Panobinostat plus bortezomib and dexamethasone in relapsed/relapsed and refractory myeloma: outcomes by prior treatment

RESUMEN

Panobinostat is a potent pan-deacetylase inhibitor that affects the growth and survival of multiple myeloma (MM) cells through alteration of epigenetic mechanisms and protein metabolism. Panobinostat plus bortezomib and dexamethasone (PAN-BTZ-Dex) led to a significant increase in progression-free survival (PFS) vs placebo plus bortezomib and dexamethasone (Pbo-BTZ-Dex) in patients with relapsed or relapsed and refractory MM in the phase 3 PANORAMA 1 trial.

This subgroup analysis evaluated outcomes of patients in the PANORAMA 1 trial based on prior treatment: prior IMiD (n = 485); prior bortezomib plus IMiD (n = 193); and ≥ 2 prior regimens including bortezomib and an IMiD (n = 147). Median PFS for PAN-BTZ-Dex vs Pbo-BTZ-Dex across subgroups were as follows: prior IMiD (12.3 vs 7.4 months; hazard ratio [HR] 0.54; 95% CI, 0.43-0.68), prior bortezomib plus IMiD (10.6 vs 5.8 months; HR 0.52; 95% CI, 0.36-0.76), and ≥ 2 prior regimens including bortezomib and an IMiD (12.5 vs 4.7 months; HR 0.47; 95% CI, 0.31-0.72). Common grade 3/4 adverse events and laboratory abnormalities in patients who received PAN-BTZ-Dex across the prior treatment groups included thrombocytopenia, lymphopenia, neutropenia, diarrhea, and asthenia/fatigue.

Incidence of on-treatment deaths among patients who received prior bortezomib and IMiD (regardless of number of prior regimens) were similar between treatment arms.

This analysis demonstrated a clear PFS benefit of 7.8 months for PAN-BTZ-Dex among patients who received ≥ 2 prior regimens including bortezomib and an IMiD, a population with limited treatment options and poorer prognosis.

CITA DEL ARTÍCULO  Blood. 2016 Feb 11;127(6):713-21. doi: 10.1182/blood-2015-09-665018. Epub 2015 Dec 2.