Bendamustine-Rituximab in Young CLL: Relevance in the Era of Small Molecule Inhibitors.

Purpose: Chemo-immunotherapies like Fludarabine-Cyclophosphamide-Rituximab (FCR) are used for treatment of chronic lymphocytic leukemia (CLL) in young and fit patients while Bendamustine-Rituximab (BR) is used in older patients. In a resource constrained setting, managing toxicities of FCR chemotherapy is challenging and this study explores the use of upfront BR treatment in young CLL patients (age < 65).

Methods: Data of 61 CLL patients treated with the BR regimen between 2016 and 2020 was analysed. Overall-survival and progression-free-survival (OS and PFS) were compared between the two age groups (< / > 65 years) and correlated with the fluorescent-in-situ-hybridization (FISH) data, duration of illness and time to initiation of chemotherapy.

Results: Out of 61 patients, 34 (85%) were below 65 years. Five patients had del 17p and were excluded from the analysis. Forty patients had indications for treatment. Twenty-four (70.5%) of the forty patients achieved overall response; 10 developed progressive disease. The median OS and PFS was 1874 days (95% CI 1617-2130 days) and 1226 days (95% CI 1021-1432 days) respectively and were non inferior between the 2 age-groups. There were no correlations with clinical, laboratory or FISH parameters. The OS and PFS were better for patients with longer time to initiation of chemotherapy as compared to those with short duration of illness and short wait-and-watch periods ( < 0.000).

Conclusions: Our results show that BR chemotherapy can safely and effectively be used in upfront treatment of young CLL patients and provide durable responses.