Factors influencing overall survival by univariate and multivariate Cox-regression analysis.

Abbreviation: HR, hazard ration; CI, confidence interval; IPI, International Prognostic Index. aNumber of patients. bPrecursor T comprising of T-lymphoblastic lymphoma/leukemia; Mature T comprising of peripheral T-cell lymphoma not otherwise specified, natural killer/T-cell lymphoma, anaplastic large-cell lymphoma, angioimmunoblastic T-cell lymphoma, mycosis fungoides, enteropathy-type intestinal T-cell lymphoma, Lenert's lymphoma and subcutaneous panniculitis-like T-cell lymphoma. cIPI score is based on the presence or absence of five adverse prognostic factors including age ≥60 years, Ann Arbor stage III or IV, serum lactate dehydrogenase (LDH) levels elevated, Eastern Cooperative Oncology Group (ECOG) performance status (PS) ≥2, and >1 site of extranodal involvement. The presence of each above item adds one score to IPI.