Light Chain Amyloidosis (AL) Associated With B Cell Lymphoma a Single Center Experience

Abstract

IntroductionLight chain (AL) amyloidosis and B‐cell lymphoma represent 5% to 7% of all AL, Systemic amyloidosis, deposits in sites remote from the underlying lymphoma, and peritumoral amyloidosis deposition is within the immediate vicinity. Materials and MethodsWe conducted a retrospectively study to identify and describe AL with B cell lymphoma at Princess Margaret Cancer Center from 01 January 1997 to 31 July 2019. ResultsThirty-five patients with AL and lymphoma, an incidence of 6, 2%, median age of diagnosis of 66 (range 47 to 86), majority male, most had underlying Waldestrom's Macroglobulinemia. 21 patients with peritumoral AL (PAL), and 15 with systemic AL. 42.8% of the patients had major organ involvement. 35% got treatment with Rituximab with alkylator, 20% received proteasome inhibitors, 17% patients were on a watch and wait approach, amyloid response showed very good partial response > 45.8%, and lymphoma ORR was 42.8%, with a median follow up of 31.5 months. A 36 month overall survival (OS) and progression-free survival (PFS) showed worse outcomes for heart involvement OS (P = .002), PFS (0.057) and IgM subtype OS (P = .02), PFS (0.01). ConclusionWe have shown adverse outcome with IgM AL and to document a differences in OS and PFS not previously reported for PAL.