It is widely accepted that attaining a CR is absolutely essential for long-term survival and that regimens that can induce very high proportions of CRs are likely to cure more patients than regimens that achieve lower frequencies of CRs. In addition, essentially every published study on treating adults with ALL has indicated that patients who achieve their CR rapidly are more likely to be cured than patients who take longer than 4 or 5 weeks to achieve a CR. On the basis of these findings, many programs over the last 3 decades have focused on developing more intensive regimens to achieve a high frequency of CRs and to do so in a shorter time frame. Some groups have focused on developing regimens with a more intensive induction, 1,2,18,19 whereas others have studied intensifying consolidation or maintenance. 3,20-26 To our knowledge, none of these other intensified regimens have been compared in a prospective randomized fashion; therefore, it is not possible to know with certainty whether any of these approaches increase the likelihood of cure. Against this background, Weiss et al reported a phase 2 trial of a novel regimen that demonstrated a high CR frequency and substantially reduced the time to CR compared with historic controls. 11 Those results led to the current national, multicenter, prospective randomized trial of an induction based on high-dose mitoxantrone and cytarabine compared with a more traditional 4-drug induction regimen. The results from this trial may suggest some farreaching conclusions. In this study, several findings stand out. The more aggressive ALL-2 arm was superior in terms of time to CR (P ¼.001) and failure with resistant disease (P ¼.02). The frequency of CR appeared to be superior in the ALL-2 arm, though the P value had borderline significance (P ¼.06). Despite the apparent superiority of the ALL-2 regimen in terms of early surrogate markers, the 2 treatment arms had nearly identical survival curves. This result calls into question the long-held belief that developing a regimen that induces more patients into remission faster would improve long-term outcomes. Rather, the results from this trial suggest that only a fraction of adults has a curable form of ALL and that, as long as certain treatment parameters are included, the specifics of the treatment regimen do not matter. Taking this argument 1 step further, regimens that tout high frequencies of CR or the ability to achieve a CR quickly are likely ultimately to be no better than less aggressive regimens that achieve a lower proportion of CRs. In this view, such CRs are more cosmetic than of true clinical importance. Although, in the most technical sense, the results of this trial are applicable only to the 2 regimens that are compared, there are supporting arguments that need to be considered. In his landmark analysis, Ohno described a tight correlation between the median age of patients treated on a specific regimen and long-term (4-year, 5-year, or 6-year) survival. 27 The analysis by Ohno used age as the only predictive feature; presumably an analysis that incorporated other prognostic features may have even 1192 Cancer March 15, 2013
8 Treatment of Adults With ALL/Lamanna et al more accurately predicted long-term survival. The ability to accurately predict treatment results based solely on patient characteristics, independent of treatment regimen, strongly supports the concept that selected individuals have curable disease regardless of the regimen used. A second finding that can be derived from the analysis of Ohno is that the predictive model is not influenced by the time to CR or the fraction of patients achieving CR. Indeed, the time to CR and the frequency of CR appear to be predictive only within individual trials and do not correlate with long-term survival across trials. This reinforces the well recognized problem of comparing different phase 2 trials and, ultimately, the vital importance of conducting phase 3 randomized trials. Recently, several trials have reported high frequencies of CR. A closer look at 2 of those trials the Eastern Cooperative Oncology Group-Medical Research Council (ECOG-MRC) 2993 trial 3 and the University of Texas M. D. Anderson Cancer Center hyperfractionated cyclophosphamide, vincristine, doxorubicin, and dexamethasone (Hyper-CVAD) regimens 2 can be informative. The large ECOG-MRC United Kingdom ALL trial reported a CR frequency of 91% and a 5-year overall survival rate for all 1913 patients of 39%. Those results suggest that, in that study, the high CR frequency led to improved long-term survival compared with the regimens reported by others, including the regimens described in the current report. Such a simple comparison, however, ignores a fundamental issue: namely, differences in pretreatment patient characteristics. The ECOG-MRC trial was performed in patients predominantly aged 60 years, and the median age was 31 years. 28 The younger age of patients treated on the ECOG-MRC trial compared with the current study likely accounts for the differences in outcome. Age at diagnosis powerfully affects outcomes in this disease, as can be seen in the ECOG-MRC trial, in which <15% of patients were long-term survivors if they were aged >50 years at the time of treatment. Our colleagues at The University of Texas M. D. Anderson Cancer Center have reported the efficacy of Hyper-CVAD in 288 patients 2 who had a CR frequency of 92%, but the estimated 5-year survival rate was 38%. That study included older patients (median age, 40 years), with 20% aged >60 years; and, as is typical, the older patient cohort in that study had a lower CR frequency and high frequency of treatment-related mortality. All of these studies have succeeded in achieving a high frequency of CRs. But improvement in long-term survival has remained elusive. When the results of the current trial are viewed in the context of treatment results of other regimens it becomes more evident that the specifics of the treatment program may affect the fraction of patients achieving a CR and the time to CR but does not affect the likelihood of cure. Given this analysis it seems likely that improvements in curing more adults with ALL will require new drugs. Unfortunately the current structure of clinical research in adult ALL makes it difficult to evaluate new strategies and incorporate new drugs in a timely fashion. To study this uncommon disease cooperative groups are often needed and still these studies frequently require more than 10 years for meaningful accrual (this study was at 7 sites; the MRC UKALL/ ECOG was at more than 100 sites). Therefore, it is not surprising that progress in adult ALL has been so limited. Molecular markers in ALL have only recently been described, including the transcription factor Erg; expression of the orphan homeobox gene HO11L2; cytoplasmic (BAALC) gene expression; Notch/F-box and WD repeat domain-containing 7 (FBW7) mutations; and others. However, the best way to alter therapy based on this information remains uncertain. It seems likely that true progress in this disease depends on the development of new agents with novel mechanisms of action that target either common features of the disease, such as blinatumomab, 29 or specific molecular subtypes, such as tyrosine kinase inhibitors for Phpositive ALL and possibly gamma-secretase inhibitors for Notch-1 activating mutations in T-cell ALL. In conclusion, it remains clear that a concerted effort is needed to enroll these patients onto clinical trials that are evaluating novel therapies with the ultimate goal of increasing the fraction of patients who are cured of their disease. FUNDING SOURCES No specific funding was disclosed. CONFLICT OF INTEREST DISCLOSURES The authors made no disclosures. REFERENCES 1. Larson RA, Dodge RK, Burns CP, et al. A 5-drug remission induction regimen with intensive consolidation for adults with acute lymphoblastic leukemia: Cancer and Leukemia Group B Study Blood. 1995;85: Kantarjian H, Thomas D, O Brien S, et al. Long-term follow-up results of hyperfractionated cyclophosphamide, vincristine, doxorubicin, and dexamethasone (Hyper-CVAD), a dose-intensive regimen, in adult acute lymphocytic leukemia. Cancer. 2004;101: Goldstone AH, Richards SM, Lazarus HM, et al. In adults with standard-risk acute lymphoblastic leukemia, the greatest benefit is achieved from a matched sibling allogeneic transplantation in first complete remission, and an autologous transplantation is less Cancer March 15,
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