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Blood, 1 December 2005, Vol. 106, No. 12, pp. 3725-3732.
Prepublished online as a Blood First Edition Paper on August 25, 2005; DOI 10.1182/blood-2005-01-0016.


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CLINICAL TRIALS AND OBSERVATIONS

Frontline therapy with rituximab added to the combination of cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) significantly improves the outcome for patients with advanced-stage follicular lymphoma compared with therapy with CHOP alone: results of a prospective randomized study of the German Low-Grade Lymphoma Study Group

Wolfgang Hiddemann, Michael Kneba, Martin Dreyling, Norbert Schmitz, Eva Lengfelder, Rudolf Schmits, Marcel Reiser, Bernd Metzner, Harriet Harder, Susanna Hegewisch-Becker, Thomas Fischer, Martin Kropff, Hans-Edgar Reis, Mathias Freund, Bernhard Wörmann, Roland Fuchs, Manfred Planker, Jörg Schimke, Hartmut Eimermacher, Lorenz Trümper, Ali Aldaoud, Reza Parwaresch, and Michael Unterhalt

From the Department of Internal Medicine III, University of Munich, Klinikum Großhadern; Department of Internal Medicine II, University Hospital Schleswig-Holstein, Campus Kiel; Department of Hematology and Oncology, Hospital St Georg, Hamburg; Department of Internal Medicine III, Klinikum Mannheim, University of Heidelberg; Department of Internal Medicine I, University of Homburg/Saar; Department of Internal Medicine I, University of Cologne; Department of Internal Medicine II, Oncology and Hematology, Klinikum Oldenburg; Department of Hematology, Oncology, and Tumor Immunology, Robert-Rössle-Klinik at the Helios Clinic Berlin-Buch, Charité, Campus Berlin-Buch; Department of Oncology, Klinikum Eppendorf, University of Hamburg; Department of Internal Medicine III, University of Mainz; Department of Internal Medicine A, University of Münster; Department of Hematology and Oncology, Kliniken Maria Hilf, Mönchengladbach; Department of Hematology and Oncology, University of Rostock; Department of Internal Medicine, Städtisches Klinikum Braunschweig; Department of Hematology and Oncology, St Antonius Hospital Eschweiler; Department of Hematology and Oncology, Städtische Krankenanstalten Krefeld; Praxis for Hematology and Oncology, Saarbrücken; Department of Hematology and Oncology, Katholisches Krankenhaus Hagen; Department of Hematology and Oncology, University of Göttingen; Praxis for Hematology and Oncology, Leipzig; and Department of Hemato-Pathology, University Hospital Schleswig-Holstein, Campus Kiel, Germany.


    Abstract
 Top
 Abstract
 Introduction
 Patients, materials, and methods
 Results
 Discussion
 Appendix
 References
 
Phase 2 studies suggest that the monoclonal antibody rituximab may improve the prognosis of patients with follicular lymphoma (FL) when it is added to chemotherapy. In the current study, 428 patients with untreated, advanced-stage FL were randomly assigned for therapy with cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) alone (n = 205) or CHOP combined with rituximab (R-CHOP) (n = 223). R-CHOP reduced the relative risk for treatment failure by 60% and significantly prolonged the time to treatment failure (P < .001). In addition, a significantly higher overall response rate (96% vs 90%; P = .011) and a prolonged duration of remission (P = .001) were achieved. In spite of a relatively short observation time, these beneficial effects even translated to superior overall survival (P = .016), with 6 deaths in the R-CHOP group compared with 17 deaths in the CHOP group within the first 3 years. The predominant treatment-related adverse effect was myelosuppression. Severe granulocytopenia was more frequently observed after R-CHOP (63% vs 53%; P = .01). However, severe infections were rare and of similar frequency after R-CHOP and CHOP (5% and 7%). Hence, adding rituximab to CHOP significantly improves the outcome for patients with previously untreated advanced-stage FL and does not induce major adverse effects.


    Introduction
 Top
 Abstract
 Introduction
 Patients, materials, and methods
 Results
 Discussion
 Appendix
 References
 
Follicular lymphoma (FL) is the second most frequent lymphoma subtype worldwide.1 Its incidence is rapidly increasing in Western countries and has nearly doubled within the past 3 decades. In most patients the disease is diagnosed at an advanced stage, III or IV, and cannot be cured by conventional therapeutic approaches. Hence, antilymphoma therapy is usually withheld for a watch-and-wait period until the disease becomes symptomatic. A broad spectrum of therapeutic options is available, ranging from radiotherapy to single-agent to combination chemotherapy.2-4 In spite of numerous efforts and the exploration of different treatment strategies, the prognosis of FL has literally remained unchanged in recent decades, with a median survival time of 8 to 10 years.5,6

Recently, new treatment modalities have been developed that justify the hope for improving the long-term outcome for patients with FL. These include myeloablative therapy followed by peripheral stem cell transplantation in younger patients, as indicated by a series of phase 2 studies.7-9 Two recently completed prospective randomized phase 3 trials by the German Low-Grade Lymphoma Study Group (GLSG)10 and the Groupe d'Études des Lymphomes de l'Adulte (GELA)11 showed significant prolongation of the event-free interval and, in the GELA study, of overall survival after high-dose therapy with stem cell transplantation for patients with FL in complete remission (CR) or partial remission (PR) after initial cytoreductive chemotherapy. This approach is restricted, however, to younger patients and is hampered by the risk for secondary leukemias and myelodysplastic syndromes.12-15 More specific, less toxic, and more broadly applicable treatment modalities are therefore warranted.

