Studying DNA in Tissue Samples From Caucasian and African-American Cancer Patients Who Received Docetaxel on Clinical Trial CLB-9871

bladder cancer, breast cancer, head and neck cancer, lung cancer, unspecified adult solid tumor, protocol specific, recurrent breast cancer, stage iiia breast cancer, stage iiib breast cancer, stage iiic breast cancer, stage iv breast cancer, extensive stage small cell lung cancer, recurrent small cell lung cancer