Results are presented concerning the first two cycles of a breast cancer screening program carried out by USSL 41 (the local social health center). 38,000 women were examined in a period ranging from 1987 to 1993 and more than 250 early stage tumors were diagnosed. Early detection by screening is confirmed by tumor size and nodal involvement. Overall, this program carried out in Brescia met requirements set by international and national scientific committees. Good results were obtained as far as quality standards are concerned. The importance of screening is evaluated concerning surgical treatment undergone by the patients. The study of surgical treatment clearly shows the gradual progression of conservative surgery deviating from more destructive operations.