Monoclonal antibodies (mAbs) offer such a new and more targeted approach by serving as carriers for toxins or radioisotopes16-18 or as direct cytotoxic agents with inherent antilymphoma activity. Among these different options, the chimeric human-mouse anti-CD20 mAb rituximab appears most promising. As shown by in vitro studies, rituximab is able to lyse CD20+ cells by complement activation or antibody-dependent cell-mediated cytotoxicity.19 Other potential mechanisms of action include the induction of apoptosis, blockage of the G1-S transition, impairment of differentiation, and increased phosphorylation of cellular proteins.20 Because CD20 is expressed on many B-cell lymphomas, rituximab was expected to have a broad antilymphoma activity. Several phase 2 clinical trials, in fact, demonstrated a significant single-agent activity of rituximab in pretreated and in previously untreated patients with FL.21-25 In follow-up studies, rituximab was combined with chemotherapy, which demonstrated not only high remission rates of more than 90% but, even more important, long-lasting periods of freedom from disease progression.26-28

The GLSG recently completed a prospective randomized trial of rituximab in combination with chemotherapy compared with chemotherapy alone in patients with relapsed or refractory FL and mantle cell lymphoma (MCL). This study demonstrated a significant benefit for the rituximab chemotherapy combination in terms of overall response, time to treatment failure (TTF), and, most important, overall survival.29

These highly encouraging data prompted the GLSG to embark on a prospective evaluation of a rituximab chemotherapy combination compared with chemotherapy alone in patients with previously untreated FL at advanced-stage disease. Based on encouraging phase 2 data as reported by Czuczman et al30 and other investigators,31,32 the combination of cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) was chosen as the baseline regimen.


    Patients, materials, and methods
 Top
 Abstract
 Introduction
 Patients, materials, and methods
 Results
 Discussion
 Appendix
 References
 
Patients and entry criteria

This study was performed as a prospective, randomized, open-label multicenter phase 3 trial. It was started in 2000 and included patients 18 years of age and older with previously untreated, advanced-stage FL grades 1 and 2 according to the World Health Organization (WHO) classification.33 Histologic diagnoses of all patients were to be confirmed by a central review at 1 of 6 designated pathology reference centers.

Clinical entry criteria were stage III or IV disease and a requirement for therapeutic intervention as defined by the presence of B-symptoms (night sweats, fever, or weight loss), bulky disease (mediastinal lymphomas greater than 7.5 cm or other lymphomas greater than 5 cm in maximal diameter), impairment of normal hematopoiesis with hemoglobin level less than 100 g/L, granulocyte count less than 1.5 x 109/L, thrombocyte count less than 100 x 109/L, or rapidly progressive disease. Patients were ineligible if they had FL grade III, were pregnant or lactating, or were women of childbearing potential not using a reliable method of contraception.

The initial diagnostic work-up consisted of assessing the extent of the disease, including bone marrow biopsy, ultrasound examination of the abdomen, and computed tomography (CT) of the chest and abdomen. Normal organ function was confirmed by the respective laboratory tests and by echocardiography and electrocardiography.

Randomization and treatment protocol

Before its initiation, the study was approved by the Institutional Review Board of the Department of Medicine, University of Munich, Germany. Patients were enrolled into the study by the responsible physician after having given their written informed consent. Each patient underwent a central randomization procedure at the study center. Randomization was performed by a computer program stratified for age and number of adverse prognostic factors, as defined by the International Prognostic Index (IPI)34 using the method of random permutated blocks.

The CHOP combination consisted of cyclophosphamide 750 mg/m2 administered intravenously on day 1, doxorubicin 50 mg/m2 administered intravenously on day 1, vincristine 1.4 mg/m2 (maximum, 2.0 mg) administered intravenously on day 1, and prednisone 100 mg/m2 daily administered orally on days 1 to 5. Treatment cycles were repeated after every 3 weeks for a total of 6 to 8 cycles. Patients who were randomly assigned to the R-CHOP arm received a dose of rituximab 375 mg/m2 the day before the respective R-CHOP course.

The number of cycles depended on the response to the first 4 courses. Patients achieving CR after 4 cycles were treated with a total of 6 cycles only, whereas all other patients received 8 courses of CHOP or R-CHOP. Patients with progressive disease at any time during CHOP or R-CHOP therapy were taken off study.

Patients younger than 60 years achieving CR or PR after CHOP or R-CHOP were offered a second randomization for treatment in remission to either intensification by the DexaBEAM regimen consisting of dexamethasone 3 x 8 mg/d orally on days 1 to 10, bischloroethylnitrosourea (BCNU) 60 mg/m2 daily on day 2, melphalan 20 mg/m2 daily intravenously on day 3, etoposide 75 mg/m2 daily intravenously on days 4 to 7, and cytosine arabinoside 2 x 100 mg/m2 every 12 hours intravenously on days 4 to 7 with subsequent stem cell harvest followed by myeloablative radiochemotherapy with total body irradiation (12 Gy) and cyclophosphamide 60 mg/kg daily for 2 days and stem cell retransfusion or long-term interferon-{alpha} (IFN-{alpha}) maintenance initiated at a dose of 3 x 5 million U/wk and reduced according to observed adverse effects. IFN-{alpha} maintenance therapy was given until lymphoma progression or the development of intolerable adverse effects. The second randomization was stratified for the type of initial therapy (CHOP or R-CHOP) and the response to this treatment (CR or PR). All patients 60 years and older received IFN-{alpha} maintenance.

Evaluation and response criteria

Response to therapy was assessed after every 2 cycles of CHOP or R-CHOP and 4 weeks after the completion of the last course. Response evaluation consisted of physical examination, determination of blood count and lactate dehydrogenase (LDH) level, ultrasound of the abdomen, and CT of previously involved areas. In patients otherwise fulfilling the criteria of CR, bone marrow biopsy was performed. Except for CT of previously involved areas, which was repeated every 6 months, these analyses were performed every 3 months as follow-up.

