HSP90B1 and neoplasm: Mammalian GRP94 has been reported outside the ER and also in small quantities on the cell surface (Altmeyer et al., 1996), particularly in tumor cells (reviewed in (Marzec, Eletto, & Argon, 2012)) where it is associated with stimulation of innate and adaptive anti‐tumor immune responses (reviewed in (Luo and Lee, 2013)).