HSPA1A and plasma cell myeloma: In this study, we evaluated the combination of a proteasome inhibitor (bortezomib) with a HSP70 inhibitor (VER155008) to understand how pathways related to protein homeostasis behave (heat shock proteins, UPR, ubiquitin-proteasome system and autophagy) when we interfere in two important processes for myeloma cells survival.