Response was defined according to the International Working Group criteria.35 Hence, complete remission (CR) meant the elimination of all lymphoma manifestations for at least 4 weeks, including from the bone marrow, whereas partial remission (PR) was defined as a reduction of disease manifestations by at least 50% for more than 4 weeks. The category of unconfirmed complete remission (CRu) was not used. Instead, patients who fulfilled CR criteria but in whom bone marrow biopsy with evaluable negative result was not performed were considered to have achieved PR. The appearance of new nodal or extranodal manifestations or the enlargement of pre-existing lymphoma manifestations by more than 25% was considered disease progression.

TTF was defined as the interval between the start of treatment and the documentation of resistance to initial therapy, progressive disease, or death. Response duration was defined as the interval from the end of successful induction therapy to the documentation of progression or death, and overall survival was defined as the interval between the start of treatment and death.

Analyses were performed on an intention-to-treat basis without censoring for patients refusing the scheduled treatment in remission or receiving other unplanned therapies. Frequency and severity of adverse effects was recorded according to WHO toxicity criteria.

Statistical analysis

The comparison of CHOP alone with R-CHOP was designed to test whether the addition of rituximab could reduce the risk for treatment failure by 50% according to a proportional hazards assumption.

On this basis, a one-sided triangular sequential test for log rank analysis with a working significance level of 0.01 was applied. This procedure allowed for the detection of the assumed superiority of R-CHOP over CHOP alone with a probability of 95%. The sequential procedure was designed to be equivalent in power and working significance level to a fixed sample test with 148 observations. After randomization was completed, further explorative analysis was performed of CR and overall remission rate, duration of response, time to next therapy, and overall survival using the Fisher exact test for binary responses and the log rank test and univariate Cox regression analysis for time-censored observations.

Study conduct

The study was carried out in accordance with the modified Declaration of Helsinki. All patients gave their written informed consent after having been informed about the purpose and investigational nature of the trial. Before initiation the study received approval by the responsible ethics committee.


    Results
 Top
 Abstract
 Introduction
 Patients, materials, and methods
 Results
 Discussion
 Appendix
 References
 
Six hundred thirty patients with FL from 200 participating institutions of the GLSG were enrolled in the trial between May 2000 and August 2003. In June 2003 the applied one-sided sequential test showed a significantly longer TTF for the R-CHOP arm (P = .001), and randomization was stopped according to the protocol in August 2003 (Figure 1).

Patient characteristics

Only patients with completed documentation of initial therapy were evaluable for analysis. When randomization was stopped, 428 patients with FL were evaluable. The remaining 202 patients were either still on initial cytoreduction therapy or had not yet been documented. Median age of the evaluable patients was 56 years (range, 29-82 years). One hundred sixty-seven (39%) patients were 60 years of age or older. All patients had advanced-stage disease (stage III or IV) and were in need of therapy before entering the study. In 390 patients the histologic diagnosis of follicular lymphoma grade 1 or 2 was confirmed by a central pathology review; in 38 patients, results are pending. Table 1 summarizes the main patient characteristics and indicates a balanced distribution between the 2 treatment arms.


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Table 1.. Patient characteristics

 



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Figure 1.. Development of the one-sided sequential test of CHOP compared with R-CHOP over study time. In June 2003, the sequential test reached the upper limit, indicating a significantly longer TTF after R-CHOP than after CHOP. Randomization was subsequently stopped.

 
Treatment results

Two hundred five patients were treated with CHOP alone, and 223 patients were treated with R-CHOP. Overall response rates were 96% with R-CHOP and 90% with CHOP alone (P = .011); CR rates were not statistically different (20% vs 17%) (Table 2). After a median observation time of 18 months (range, 1-38 months), only 28 patients in the R-CHOP group experienced treatment failure compared with 61 patients in the CHOP group. Hence, R-CHOP led to a significant reduction in the risk for treatment failure by 60% and a significantly longer TTF (P < .001) (Figure 2A). In addition, the rate of relapse or progression after successful initial therapy was significantly lower in R-CHOP–treated patients, resulting in a significantly longer duration of response (P = .001) (Figure 2B). The outcome was favorable after R-CHOP therapy in all analyzed subgroups, including patients younger than 60 years and those 60 years and older and in patients with IPI scores of 1 or 2 compared with those of 3 to 5 (Table 3). Given that in FL disease progression does not necessarily require immediate retreatment, the time to next therapy was evaluated as well. For this parameter a significantly longer treatment-free interval was observed for R-CHOP–treated patients (P = .001).


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Table 2.. Response rates for CHOP and R-CHOP

 


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Table 3.. TTF for CHOP and R-CHOP based on patient age and IPI score

 



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Figure 2.. Time to treatment failure and duration of response after CHOP and R-CHOP. (A) TTF after start of therapy for CHOP and R-CHOP. In the R-CHOP arm, only 28 of 223 patients experienced treatment failure compared with 61 of 205 patients in the CHOP arm (P < .001). (B) Duration of response after CHOP and R-CHOP. In patients achieving CR or PR after initial therapy, a significantly lower relapse rate was observed after R-CHOP than after CHOP (P = .001).

 
Although the observation period is still relatively short for an assessment of overall survival, an advantage for R-CHOP has been observed (P = .016) (Figure 3). Hence, after 3 years, only 6 patients assigned to R-CHOP therapy have died compared with 17 assigned to CHOP therapy (Table 4). The estimated probability of survival at 2 years is 95% for those treated with R-CHOP and 90% for those treated with CHOP.


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Table 4.. Adverse effects after treatment with CHOP and R-CHOP

 



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Figure 3.. OS after start of therapy for CHOP and R-CHOP. Median OS has not been reached in either group. After 3 years, 6 patients in the R-CHOP arm have died compared with 17 patients in the CHOP arm (P = .016).

