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© 2001 American Society for Clinical Oncology
Long-Term Results of Blood and Marrow Transplantation for Hodgkins LymphomaByFrom the Johns Hopkins Oncology Center, Baltimore, MD. Address reprint requests to Richard J. Jones, MD, Johns Hopkins Oncology Center, The Bunting and Blaustein Cancer Research Building, Room 207, 1650 Orleans St, Baltimore, MD 21231; email: rjjones{at}jhmi.edu
PURPOSE: To evaluate the long-term outcome after allogeneic (allo) and autologous (auto) blood or marrow transplantation (BMT) in patients with relapsed or refractory Hodgkins lymphoma (HL).
PATIENTS AND METHODS: We analyzed the outcome of 157 consecutive patients with relapsed or refractory HL, who underwent BMT between March 1985 and April 1998. Patients RESULTS: The median follow-up after BMT for surviving patients was 5.1 years (range, 1 to 13.8 years). For the entire group, the probabilities of event-free survival (EFS) and relapse at 10 years were 26% (95% confidence interval [CI], 18% to 33%) and 58% (95% CI, 48% to 69%), respectively. According to multivariate analysis, disease status before BMT (sensitive relapse if responding to conventional-dose therapy or resistant disease if not) (hazard ratio [HR] = 0.39, P < .0001) and date of BMT (HR = 0.93, P = .004) were independent predictors of EFS, whereas only disease status (HR = 0.35, P < .0001) influenced relapse. There was a trend for probability of relapse in sensitive patients to be less after allo BMT at 34% (range, 8% to 59%) versus 51% (range, 36% to 67%) for the auto patients (HR = 0.51, P = .17). There was a continuing risk of relapse or secondary acute myeloid leukemia (AML)/myelodysplastic syndrome (MDS) for 12 years after auto BMT, whereas there were no cases of secondary AML/MDS or relapses beyond 3 years after allo BMT. CONCLUSION: There seems to be a clinical graft-versus-HL effect associated with allo BMT. Allo BMT for HL also seems to have a lower risk of secondary AML/MDS than auto BMT. Thus, allo BMT warrants continued study in HL.
HIGH-DOSE THERAPY followed by blood or marrow transplantation (BMT) has emerged as the treatment of choice for most patients with relapsed or refractory hematologic malignancies, including Hodgkins lymphoma (HL).1,2 Allogeneic (allo) BMT is generally preferred over autologous (auto) BMT for leukemias, because of the potent graft-versus-leukemia effect associated with allografts and concern regarding leukemic contamination of autografts. However, the role of allo BMT in patients with relapsed or refractory HL has been highly controversial, even though the median age of this disease is less than 30 years. Several series have suggested that allo BMT may be preferred over auto BMT in some patients with HL, because there seems to be a clinically significant graft-versus-HL effect.3-5 Conversely, there has been a preference in many centers for auto BMT in patients with recurrent HL.1,2,6-13 Moreover, recent reports from the International Bone Marrow Transplant Registry (IBMTR)14 and the European Group for Blood and Marrow Transplantation (EBMT)15 demonstrate disappointing results with allo BMT in HL and suggest that allo BMT should play a limited role in the treatment of this disease. It is possible that the different conclusions regarding the role of allo BMT in HL could be the result of patient selection. It is clear that a number of factors, especially disease status5-7,11,16 and number of relapses1,5,6,10 at the time of BMT, strongly influence the outcome of BMT for HL. At Johns Hopkins, allo BMT has been prioritized over auto BMT for HL based on our previous results, which first reported a graft-versus-lymphoma effect.3 The eligibility criteria and BMT conditioning regimens have been the same for the auto and allo patients. To investigate the impact of allo BMT on HL, especially with long-term follow-up, we analyzed the influence of various factors on the outcome of patients undergoing BMT for HL at our institution.
Patients Between March 1985 and April 1998, 157 consecutive patients with relapsed or refractory HL underwent BMT at the Johns Hopkins Oncology Center (Baltimore, MD). The first 55 patients were previously reported.3,16 Patients were eligible for BMT if they were 65 years of age and had progressed during, or relapsed after, standard chemotherapy regimens for HL. Additional eligibility requirements included a Karnofsky performance status of at least 70% and adequate cardiac (ejection fraction 45%), pulmonary (forced vital capacity 70%), hepatic (bilirubin 2 mg/dL), and renal (creatinine 2 mg/dL) function. Patients 55 years of age with an HLA-identical family member were prioritized to allo BMT. Before 1995, patients in first relapse were eligible for BMT only if their remission was less than 12 months. After 1995, all patients in first relapse were eligible for BMT. All patients gave informed consent for study participation as approved by the Joint Committee on Clinical Investigation of the Johns Hopkins Hospital.
