The breast cancer treatment as a marker of progress in oncology.

This review is aimed to discuss the influence of the fundamental investigations in biology and oncology on the clinical strategy and tactics at the example of the breast cancer (BC). The survey of the influence of the theoretical investigations on the clinical methods, their level and results. The analysis of more than 60 years experience of Lviv oncological clinic in treatment nearly 20,000 patients with BC. The history of BC treatment is divided into periods in which different methods of treatment were dominant. We demonstrate the influence of the fundamental investigations on the clinical situation in BC.