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The impact on 100 patients of information and consent forms signed prior to medical oncology clinical trials was evaluated by a survey at a subsequent visit. Only 40 patients believed that the purpose of the form was to explain the treatment. The form was listed as the major source of information by 12 patients while 52 listed a doctor and 26 a nurse. Although 21 patients believed that the form mad them less anxious, 19 patients believed that it made them more anxious. Despite 80 patients reading all of the form, 60 claiming to understand all of it and 68 claiming that in contained adequate information, in tests of recall only 52 patients could name all of their drugs and only 4 all of the side effects. The number of drugs named correlated with how much of the consent form had been read (p = 0.003) and the highest education level achieved by the patient (p = 0.0003). Patients under 55 years had significantly better recall. Patients with a better ECOG performance status were more likely to find the form very helpful. Such forms may not ensure that the requirements for informed consent are satisfied.

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