Pregnancy-associated breast cancer (PABC) is defined as breast cancer occurring anytime during gestation, lactation, or within 1 year after delivery. The incidence is between 1 in 3000 and 1 in 10,000 pregnancies and comprises about 0.2% to 3.8% of all breast cancers diagnosed in women under the age of 50 years. As women tend to delay childbearing into their third and fourth decades, the incidence of PABC is expected to increase. Here we reported two PABC patients with similar clinic and pathologic characters received chemotherapy before or after termination of pregnancy respectively, and found that the former got pathologic complete response. Based on the phenomena and the fact that endocrine hormones may have chemosensitization role in cancer chemotherapy, which is called hormonosensitizing chemotherapy (HSCT), endocrinosen-sitizing chemotherapy (ESCT) or neoendocrinochemotherapy (NECT), suggestion is proposed that chemotherapy should be taken before or immediately after termination for PABC, especially for the patients who prefer to artificial abortion, which may possibly acquire improved chemotherapeutic effect.