[A remarkable effect of K-18 (IgG-melphalan complex) in a case of RAEB with hypoplastic marrow].

A 63-year-old male with refractory anemia with excess of blasts (RAEB) and hypoplastic marrow was treated with K-18 (240 mg/day P.O.). On admission, peripheral blood revealed pancytopenia. Bone marrow specimen revealed severe hypocellularity with 18.9% of the blast cells. Ten months later, the blast cells in the bone marrow decreased to 3.8%, and complete remission (CR) was obtained. CR was eight weeks. Duration of response (CR + PR) continued for about eight months. K-18 is an antitumor agent with minimal side effects, and seems to be effective for RAEB with hypoplastic marrow.