Clinical efficacy and safety of chemoimmunotherapy with rituximab,fludarabine and cyclophosphamide for chronic lymphocytic leukemia

Abstract

To evaluate the efficacy and safety of a chemoimmunotherapy regimen of rituximab, fludarabine and cyclophosphamide (FCR) for patients with chronic lymphocytic leukemia(CLL). The clinical data of 26 CLL patients receiving FCR regimen in our hospital from April 2003 to January 2012 were analyzed retrospectively. Patients were grouped according to indicators including Rai risk stratification, β(2)-MG, LDH, ZAP-70, CD38, cytogenetics and immunoglobulin heavy chain variable region gene (IgVH) mutation status. Therapy efficacy and survival were evaluated and the safety of FCR regimen was assessed. Among 26 patients, the overall response rate ( ORR ) was 76.9%, 10 patients (38.5%) achieved complete remission(CR) and 10(38.5%) partial remission(PR). With a median follow-up time of 30 ( 3-98 ) months, the median estimated progression-free survival(PFS) for all patients was 42(16-68) months and median overall survival(OS) was 63(41-85)months. Clinical parameters associated with higher CR rates were ＜2 courses of prior treatment regimens, proportions of bone marrow lymphocytes declining ≥ 50% after 2 courses of FCR, low LDH, low β(2)-MG and ZAP-70 negative (P = 0.014, 0.008, 0.027, 0.035 and 0.013, retrospectively). PFS and OS time in minimal residual disease(MRD)-negative, normal LDH and proportions of bone marrow lymphocytes declining ≥ 50% after 2 courses of FCR patients were significantly better than that of the control group (P＜0.05), PFS in the non-high-risk genetics group was significantly better than that in the high-risk genetics group (P = 0.005), while OS between two groups showed no statistically significant difference. The most common toxicities were gastrointestinal reactions (88.5%), followed by bone marrow suppression (80.8%): including neutropenia, anemia and thrombocytopenia. Infections accounted for 30.8%, mainly lung infection. FCR is an effective and well-tolerated therapy for patients with CLL. Patients with MRD-positive, elevated LDH, proportions of bone marrow lymphocytes declining＜50% after 2 courses of FCR and high risk genetics patients are suitable for more effective treatment after achieving treatment response.