RT Journal Article T1 Risk of, and survival following, histological transformation in follicular lymphoma in the rituximab era. A retrospective multicentre study by the Spanish GELTAMO group. A1 Alonso-Álvarez, Sara A1 Magnano, Laura A1 Alcoceba, Miguel A1 Andrade-Campos, Marcio A1 Espinosa-Lara, Natalia A1 Rodríguez, Guillermo A1 Mercadal, Santiago A1 Carro, Itziar A1 Sancho, Juan M A1 Moreno, Miriam A1 Salar, Antonio A1 García-Pallarols, Francesc A1 Arranz, Reyes A1 Cannata, Jimena A1 Terol, María José A1 Teruel, Ana I A1 Rodríguez, Antonia A1 Jiménez-Ubieto, Ana A1 González de Villambrosia, Sonia A1 Bello, José L A1 López, Lourdes A1 Monsalvo, Silvia A1 Novelli, Silvana A1 de Cabo, Erik A1 Infante, María S A1 Pardal, Emilia A1 García-Álvarez, María A1 Delgado, Julio A1 González, Marcos A1 Martín, Alejandro A1 López-Guillermo, Armando A1 Caballero, María D K1 cumulative incidence K1 follicular lymphoma K1 transformation AB The diagnostic criteria for follicular lymphoma (FL) transformation vary among the largest series, which commonly exclude histologically-documented transformation (HT) mandatorily. The aims of this retrospective observational multicentre study by the Spanish Grupo Español de Linfoma y Transplante Autólogo de Médula Ósea, which recruited 1734 patients (800 males/934 females; median age 59 years), diagnosed with FL grades 1-3A, were, (i) the cumulative incidence of HT (CI-HT); (ii) risk factors associated with HT; and (iii) the role of treatment and response on survival following transformation (SFT). With a median follow-up of 6·2 years, 106 patients developed HT. Ten-year CI-HT was 8%. Considering these 106 patients who developed HT, median time to transformation was 2·5 years. High-risk FL International Prognostic Index [Hazard ratio (HR) 2·6, 95% confidence interval (CI): 1·5-4·5] and non-response to first-line therapy (HR 2·9, 95% CI: 1·3-6·8) were associated with HT. Seventy out of the 106 patients died (5-year SFT, 26%). Response to HT first-line therapy (HR 5·3, 95% CI: 2·4-12·0), autologous stem cell transplantation (HR 3·9, 95% CI: 1·5-10·1), and revised International Prognostic Index (HR 2·2, 95% CI: 1·1-4·2) were significantly associated with SFT. Response to treatment and HT were the variables most significantly associated with survival in the rituximab era. Better therapies are needed to improve response. Inclusion of HT in clinical trials with new agents is mandatory. YR 2017 FD 2017-08-07 LK http://hdl.handle.net/10668/11483 UL http://hdl.handle.net/10668/11483 LA en DS RISalud RD Apr 9, 2025