FKBPL and neoplasm: Although secretion of FKBPL has not been observed by the parental MDA-MB-231 cells, FKBPL overexpressing MDA-MB-231 cells demonstrated FKBPL secretion invitro[11]; this secretion, if occurring invivo would support the FKBPL-mediated anti-angiogenic effects on the murine tumour endothelium.