Treatment Protocol
Study Definitions and Statistical Analysis The major statistical end points of this study were relapse and event-free survival (EFS) after BMT. All patients were included in this analysis. EFS was defined as the time from day of BMT until death from any cause at any time, disease progression, or secondary malignancy. Event-time distributions were estimated using the Kaplan-Meier method.22 For categorical prognostic factors, event time distributions were compared using the log-rank statistic.23
The significance of continuously distributed prognostic factors was tested using the proportional hazards model.24 The multivariate proportional hazards model was used to adjust for the effect of several prognostic factors simultaneously. For time-to-event distributions, point estimates are given ± 95% confidence intervals as determined from standard life-table methods.
Demographics Characteristics of the 157 consecutive patients with relapsed or refractory HL who underwent allo (n = 53) or auto (n = 104) BMT at the Johns Hopkins Oncology Center between March 1985 and April 1998 are listed in Table 1. Ninety patients (57%) had sensitive relapse at the time of transplant; 83 patients had either partial (n = 52) or complete response (n = 31) to a standard salvage chemotherapy, and seven patients were in untreated relapse after initial chemotherapy. The other 67 patients (43%) had resistant disease at the time of BMT; 60 patients were unresponsive to conventional salvage chemotherapy at relapse, and seven patients disease progressed through initial chemotherapy. Allo patients were more likely to have resistant disease (P = .06), to have suffered multiple relapses (P = .009), to have marrow involvement (P = .004), and to have B symptoms (P .0001) at the time of BMT compared with auto patients (Table 1). Other patient characteristics, including age, duration of first complete remission, type of preparative regimen, and year of BMT were comparable between the allo and auto patients. Autografts were purged with 4HC in 78 auto patients (75%) transplanted before 1996. Mobilized peripheral blood was the autograft in five patients. In the allo group, 28 (53%) of 53 patients received T-celldepleted bone marrow.
Engraftment The median times to an absolute neutrophil count (ANC) more than 500/µL and platelet count more than 25,000/µL untransfused were 30 days (range, 17 to 201 days) and 48 days (range, 22 to 201 days) in the 78 patients who received 4HC-purged autografts. The median times to an ANC more than 500/µL and platelet count more than 25,000/µL untransfused in the 26 auto BMT patients receiving unpurged autografts were 18 days (range, 9 to 36 days) and 32 days (range, 18 to 51 days), respectively. The median times to an ANC more than 500/µL and platelet count more than 25,000/µL untransfused were 15 days (range, 12 to 26 days) and 25 days (range, 17 to 74 days), respectively, in the allo BMT patients.
Survival
Prognostic Factors There were three significant risk factors for EFS in univariate analysis: disease status at the time of BMT, date of BMT, and number of previous regimens the patient received before BMT (Table 2). Other factors, including age, duration of first complete remission, type of preparative regimen and type of graft, did not have a significant prognostic impact on EFS. Significant risk factors for relapse were disease status at the time of BMT and age. No other factors had a significant impact on relapse rate (Table 2).
Multivariate analyses revealed that disease status (HR = 0.39, P < .0001) and BMT date (HR = 0.93, P = .004) were significant independent prognostic factors for EFS (Table 3). Disease status (HR = 0.35, P < .0001) was the only independent factor that significantly influenced the probability of relapse (Table 3). When compared to patients with resistant disease, the improved outcome for patients in sensitive relapse was the result of a lower nonrelapse mortality rate (15% v 30%, P = .03) (Table 4), as well as a lower rate of relapse (41% [95% CI, 35% to 49%] v 83% [95% CI, 75% to 90%] at 10 years, P < .0001). In particular, the transplant-related mortality was only 7% (three of 41 patients) in the patients undergoing auto BMT at first sensitive relapse. There was a trend for allo BMT, compared with auto BMT, to be associated with a higher mortality, both in the sensitive (24% v 12%, respectively; P = .20) and resistant (39% v 23%, respectively; P = .18) patients. Infections were the most common cause of transplant-related mortality in both the allo (seven [15%] of 53 patients) and auto patients (10 [9.6%] of 104 patients). Veno-occlusive disease of the liver accounted for three deaths (5.7%) in the allo patients and eight deaths (7.7%) in the auto patients. There were six deaths (11%) resulting from GVHD in the allo patients.
Because disease status had such a strong effect on EFS and relapse, the effect of potential prognostic factors on outcome of BMT for HL was evaluated in the 90 patients in sensitive relapse before BMT. Univariate analyses (Table 5) and multivariate analysis (Table 6) in this group revealed that the number of previous treatment regimens ( two v > two regimens) was a significant independent prognostic factor for EFS (HR = 0.59, P = .05) after BMT for HL in sensitive relapse. There was also a trend favoring allo BMT in regard to relapse, with auto BMT associated with a two-fold increased risk of relapse (HR = 0.51, P = .17). The probability of relapse at 10 years was 34% (95% CI, 8% to 59%) after allo BMT compared with 51% (95% CI, 36% to 67%) after auto BMT in the sensitive patients (Fig 2A). In addition, three patients in sensitive relapse developed secondary acute myeloid leukemia (AML)/myelodysplastic syndrome (MDS) at 3, 7, and 12 years after auto BMT, and two have died. There have been no secondary AML/MDS in the allo patients and no relapses beyond 3 years after BMT. The probabilities of EFS at 10 years were 44% (95% CI, 23% to 65%) after allo BMT and 33% (95% CI, 20% to 46%) after auto BMT for HL in sensitive relapse (HR = 0.82, P = .54, Fig 2B). The probabilities of overall survival at 10 years were 63% (95% CI, 41% to 79%) and 44% (95% CI, 29% to 58%) for the allo and auto patients, respectively (HR = 0.92, P = .83, Fig 2C).
