DISEASE CHARACTERISTICS: Histologically confirmed metastatic or unresectable solid tumor of one of the following types: Small cell lung cancer Extensive stage (disease outside the hemithorax) or relapsed Prior cytoreduction with platinum/etoposide regimen and/or taxane containing regimen Epithelial breast cancer Stage IV or relapsed disease Prior cytoreduction with adriamycin and/or taxane regimens Testicular germ cell cancer Failure to achieve complete remission with platinum based chemotherapy Relapsed disease with at least one salvage regimen Melanoma Metastatic disease that has failed at least one biologic response modifier such as interleukin-2 or interferon Relapsed disease involving a visceral organ Renal cell cancer Metastatic disease that has failed at least one biologic response modifier such as interleukin-2 or interferon Relapsed disease involving a visceral organ HLA matched or one antigen mismatched related donor available Hormone receptor status: Not specified

PATIENT CHARACTERISTICS: Age: Under physiologic 60 Menopausal status: Not specified Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: Not specified Hepatic: Bilirubin no greater than 2.0 mg/dL unless due to Gilbert's disease SGOT no greater than 3 times upper limit of normal Renal: Creatinine no greater than 2.0 mg/dL Cardiovascular: No congestive heart failure LVEF at least 40% Pulmonary: DLCO at least 45% of predicted OR FEV1/FVC at least 50% of predicted Other: HIV negative Not pregnant or nursing Fertile patients must use effective contraception

PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics Chemotherapy: See Disease Characteristics Endocrine therapy: Not specified Radiotherapy: No prior radiotherapy that would preclude study Surgery: See Disease Characteristics