FIELD: medicine, oncology. SUBSTANCE: invention relates to method of sensitization of cancer cells to lysis mediated by killer-cells and product. Method involves administration to patient of effective amount of antiestrogen and killer-cells in combination of successively and killer-cells are taken among cell groups EKK, LAKK and TSTL and antiestrogen is taken among of the group of antiestrogens of class triphenylethylene, for example, tamoxifen or toremifen or their pharmaceutically acceptable salts. EFFECT: delayed tumor growth. 13 cl, 3 tbl, 10 dwg, 6 ex
