Peripheral T cell lymphoma: Clinico-pathological characteristics & outcome from a tertiary care centre in south India.

Background & objectives: Peripheral T cell lymphomas (PTCLs) are a heterogeneous group of non-Hodgkin's lymphomas (NHLs), with universally poor outcome. This study was undertaken to provide data on demographics and outcomes of patients with PTCL who underwent treatment in a single tertiary care centre in southern India.

Methods: Retrospective study was done on all patients (age ≥18 yr) diagnosed with PTCL from January 2007 to December 2012. The diagnosis of PTCL was made according to the WHO Classification of Tumors of Hematopoietic and Lymphoid Tissues.

Results: A total of 244 adult patients were diagnosed with PTCL (non-cutaneous). The most common subtype was PTCL-not otherwise specified (35.7%), followed by anaplastic large cell lymphoma (ALCL), ALK negative (21.3%), natural killer/T cell lymphoma, angioimmunoblastic T-cell lymphoma (AITL), ALCL, ALK positive, hepatosplenic T cell lymphoma (HSTCL) and adult T cell leukaemia/lymphoma followed in frequency with 13.1, 11.5, 8.6, 8.2 and 1.6 per cent cases, respectively. The three-year Kaplan-Meier overall survival (OS) and event-free survival (EFS) for the patients who received chemotherapy (n=122) were 33.8±5.0 and 29.3±4.7 per cent, respectively. Various prognostic indices developed for T cell lymphomas were found to be useful.

Interpretation & conclusions: Except for ALCL, ALK positive, all other PTCLs showed poor long-term outcome with CHOP-based chemotherapy. Novel therapies are needed to improve the outcome.