Body mass index at diagnosis is associated with survival outcome in peripheral T-cell lymphoma: a study of Chinese population.

Abstract

Obesity increases the risk for many diseases, including some malignancies. We found that in diffuse large B-cell lymphoma, the most common form of non-Hodgkin's lymphoma, patients with higher body mass index had significantly longer overall survival. Patients with peripheral T-cell lymphoma usually have worse outcomes than those with diffuse large B-cell lymphoma. Nonetheless, the association between body mass index at diagnosis and survival in patients with peripheral T-cell lymphoma remains unclear. This retrospective study included 411 peripheral T-cell lymphoma patients from January 2010 to July 2017. Patients were stratified by body mass index into low body mass index (<24.0kg/m2) and high body mass index (≥24.0kg/m2) groups. We mainly used Cox modelling and the Kaplan-Meier method to evaluate survival and other variables. Multivariate analysis demonstrated that body mass index, international prognostic index and triglyceride level were independent prognostic factors of overall survival. Interestingly, patients with high body mass index had significantly longer overall survival (P<0.01), with 69% of patients alive at 3years versus 43% in the low body mass index group. Cox analysis showed reduced mortality in the high body mass index group compared with the low body mass index group (hazard ratio=0.511, 95% CI, 0.309-0.846, P=0.009). In addition, patients with high body mass index and low international prognostic index had the longest overall survival (P<0.001). High body mass index at the time of diagnosis was associated with improved overall survival in Chinese peripheral T-cell lymphoma patients.