[Cancer (present status)]

The basic biological aspects in relation to cancer are reviewed and how this concepts has influenced the rational treatment of this disease. The best results achieved in the treatment of cancer are obtained because of the use of a more radical treatment. And for the patients with not very advanced stages, the results have been improved with the prophylactic treatment on those areas where the tumor usually gives metastases. However, an early diagnosis and the proper treatment are the best way to obtain relieve in this group of patients.