Since we found here that Hsp70 membrane-positive tumor sublines do not bind Annexin-V-FITC and since cell viability, plating efficiency, and doubling-time was comparable in Hsp70 membrane-positive and -negative tumor sublines, it appears unlikely that PS serves as the interacting partner for Hsp70 in the plasma membrane of the cells used in the current study. The gene discussed is ANXA5; the disease is neoplasm.