Over the past 9 years, total number of 147 patients with various types of malignant solid tumors were treated 220 times with high-dose chemotherapy supported by autologous bone marrow transplantation. Two most frequently used chemotherapeutic protocols were: cyclophosphamide 1,600 mg/m2 + adriamycin 80 mg/m2 + ACNU 3 mg/kg and cyclophosphamide 1,600-2,400 mg/m2 + adriamycin 80 mg/m2 + CDDP 100-120 mg/m2. There were 89 patients with advanced and/or recurrent diseases. The overall response (CR + PR) rate was 44.1% with the complete response (CR) rate, being 11.8% among 68 evaluable patients in this group. The most favorable response was obtained in breast cancer patients with 77.3% response rate and 13.6% CR rate. Nearly 50% of patients with gastric, lung, gynecological and pediatric malignancies responded, whereas poor responses were observed in the cases of pancreato-biliary, colorectal, esophageal cancers and melanoma. In 8 complete responders, three are alive and well without any evidence of disease 5 years after the treatment. There were 58 patients who underwent this treatment in adjuvant settings. There are 5 patients with breast cancer who have been followed over 5 years after treatment. All of them are alive and well without any demonstrable diseases. Four of them were in stage IIIa and histologically examined axillary nodes were positive in 14/15, 11/17, 37/44, 22/25. Autologous bone marrow transplantation seems to be instrumental in shortening the period of myelosuppression, thus allowing safe dose escalation in chemotherapy. Adequacy of cryopreserved marrow as marrow inoculum was ascertained with mononuclear cell count, cellular viability, CFU-GM, CFU-E, BFU-E and CFU-Mk.