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Patients 5 years postsurgery for breast cancer appear to have a very slowly decreasing hazard of recurrence. The mean hazard of recurrence between years 5 to 12 postsurgery is 4.3% per year. This group of patients may be well suited for trials evaluating cytostatic drugs or differentiating agents.

Fluorouracil plus levamisole is tolerable adjuvant therapy to surgery; it has been confirmed to substantially increase cure rates for patients with high-risk (stage III) colon cancer. It should be considered standard treatment for all such patients not entered into clinical trials.