 
Adverse effects

Treatment-associated hematologic adverse effects were predominantly myelosuppression, particularly granulocytopenia (Table 5). Grades 3 and 4 granulocytopenia occurred after 63% of R-CHOP cycles compared with 53% of CHOP cycles (P = .01). This difference was clinically of minor relevance, however, because infections including fever of unknown origin were encountered after 5% of R-CHOP courses and after 7% of CHOP cycles only. Nonhematologic adverse events, which occurred at similar frequency after each regimen and were mostly mild to moderate, were primarily alopecia, nausea, and vomiting. Adverse events related to the infusion of rituximab were observed in 7% of courses during the first infusion; early cessation of rituximab therapy was required in 2 patients.


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Table 5.. Causes of death after CHOP and R-CHOP therapy

 
Therapy in remission

As indicated, patients younger than 60 years achieving CR or PR after R-CHOP or CHOP therapy were offered subsequent randomization for intensification followed by myeloablative radiochemotherapy and stem cell transplantation versus IFN-{alpha} maintenance. All elderly patients (60 years and older) received IFN-{alpha} maintenance therapy.

Of the 399 patients with CR or PR after initial therapy, 347 were evaluable for treatment strategies in remission. In 25 of these patients, no further treatment was applied (6% after R-CHOP and 8% after CHOP). Two hundred forty-three patients started IFN-{alpha} maintenance therapy (70% after R-CHOP and 70% after CHOP). Seventy-nine patients underwent intensification followed by myeloablative radiochemotherapy and stem cell transplantation (23% after R-CHOP and 22% after CHOP). These data show a balanced distribution of treatment in remission for the initial R-CHOP and CHOP arms, respectively.

At the time of this analysis, no differences were observed in patients after initial therapy with R-CHOP or CHOP who subsequently underwent intensification followed by myeloablative radiochemotherapy and stem cell transplantation. In patients receiving IFN-{alpha} maintenance therapy, however, a significantly longer duration of response has been observed for those who initially received R-CHOP treatment. Median duration of response has not yet been reached for this group, whereas it was 26 months for patients receiving initial CHOP treatment (P < .001) (Figure 4).


    Discussion
 Top
 Abstract
 Introduction
 Patients, materials, and methods
 Results
 Discussion
 Appendix
 References
 
Results of the current study clearly show that the addition of rituximab to frontline therapy with CHOP leads to a significantly better outcome for patients with symptomatic, advanced-stage FL compared with those receiving CHOP alone. R-CHOP was superior to CHOP for all tested response parameters, including TTF (P < .001), remission rate (P = .011), response duration (P < .001), time to next chemotherapy (P < .001), and even overall survival (OS) (P = .016). These beneficial effects were seen in all analyzed subgroups, including patients with low- or high-risk profiles according to the IPI or patients younger than 60 years and patients 60 years and older.

In a disease in which a curative approach is not yet available, the achievement of long periods without symptomatic disease and without the requirement of additional therapy is of great benefit to patients and is an essential goal of therapeutic measures aimed at a high quality of life. These goals can be achieved by R-CHOP in most patients without an increase of clinically relevant adverse effects. Although a high frequency (53%) of granulocytopenia grades 3 and 4 was observed after CHOP therapy and an even higher frequency (63%) was observed with R-CHOP therapy, this toxicity was clinically of moderate relevance since severe infections were only encountered after 5% of R-CHOP courses and after 7% of CHOP courses. It can certainly be argued that less intensive chemotherapeutic regimens, such as cyclophosphamide, vincristine, and prednisone (CVP) or even chlorambucil, induce fewer adverse effects. However, these therapies are associated with lower remission rates and shorter periods of progression-free survival requiring earlier and more frequent therapeutic interventions. The recently completed study by Marcus et al36 investigated the addition of rituximab to CVP therapy compared with CVP therapy alone and showed a significant advantage for R-CVP for remission rate (81% vs 57%; P < .001), TTF (27 months vs 7 months; P < .001), and time to next therapy (median not reached vs 12 months; P < .001). As in the current trial, this study demonstrates the beneficial effect of rituximab added to antilymphoma chemotherapy. However, remission rates and TTF achieved by R-CVP appear comparable to the results obtained by CHOP alone. A substantially better outcome seems to be achieved by R-CHOP. Adverse effects, particularly severe granulocytopenia, were less frequently encountered after CVP (14%) or R-CVP (24%) than after CHOP (53%) or R-CHOP (63%). However, clinically relevant infections were rare in both studies, with 4% after CVP and R-CVP compared with 7% after CHOP and 5% after R-CHOP. Hence, the more intensive CHOP regimen might be a more effective and still well-tolerated basis for combination with rituximab.



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Figure 4.. Duration of response for patients receiving IFN-{alpha} maintenance therapy or undergoing peripheral blood stem cell transplantation after CHOP and R-CHOP. Median duration of response has not been reached in patients receiving IFN-{alpha} maintenance after R-CHOP therapy, whereas it was 26 months after CHOP therapy (P = .001). At the time of this analysis, no differences were observed in patients after initial therapy with R-CHOP or CHOP who subsequently underwent intensification therapy followed by myeloablative radiochemotherapy and peripheral blood stem cell transplantation (PBCT).

 
A third recently completed randomized study by the GLSG investigated the addition of rituximab to a fludarabine, cyclophosphamide, and mitoxantrone (FCM) combination compared with FCM alone in patients with relapsed and refractory FL or mantle cell lymphoma. A significantly higher remission rate was also observed after R-FCM compared with FCM (79% vs 58%; P = .01). In addition, the duration of remission was significantly prolonged (16 months vs 10 months; P = .038) and, even more important, overall survival was significantly longer (median not reached vs 24 months; P = .003).29

These studies consistently show that adding rituximab to chemotherapy is associated with an improved outcome in patients with advanced-stage FL. However, the type of regimen to which rituximab is added probably has an important impact on patient outcome and must be further defined by subsequent prospective randomized studies.

