Limited-stage mantle cell lymphoma: treatment outcomes at the Princess Margaret Hospital.

Mantle-cell lymphoma (MCL) is a rare cancer, with the majority of patients (pts) presenting in stage III-IV and the outcomes are poor. To determine the curability of localized MCL, we examine stage I-II pts at our institution between 1990-2007. 26 pts with stage I (38%) and stage II (62%) were referred. Sites involved were head and neck in 73%. Five had a blastoid variant. Five patients were treated with palliative intent. Analysis was focused on pts treated with a curative intent (21 pts): 17 CT+RT, 2 RT, 2 CT followed by ASCT. 13 patients received CHOP, 5-RCHOP, 1-CVP; most received 6 cycles. The RT median dose was 35Gy and IFRT for the majority. For 21 pts treated with a curative intent, median follow up was 5.8 years. The overall response rate was 95%. Among the 19 CR/CRu pts, 9 relapsed for a 5-year relapse rate of 46%. Relapses were mainly observed at distant sites, 3 were in GI tract, 1 had both local and distant relapse. Median PFS and OS were 3.2 and 6.4 years, respectively. 5-year OS was 62%. In univariate analysis, blastoid variant and stage II were prognostic factors for PFS. Multivariate analysis could not be performed due to the small sample size. With a treatment approach using combined CT+RT for stage I-II MCL, local control was achieved in 94%. Systemic relapse remains a significant problem, especially for stage II and blastoid variant. Radiotherapy should remain part of curative treatment plan in stage I-II MCL.