Acute GVHD developed in 24 (45%) of 53 allo patients; in 14 (26%), the acute GVHD was to stage II. Chronic GVHD developed in 9 patients (17%). Considering the sensitive relapse group only, the actuarial probability of relapse among the 11 patients with GVHD (six acute GVHD only, three both acute and chronic GVHD, and two chronic GVHD only) was 14% (range, 0% to 40%) compared with 55% (range, 13% to 96%) among the 14 patients without GVHD (P = .24, Fig 3).
Although it is not yet fully clear that BMT produces better results than conventional-dose therapy for patients with relapsed or refractory HL, many now consider BMT the treatment of choice for most such patients.2 These data confirm that a number of factors, especially disease status and number of previous treatment regimens, strongly influence the outcome of BMT for HL.1,5-7,11,16 Thus, early BMT (ie, at first relapse), before the development of drug resistance and end-organ damage, will produce the best results in HL.9-11 There was a trend for allo BMT to be associated with a lower risk of relapse in the sensitive relapse patients. Although the lower risk of relapse after allo BMT in sensitive relapse patients did not reach statistical significance (P = .17), there was a two-fold lower risk after allo BMT by HR. This suggests that the lack of statistical significance may result from the relatively small sizes of the groups. The trend toward a lower risk of relapse after allo BMT in sensitive relapse, especially in those patients developing GVHD, suggests that allo BMT produces a clinical graft-versus-HL effect. A number of strategies that could potentially augment the graft-versus-HL effect, such as mobilized peripheral blood grafts or nonmyeloablative conditioning regimens with donor lymphocyte infusions, might improve the results of allo BMT for HL. However, these approaches may substantially increase the GVHD-related toxicity associated with allo BMT. Moreover, it is possible that nonmyeloablative conditioning regimens may decrease the efficacy of allo BMT in HL because the excellent results with auto BMT demonstrate the activity of high-dose conditioning regimens in this disease. Although the EFS after allo and auto BMT in patients in sensitive relapse is similar at 4 years, the long-term EFS may favor allo BMT. Multiple reports now confirm that the incidence of secondary AML/MDS after auto BMT for HL ranges from 5% to 25%,12,25,26 whereas it is rare after allo BMT. There were no cases of secondary AML/MDS, or relapses beyond 3 years, after allo BMT; whereas there was a continuing risk of relapse and secondary AML/MDS for 12 years after auto BMT. In fact, nearly 20% of the failures (relapse or secondary AML/MDS) after auto BMT occurred beyond 3 years after BMT. Review of data from the Autologous Blood and Marrow Transplant Registry27 and the Spanish Cooperative Group12 also shows a substantial number of late failures after auto BMT for HL. Most of our auto BMT patients received 4HC-purged grafts and, thus, experienced delayed hematopoietic recovery, which might have a negative impact on overall survival. However, the transplant-related mortality was only 7% (three of 41 patients), with only one infectious death, in the patients undergoing auto BMT at first sensitive relapse. The higher transplant-related mortality (23%) in the patients undergoing auto BMT in resistant disease is similar to that seen in other studies that did not use marrow purging.12,13,15 Relapse was the cause of failure in the vast majority of auto patients.
Recent reports from the IBMTR14 and the EBMT15 demonstrated disappointing results with allo BMT in HL and suggested that allo BMT should play a limited role in the treatment of HL. Although the details concerning the status of the patients in these reports was somewhat limited, it is clear that most of the patients in both of these reports had advanced, poor-risk disease. Half of the patients in the IBMTR series had a performance status at BMT of Allo BMT seems to produce a clinical graft-versus-HL effect that is associated with a lower risk of late relapse than auto BMT. Allo BMT for HL also seems to have a lower risk of secondary AML/MDS than auto BMT. The poor outcomes reported by the IBMTR14 and EBMT15 for allo BMT in HL probably results from the selection of unfavorable-risk patients. We believe that allo BMT warrants continued study in HL.
Supported in part by National Institutes of Health grant no. P01 CA15396.
Presented in the Oral Session at the Thirty-Fifth Annual Meeting of the American Society of Clinical Oncology, Atlanta, GA, May 15-18, 1999.
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Copyright © 2001 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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