Two findings in the current trial suggest that R-CHOP may have long-lasting beneficial effects and may even lead to improvement in overall survival. Hence, in spite of a relatively short observation time and a low overall mortality rate, survival was significantly prolonged. After 3 years, only 6 patients on the R-CHOP arm have died compared with 17 patients treated with CHOP alone.

These data are further supported by the prolonged survival after R-FCM therapy of patients with relapsed FL or mantle cell lymphoma.29 High proportions of patients with long-lasting disease-free and overall survival have also been observed by Czuczman et al28 after R-CHOP therapy in a nonrandomized phase 2 study with a 9-year follow-up period.

The second indication for a potential long-lasting beneficial effect of R-CHOP arises from the finding that the duration of response of patients receiving IFN-{alpha} maintenance was significantly longer after R-CHOP therapy than it was after CHOP alone. These data strongly suggest that adding rituximab to the initial chemotherapy has a substantial influence on subsequent therapy during remission.

A recently completed study by the Eastern Cooperative Oncology Group (ECOG) showed 2.7-year longer PFS with 2 years of rituximab maintenance therapy after conventional cytoreductive therapy with CVP.37 In 2 other studies rituximab was applied as initial single-agent therapy, and in this setting, the prolonged application proved superior to the "standard" schedule of 4 x 375 mg/m2.38,39

The data from all these studies consistently show that rituximab has a significantly beneficial effect in patients with advanced-stage FL when given in addition to initial chemotherapy or when given as maintenance therapy after cytoreduction therapy without rituximab or as prolonged application single-agent therapy. Therefore, the question is no longer whether rituximab should be applied with first-line therapy for advanced-stage FL but how it should be applied. Although further studies are needed to address this question in greater detail, it may be speculated that these different ways of application might not be used alternatively but rather complementarily and that they might be appropriate for different patient populations as defined by age, performance status, IPI, or the recently introduced IPI for follicular lymphoma (FLIPI)40 and other clinical or biologic risk factors. In this context, R-CHOP may be the preferred treatment option in patients with advanced-stage symptomatic disease in whom high remission rate and long-lasting remission are the primary goals of therapy.


    Appendix
 Top
 Abstract
 Introduction
 Patients, materials, and methods
 Results
 Discussion
 Appendix
 References
 
