BCL2 is a regulator of apoptosis that functions to promote cell survival and inhibit the actions of proteins involved in the apoptosis cascade. Overexpression of BCL2 has an oncogenic effect and is correlated with increasing the lifespan of B cells. Cancers that are positive include follicular lymphomas due to t(14,18)(q32;q21), which brings BCL2 gene adjacent to the active immunoglobulin heavy chain (IgH) gene. In addition, positive staining is expected in diffuse large B-cell cell lymphomas and myelodysplastic syndrome. In normal tissues, positive expression is found in mantle zone B cells, germinal center T cells, and several other tissues. References: Cell Death and Differentiation 25:65, 2018; Am J Surg Pathol 2011;35:1691, Am J Surg Pathol 2009;33:591