Rituximab in combination with high-dose methylprednisolone for the treatment of chronic lymphocytic leukemia

J E Castro, D F James, J D Sandoval-Sus, S Jain, J Bole, L Rassenti, T J Kipps, J E Castro, D F James, J D Sandoval-Sus, S Jain, J Bole, L Rassenti, T J Kipps

Abstract

We observed that high-dose methylprednisolone (HDMP) and rituximab was well tolerated and had promising activity when used in combination to treat patients with fludarabine-refractory chronic lymphocytic leukemia (CLL). This prompted us to evaluate the use of these agents in frontline therapy. A total of 28 patients with a median age of 65 years enrolled in this study. Patients received HDMP at 1 g/m(2) each day for 3 days during each of the three 4-week cycles together with rituximab and prophylactic antimicrobial therapy. The treatment was well tolerated with few adverse events of grade III or higher. The overall response rate was 96% (N=27). Nine patients (32%) achieved a complete remission (CR), two of which were without detectable minimal residual disease (MRD). Six patients with MRD received consolidation with alemtuzumab; five of these patients achieved an MRD-negative CR. With over 3 years of follow-up median progression-free survival was 30.3 months with only 39% of patients requiring additional therapy, and an overall survival was 96%. This study demonstrates that HDMP and rituximab is an effective nonmyelosuppressive treatment combination for patients with CLL that warrants consideration particularly for patients with limited myeloid reserve that might not tolerate standard treatment regimens.

Figures

Figure 1. Platelet counts and hemoglobin throughout…
Figure 1. Platelet counts and hemoglobin throughout treatment with high-dose methylprednisolone (HDMP) and rituximab
Mean platelet counts (solid line) and hemoglobin levels (dashed line) of 28 patients from pre-treatment values on day one assessed throughout therapy until two month following treatment completion. Error bars represent standard error. Abbreviations: Wk, week; gm, gram; dl, deciliter; ml, microliter.
Figure 2. Individual patient hemoglobin, platelet count,…
Figure 2. Individual patient hemoglobin, platelet count, white blood cell and absolute lymphocyte count, total lymph node product, and spleen size prior to and following treatment with High-dose Methylprednisolone (HDMP) and Rituximab
Clinical disease characteristic prior to and following treatment with HDMP and Rituximab for individual patients in Group A (Left Panel) and Group B (right panel). Baseline and Final Hemoglobin (Hgb), platelets (plts), total white blood cell (WBC) count, absolute lymphocyte count (ALC), Bidimensional lymph node (LN) product, and splenomegaly measured centimeter (cm) below left costal margin (LCM).
Figure 3. Progression free survival (PFS), treatment…
Figure 3. Progression free survival (PFS), treatment free survival (TFS) and overall survival for patients treated with High-Dose Methylprednisolone (HDMP) and Rituximab
Kaplan-Meier curves for (A) PFS and (B) TFS by response to HDMP and Rituximab. (C) PFS and (D) TFS including responses following consolidation with alemtuzumab. (E) Overall survival over median 36.3 months follow-up. Abbreviations: Complete Response (CR) with or without (+ / −) Minimal Residual Disease (MRD), Partial Response (PR), Stable Disease (SD), nodular PR (nPR), NA signifies median time to PFS or TFS has not been reached.
Figure 4. Progression free survival (PFS) and…
Figure 4. Progression free survival (PFS) and treatment free survival (TFS) for all patients and excluding those patients who received aleumtuzumab as consolidation
Kaplan-Meier Curves demonstrate Median PFS (Top) and TFS (Bottom) projected at 30.5 and 33.3 months for 28 patients, excluding the six patients who received alemtuzumab consolidation PFS and TTNT is 20.5 and 31.5 months respectively.
Figure 5. Pharamcokinetics of rituximab for group…
Figure 5. Pharamcokinetics of rituximab for group 2 patients
Mean rituximab concentration for six group 2A patients (solid line) treated with rituximab 750 mg/m2 administered as consecutive daily dosing during cycle 1 and five group 2B patients (dashed line) treated with weekly rituximab- error bars represent standard deviation. Abbreviations: mu, microgram; ml, milliliter.

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