BCL2L1 and plasma cell myeloma: The low toxicity profile is in line with a phase I study from 2016 investigating the effects of therapeutic vaccination with short peptides from the proteins Bcl-2, Bcl-XL, and Mcl-1 in patients with relapse of multiple myeloma where no toxicity other than what was to be expected from standard treatment with bortezomib (proteasome inhibitor) were reported (36).