Abstract
Estrogen and progesterone receptor content was determined in 34 patients with synchronous and 23 patients with asynchronous bilateral breast cancer. Steroid receptor content was measured quantitatively by DCC method. It was shown that progesterone receptor content could not be predicted, as well as, that steroid receptor content of the second tumor significantly influenced the development of asynchronous bilateral breast cancer. The high discordance rate concerning histologic type between two tumors within synchronous as well as asynchronous biopsies was observed. The obtained results indicate that both synchronous and asynchronous bilateral breast tumors may be considered as biologically different tumors whose both steroid receptor levels should be determined whenever possible.
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