RT Journal Article T1 Ibrutinib in Combination With Rituximab for Indolent Clinical Forms of Mantle Cell Lymphoma (IMCL-2015): A Multicenter, Open-Label, Single-Arm, Phase II Trial. A1 Giné, Eva A1 de la Cruz, Fátima A1 Jiménez Ubieto, Ana A1 López Jimenez, Javier A1 Martín García-Sancho, Alejandro A1 Terol, M José A1 González Barca, Eva A1 Casanova, María A1 de la Fuente, Adolfo A1 Marín-Niebla, Ana A1 Muntañola, Ana A1 González-López, Tomás José A1 Aymerich, Marta A1 Setoain, Xavier A1 Cortés-Romera, Montserrat A1 Rotger, Amanda A1 Rodríguez, Sonia A1 Medina Herrera, Alejandro A1 García Sanz, Ramón A1 Nadeu, Ferran A1 Beà, Silvia A1 Campo, Elías A1 López-Guillermo, Armando AB The need for an individualized management of indolent clinical forms in mantle cell lymphoma (MCL) is increasingly recognized. We hypothesized that a tailored treatment with ibrutinib in combination with rituximab (IR) could obtain significant responses in these patients. This is a multicenter single-arm, open-label, phase II study with a two-stage design conducted in 12 Spanish GELTAMO sites (ClinicalTrials.gov identifier: NCT02682641). Previously untreated MCL patients with indolent clinical forms defined by the following criteria were eligible: no disease-related symptoms, nonblastoid variants, Ki-67 Fifty patients with MCL (male 66%; median age 65 years) were enrolled. After 12 cycles of treatment, 42 (84%; 95% CI, 74 to 94) patients had an overall response, including 40 (80%; 95% CI, 69 to 91) with CR. Moreover, undetectable MRD in peripheral blood was achieved in 87% (95% CI, 77 to 97) of cases. At 2 years, 24 of 35 evaluable patients (69%) could discontinue ibrutinib because of undetectable MRD. Four patients had disease progression; three were non-nodal MCL and carried high genomic complexity and TP53 mutations at enrollment. No unexpected toxicity was seen except one patient with severe aplastic anemia. Frontline IR combination achieves a high rate of CRs and undetectable MRD in indolent clinical forms of MCL. Discontinuation seems appropriate in cases with undetectable MRD, except for TP53-mutated cases. YR 2022 FD 2022-01-14 LK http://hdl.handle.net/10668/20388 UL http://hdl.handle.net/10668/20388 LA en DS RISalud RD Apr 20, 2025