The following participating institutions recruited patients into the study and are listed in descending order of numbers recruited (institutions are in Germany unless otherwise noted). The listed persons were responsible for the trial: R. Forstpointner, M. Dreyling, W. Hiddemann, Department of Internal Medicine III, Klinikum Großhadern, University of Munich; C. Pott, M. Kneba, Department of Internal Medicine II, Campus Kiel, University of Schleswig-Holstein; N. Schmitz, P. Dreger, Department of Hematology and Oncology, Allgemeines Krankenhaus St Georg, Hamburg; E. Lengfelder, C. Kuhn, R. Hehlmann, Department of Internal Medicine III, Klinikum Mannheim, University of Heidelberg; R. Schmits, M. Pfreundschuh, Department of Internal Medicine I, University of Homburg/Saar; B. Metzner, H. J. Illiger, Department of Internal Medicine II, Klinikum Oldenburg; M. Reiser, M. Hallek, Department of Internal Medicine I, University of Köln; H. Harder, W. D. Ludwig, Department of Hematology, Oncology, and Tumorimmunology, Helios Klinikum Berlin-Buch, Robert-Rössle-Klinik, Charité, Campus Berlin-Buch; S. Hegewisch-Becker, Department of Internal Medicine II, Klinikum Eppendorf, University of Hamburg; T. Fischer, G. Hess, C. Huber, Department of Internal Medicine III, University of Mainz; M. Kropff, R. Mesters, W. E. Berdel, Department of Internal Medicine A, University of Münster; D. Kohl, H.-E. Reis, Department of Hematology and Oncology, Kliniken Maria Hilf, Mönchengladbach; M. Freund, Department of Hematology and Oncology, University of Rostock; B. Wörmann, Department of Internal Medicine, Städtisches Klinikum Braunschweig; R. Fuchs, Department of Hematology and Oncology, St Antonius Hospital, Eschweiler; M. Planker, M. Busch, M. Hipp, Department of Internal Medicine II, Städtische Krankenanstalten, Krefeld; J. Schimke, G. Jacobs, H. Daus, Praxis of Hematology and Oncology, Saarbrücken; H. Eimermacher, Department of Hematology and Oncology, Katholisches Krankenhaus, Hagen; B. Glass, C. Binder, L. Trümper, Department of Hematology and Oncology, University of Göttingen; A. Aldaoud, A. Schwarzer, Praxis for Hematology and Oncology, Leipzig; J. Preiss, P. Schmidt, Department of Hematology and Oncology, Caritasklinik St Theresia, Saarbrücken; C. Spohn, Praxis of Hematology and Oncology, Halle/Saale; O. Burkhard, B. Reimann, Praxis of Internal Medicine and Hematology, Worms; M. Wiermann, Department of Hematology and Oncology, University of Magdeburg; L. Labedzki, H. J. Bias, Department of Internal Medicine, Kreiskrankenhaus Waldbröl; W. Aulitzky, S. Martin, Department of Hematology and Oncology, Robert-Bosch-Krankenhaus, Stuttgart; H.-G. Mergenthaler, J. Schleicher, Department of Hematology and Oncology, Katharinenhospital, Stuttgart; A. Neubauer, Department of Hematology, Oncology, and Immunology, University of Marburg; J. Mezger, G. Göckel, Department of Hematology and Oncology, St-Vincentius Krankenhäuser, Karlsruhe; E. D. Kreuser, Department of Hematology and Oncology, Krankenhaus Barmherzige Brüder, Regensburg; R. Veelken, J. Finke, R. Mertelsmann, Department of Hematology and Oncology, University of Freiburg; K. Höffken, H. J. Fricke, Clinic of Internal Medicine II, University of Jena; W. Fassbinder, H.-G. Höffkes, Department of Internal Medicine III, Klinikum Fulda; R. U. Steimann, Department of Internal Medicine, Krankenhaus Coesfeld; M. Stauch, Praxis of Hematology and Oncology, Kronach; H.-J. Hurtz, R. Rohrberg, R. Behrens, Praxis of Hematology and Oncology, Halle/Saale; H. Becker, Department of Internal Medicine I, Hans-Susemihl-Krankenhaus, Emden; H. P. Lohrmann, H. Middeke, Department of Internal Medicine II, Klinikum Lippe-Lemgo; C. Peschel, C. v. Schilling, Department of Hematology and Oncology, Klinikum Rechts der Isar, University of Munich; W. Gassmann, T. Gaska, Department of Internal Medicine III, St-Marien-Krankenhaus Siegen; M. Sandmann, G. Becker, Department of Hematology and Oncology, St Antonius Kliniken, Wuppertal; S. Siehl, U. Söling, Praxis of Hematology and Oncology, Kassel; S. Kraus, I. Hausbrandt, Department of Hematology and Oncology, St Salvator Krankenhaus, Halberstadt; W. W. Reiter, Praxis of Hematology and Oncology, Viersen; M. Baldus, Praxis of Hematology and Oncology, Rüsselsheim; S. Hollerbach, Department of Gastroenterology, Allgemeines Krankenhaus Celle; P. Ketterer, O. Anders, Department of Oncology, Klinikum Südstadt, Rostock; H. Vetter, S. Fronhoffs, Department of Hematology and Oncology, Medizinische Poliklinik, University of Bonn; J. Pielken, V. Hagen, Department of Internal Medicine, St Johannes Krankenhaus, Dortmund; S. Fetscher, D. Nazarenus, Department of Hematology and Oncology, Städtisches Krankenhaus Süd, Lübeck; W. Brugger, I. Funke, Department of Hematology and Oncology, Medizinsche Klinik Villingen-Schwenningen; U. Schmitz-Huebner, Department of Internal Medicine II, Klinikum Kreis Herford; H. Wandt, J. Wortmann, Department of Hematology and Oncology, Klinik Nord und Medizinische Klinik, Nürnberg; U. Dührsen, H. Nückel, Department of Hematology, Medizinische Klinik und Poliklinik, Essen; E. Heidemann, J. Kaesberger, Department of Internal Medicine II, Diakonissenkrankenhaus, Stuttgart; D. Unverferth, W. Langer, Department of Radiotherapy and Hematology, Kreiskrankenhaus Aurich; H. J. Weh, B. Angrick, Department of Internal Medicine II, Franziskus Hospital, Bielefeld; W. Augener, Department of Internal Medicine II, St-Willehad-Hospital, Wilhelmshaven; M. Gramatzki, Department of Internal Medicine III, University of Erlangen; A. A. Fauser, M. Kiehl, Klinik für Knochenmark-transplantation, Hämatologie und Onkologie, Idar-Oberstein; U. Vehling-Kaiser, Praxis of Hematology and Oncology, Landshut; H. Huff, Department of Internal Medicine II, Klinikum Rosenheim; V. Lakner, S. Decker, Praxis of Hematology and Oncology, Rostock; M. Schauer, Praxis of Hematology and Oncology, Nürnberg; J. Wehmeyer, C. Lerchenmüller, Praxis of Hematology and Oncology, Münster; G. Heil, D. Kämpfe, Department of Hematology and Oncology, Klinikum Lüdenscheid; J. Grunst, H. Lambertz, L. Schulz, Department