In addition to being an intracellular molecule, we have previously reported that Hsp70 can also be selectively expressed on the plasma membrane of tumor cells using a unique mouse monoclonal antibody (clone cmHsp70.1, multimmune GmbH) which specifically recognizes the membrane form of Hsp70 [12]–[16], [19], [20]. Here, HSPA1A is linked to neoplasm.