Methodological and ethical difficulties in clinical oncology studies.
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D000328:Adult; D002986:Clinical Trials as Topic / Q000379:methods* / Q000592:standards; D004359:Drug Therapy, Combination; D004992:Ethics, Medical; D006801:Humans; D007558:Italy; D009369:Neoplasms / Q000188:drug therapy*; D018579:Patient Selection; D012107:Research Design