of Internal Medicine I, Klinikum Garmisch-Partenkirchen; G. Schlimok, Department of Internal Medicine II, Zentralklinikum Augsburg; M. Wegener, E. Therhardt-Kasten, Department of Internal Medicine, Malteserkrankenhaus St Anna, Duisburg; K. Wilms, H. Rückle-Lanz, M. Wilhelm, Department of Internal Medicine, Medizinische Poliklinik, University of Würzburg; H. P. Böck, H. E. Ballo, Praxis of Hematology and Oncology, Offenbach; N. Peter, Department of Internal Medicine II, Carl-Thiem-Klinikum, Cottbus; P. Weber, Department of Oncology, Siloah Krankenhaus, Pforzheim; T. Reiber, D. Semsek, Praxis of Internal Medicine, Hematology and Oncology; Freiburg; M. Hahn, Praxis of Hematology and Oncology, Ansbach; J. T. Fischer, S. Wilhelm, R. Ehrhardt, Department of Hematology and Oncology, Städtisches Klinikum Karlsruhe; S. Kremers, H. Täger, Department of Hematology and Oncology, Caritas Krankenhaus, Lebach; R. Berger, Department of Internal Medicine, Knappschaftskrankenhaus, Dortmund; J. Diers, Department of Internal Medicine and Oncology, Marienhospital, Vechta; P. Hesse, Department of Internal Medicine, Asklepios Klinik Parchim; V. Gross, L. Fischer v. Weikersthal, Department of Internal Medicine II, Klinikum St Marien, Amberg; E. Kettner, G. Krötki, Department of Hematology and Oncology, Städtisches Klinikum, Magdeburg; M. Frickhofen, H.-G. Fuhr, G. Müller, Department of Internal Medicine III, Dr-H.-Schmidt-Kliniken Wiesbaden; F. W. Kleinsorge, Praxis of Internal Medicine, Hematology and Oncology, Detmold; M. R. Clemens, Department of Internal Medicine, Mutterhaus der Borromäerinnen, Trier; H. Keller, H. Leber, D. Nöcker, Department of Radio-oncology, Brüderkrankenhaus St Josef, Paderborn; C. Kölbel, W. Weber, H. Kirchen, Department of Internal Medicine I, Krankenhaus der Barmherzigen Brüder, Trier; A. Koschuth, D. Kingreen, Praxis of Internal Medicine, Hematology, and Oncology, Berlin; O. Prümmer, J. Gatter, Department of Internal Medicine III, Klinikum Kempten-Oberallgäu; F. Henne, Praxis of Hematology and Oncology, Hechingen; A. Hoyer, Department of Internal Medicine, Hematology and Oncology, Harzkliniken Goslar; L. Mantovani, B. Matthé, Department of Hematology and Oncology, Städtisches Klinikum St Georg, Leipzig; K. Seitz, G. Käfer, Department of Internal Medicine and Oncology, Kreiskrankenhaus Sigmaringen; O. Brudler, B. Heinrich, Praxis of Hematology and Oncology, Augsburg; R. Hoffmann, Praxis of Hematology and Oncology, Norderstedt; W. Freier, Praxis of Oncology, Hildesheim; T. Bock, Praxis of Hematology and Oncology, Wittenberge; M. Grundheber, Praxis of Hematology and Oncology, Trier; M. Schwonzen, Department of Hematology and Oncology, St-Walburga-Krankenhaus, Meschede; A. Pfeiffer, Department of Internal Medicine II, Klinikum Memmingen; G. C. Schliesser, Praxis of Hematology, Giessen; U. von Grünhagen, Praxis of Hematology and Oncology, Cottbus; K. M. Josten, Praxis of Hematology and Oncology, Deutsche Klinik für Diagnostik, Wiesbaden; R. Voigtmann, E. Schilling, Department of Hematology and Oncology, Marienhospital Herne; R. Pasold, F. Rothmann, A. Haas, Department of Hematology and Oncology, Ernst-von-Bergmann-Klinik, Potsdam, T. Wagner, S. Peters, Department of Hematology and Oncology, University of Lübeck; I. Blau, Praxis of Hematology and Oncology, Berlin; S. Kruse, M. Don, Department of Internal Medicine, St Ansger Krankenhaus, Höxter; U. M. Schmidt, J. Schneider, Praxis of Hematology and Oncology, Berlin; M. Schmelz, Department of Internal Medicine, Ermstal-Klinik, Bad Urach; G. Seipelt, Praxis of Hematology and Oncology, Bad Soden; U. Enserweis, Praxis of Hematology and Oncology, Bochum; C. zur Verth, Klinikum Itzehoe; D. Ellbrück, Praxis of Hematology, Memmingen; H. R. Schmitt, Praxis of Oncology, Gerlingen; R. Thoms, Praxis of Internal Medicine, Grefrath; N. Nikolaidis, Department of Internal Medicine, St Elisabeth Hospital, Beckum; H. Culmann, B. Höpner, Praxis of Internal Medicine, Hematology, and Oncology, Bergisch Gladbach; P. Schüssler, H. Tanzer, Department of Internal Medicine I, Städtisches Krankenhaus, Bad Reichenhall; M. Pauw, Department of Internal Medicine, Städtisches Krankenhaus Nettetal; H. G. Biedermann, Department of Internal Medicine, Kreisklinik Trostberg; R. Guggenberger, D. Tummes, R. Weinberg, Praxis of Internal Medicine, Hematology, and Oncology, Aachen; W. Maurer, Department of Internal Medicine and Oncology, Städtisches Krankenhaus, Neunkirchen; G. Schumann, M. Schunk, Department of Internal Medicine, Städtisches Krankenhaus Landau/Pfalz; M. Eckart, Praxis of Hematology and Oncology, Erlangen; A. Kehl, Department of Hematology and Oncology, Evangelisches Krankhenhaus Wesel; U. Karbach, M. Schröder, Department of Internal Medicine, Hematology, and Oncology, Vinzentius-Krankenhaus Landau; H. Weiss, Department of Internal Medicine, St-Marien-Krankenhaus, Ludwigshafen; C. Maintz, Praxis of Hematology and Oncology, Würselen; M. Fromm, P. Borlinghaus, B. Sauter, Praxis of Hematology and Oncology, München; J. Brücher, B. Ullmann, Department of Internal Medicine, Robert-Koch-Krankenhaus, Gehrden; E. Höring, M. v. Ehr, M. Respondek, Praxis of Hematology and Oncology, Stuttgart; E. Schäfer, M. Just, Praxis of Hematology and Oncology, Bielefeld; K. Verpoort, W. Zeller, Praxis of Hematology and Oncology; Hamburg; D. Fritze, A. Rost, Department of Internal Medicine V, Klinikum Darmstadt; S. Hahnfeld, B. Krombholz, Praxis of Internal Medicine, Hematology and Oncology, Jena; B. Rendenbach, Praxis of Oncology, Trier; H. Köppler, J. Heymanns, R. Weide, Praxis of Hematology and Oncology, Koblenz; K. H. Beckers, Department of Internal Medicine, St-Lukas-Klinik, Solingen-Ohligs; R. Paliege, P. B. Majunke, Department of Internal Medicine, Klinikum Bad Hersfeld; A. Knuth, J. Orth, Department of Internal Medicine II, Krankenhaus Nordwest, Frankfurt; W. Bootsveld, Department of Internal Medicine, Hematology, and Oncology, Jakobi-Krankenhaus, Rheine; K. Günther, Klinik of Internal Medicine, Kreiskrankenhaus Reutlingen; and P. Czygan, Department of Internal Medicine II, Lukaskrankenhaus Neuss.


