Allogeneic stem cell transplantation as part of front line therapy for Mantle cell lymphoma.

Mantle cell lymphoma (MCL) is an aggressive form of non-Hodgkin lymphoma that remains incurable for the majority of patients. Allogeneic stem cell transplantation (alloSCT) produces long-term disease-free remissions for around 30-40% patients, however it is reserved for the treatment of relapsed disease. This study examined the use of front line transplantation for young patients in an attempt to improve outcomes. Twenty-five patients received an alloSCT using BEAM [BCNU (carmustine), etoposide, cytarabine, melphalan)-Campath conditioning following permissive induction therapy from both related and unrelated donors. This was a multi-centre prospective trial. Twenty-four of 25 patients engrafted with no non-relapse mortality events by day 100. With a median follow-up of 60·5 months, there have been six deaths (3 from MCL). The progression-free survival (PFS) and overall survival were 68% and 80% at 2 years and 56% and 76% at 5 years. PFS was very similar for both sibling and unrelated transplants and there was no difference in PFS between patients with respect to remission status prior to transplantation. Nine (38%) patients experienced acute graft-versus-host disease (GVHD) and 14 (58%) experienced chronic GVHD, of which 8 were extensive. Front line alloSCT is feasible but should only be considered for patients at high risk of early progression following conventional therapy.

RNA-seq of newly diagnosed patients in the PADIMAC study leads to a bortezomib/lenalidomide decision signature.

Improving outcomes in multiple myeloma will involve not only development of new therapies but also better use of existing treatments. We performed RNA sequencing on samples from newly diagnosed patients enrolled in the phase 2 PADIMAC (Bortezomib, Adriamycin, and Dexamethasone Therapy for Previously Untreated Patients with Multiple Myeloma: Impact of Minimal Residual Disease in Patients with Deferred ASCT) study. Using synthetic annealing and the large margin nearest neighbor algorithm, we developed and trained a 7-gene signature to predict treatment outcome. We tested the signature in independent cohorts treated with bortezomib- and lenalidomide-based therapies. The signature was capable of distinguishing which patients would respond better to which regimen. In the CoMMpass data set, patients who were treated correctly according to the signature had a better progression-free survival (median, 20.1 months vs not reached; hazard ratio [HR], 0.40; confidence interval [CI], 0.23-0.72; P = .0012) and overall survival (median, 30.7 months vs not reached; HR, 0.41; CI, 0.21-0.80; P = .0049) than those who were not. Indeed, the outcome for these correctly treated patients was noninferior to that for those treated with combined bortezomib, lenalidomide, and dexamethasone, arguably the standard of care in the United States but not widely available elsewhere. The small size of the signature will facilitate clinical translation, thus enabling more targeted drug regimens to be delivered in myeloma.