[Cancer prophylaxis: gain or risk? (author's transl)]

One of the most important measures for the improvement in curative cancer therapy, stagnant during 25 years, will be a cancer prophylaxis as extensive, intensified and directed as possible. Seventy percent of all the cancerous diseases are produced by seven cancer species. Of these seven species, four are appropriate for a promising cancer prophylaxis: the mammary, uterine and intestinal catzinoma in women, the intestinal carcinoma in men. Risks as well as improvements concerning prophylaxic examination for cancer of the breast or prostatic carcinoma are discussed in detail.