    Footnotes
 
Submitted January 5, 2005; accepted May 25, 2005.

Prepublished online as Blood First Edition Paper, August 25, 2005; DOI 10.1182/blood-2005-01-0016.

A complete list of the members of the German Low-Grade Lymphoma Study Group appears in participating "Appendix."

Supported by the Deutsche Krebshilfe (T14/96/Hi 1) and the Deutsches Bundesministerium für Bildung und Familie as part of the Competence Network Lymphomas.

W.H. wrote the manuscript; M. Kneba, M.D., N.S., T.F., M.F., B.W., L.T., R.P., and M.U. planned the study and wrote the study protocol; W.H., M. Kneba, M.D., N.S., E.L., R.S., M.R., B.M., H.H., S.H.-B., T.F., M. Kropff, H.-E.R., M.F., B.W., R.F., M.P., J.S., H.E., L.T., and A.A. treated patients and were responsible for documentation. R.P. organized the central pathology review. M.U. monitored the study, performed the statistical evaluation, and wrote the study report.

An Inside Blood analysis of this article appears in the front of this issue.

The publication costs of this article were defrayed in part by page charge payment. Therefore, and solely to indicate this fact, this article is hereby marked "advertisement" in accordance with 18 U.S.C. section 1734.

Reprints: W. Hiddemann, Department of Internal Medicine III, University of Munich, Großhadern Marchioninistr 15, 81377 München, Germany; e-mail: sekrmed3{at}med.uni-muenchen.de.


    References
 Top
 Abstract
 Introduction
 Patients, materials, and methods
 Results
 Discussion
 Appendix
 References
 

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Maintenance Rituximab After Cyclophosphamide, Vincristine, and Prednisone Prolongs Progression-Free Survival in Advanced Indolent Lymphoma: Results of the Randomized Phase III ECOG1496 Study
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Prospective trial of targeted radioimmunotherapy with Y-90 ibritumomab tiuxetan (Zevalin) for front-line treatment of early-stage extranodal indolent ocular adnexal lymphoma
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B. D. Cheson and M. J. Rummel
Bendamustine: Rebirth of an Old Drug
J. Clin. Oncol., March 20, 2009; 27(9): 1492 - 1501.
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Phase 1/2 study of fractionated 131I-rituximab in low-grade B-cell lymphoma: the effect of prior rituximab dosing and tumor burden on subsequent radioimmunotherapy
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In vivo Model of Follicular Lymphoma Resistant to Rituximab
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High-dose therapy followed by autologous purged stem cell transplantation and doxorubicin-based chemotherapy in patients with advanced follicular lymphoma: a randomized multicenter study by the GOELAMS with final results after a median follow-up of 9 years
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M. Foglietta, S. S. Neelapu, and L. W. Kwak
Therapeutic Vaccines for Lymphoma: From Bench to Bedside
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Vaccination with autologous tumor-loaded dendritic cells induces clinical and immunologic responses in indolent B-cell lymphoma patients with relapsed and measurable disease: a pilot study
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Phase III Trial of Consolidation Therapy With Yttrium-90-Ibritumomab Tiuxetan Compared With No Additional Therapy After First Remission in Advanced Follicular Lymphoma
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Evidence Mounts for the Efficacy of Radioimmunotherapy for B-Cell Lymphomas
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A Polymorphism in the Complement Component C1qA Correlates with Prolonged Response Following Rituximab Therapy of Follicular Lymphoma
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Blood, October 15, 2008; 112(8): 3312 - 3321.
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Phase III Study of R-CVP Compared With Cyclophosphamide, Vincristine, and Prednisone Alone in Patients With Previously Untreated Advanced Follicular Lymphoma
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J. Clin. Oncol., October 1, 2008; 26(28): 4537 - 4538.
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Phase II Multicenter Study of Bendamustine Plus Rituximab in Patients With Relapsed Indolent B-Cell and Mantle Cell Non-Hodgkin's Lymphoma
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Aiming at a Curative Strategy for Follicular Lymphoma
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Monoclonal Antibody Therapy for B-Cell Non-Hodgkin's Lymphoma
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Radiation Therapy with Tositumomab (B1) Anti-CD20 Monoclonal Antibody Initiates Extracellular Signal-Regulated Kinase/Mitogen-Activated Protein Kinase-Dependent Cell Death that Overcomes Resistance to Apoptosis
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Plant-produced idiotype vaccines for the treatment of non-Hodgkin's lymphoma: Safety and immunogenicity in a phase I clinical study
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Impact of Rituximab and/or High-Dose Therapy With Autotransplant at Time of Relapse in Patients With Follicular Lymphoma: A GELA Study
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J. P. Plastaras, E. Glatstein, and S. J. Schuster
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Bendamustine in Patients With Rituximab-Refractory Indolent and Transformed Non-Hodgkin's Lymphoma: Results From a Phase II Multicenter, Single-Agent Study
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Phase II Trial of a Transplantation Regimen of Yttrium-90 Ibritumomab Tiuxetan and High-Dose Chemotherapy in Patients With Non-Hodgkin's Lymphoma
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Myeloablative Therapy With Autologous Bone Marrow Transplantation for Follicular Lymphoma at the Time of Second or Subsequent Remission: Long-Term Follow-Up
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Haematologica, June 1, 2007; 92(6): 826 - 833.
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Rituximab Added to First-Line Mitoxantrone, Chlorambucil, and Prednisolone Chemotherapy Followed by Interferon Maintenance Prolongs Survival in Patients With Advanced Follicular Lymphoma: An East German Study Group Hematology and Oncology Study
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Immunochemotherapy With Rituximab and Overall Survival in Patients With Indolent or Mantle Cell Lymphoma: A Systematic Review and Meta-analysis
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Fas Receptor Clustering and Involvement of the Death Receptor Pathway in Rituximab-Mediated Apoptosis with Concomitant Sensitization of Lymphoma B Cells to Fas-Induced Apoptosis
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F Cabanillas, I Liboy, O Pavia, and E Rivera
High incidence of non-neutropenic infections induced by rituximab plus fludarabine and associated with hypogammaglobulinemia: a frequently unrecognized and easily treatable complication.
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