Neoadjuvant chemotherapy for breast cancer could make unresectable breast cancer be resectable and improve breast conservation rate. Patients with triple negative or Her2 enriched subtype who achieved pCR after neoadjuvant chemotherapy would have better survival. But the overall pCR rate of breast cancer was about 20%. And patients with luminal like subtype were less reactive for neoadjuvant chemotherapy. Improving pCR rate maybe could achieve better survival. So, different methods have tried to select effective drug before chemotherapy.Drug sensitivity screening in vitro for different chemotherapy drugs was a promising method. This study will explore whether drug screening by culturing breast cancer cells in vitro from breast cancer tissue could consistent with neoadjuvant chemotherapy in patients.40 breast cancer patients were recruited.The results of drug sensitivity in vitro and pathological evaluation after neoadjuvant chemotherapy were compared whether they were consistent.

Neoadjuvant chemotherapy for breast cancer could make unresectable breast cancer be resectable and improve breast conservation rate. Patients with triple negative or Her2 enriched subtype who achieved pCR after neoadjuvant chemotherapy would have better survival. But the overall pCR rate of breast cancer was about 20%. And patients with luminal like subtype were less reactive for neoadjuvant chemotherapy. Improving pCR rate maybe could achieve better survival. So, different methods have tried to select effective drug before chemotherapy.Drug sensitivity screening in vitro for different chemotherapy drugs was a promising method. This study will explore whether drug screening by culturing breast cancer cells in vitro from breast cancer tissue could consistent with neoadjuvant chemotherapy in patients.40 breast cancer patients who would receive neoadjuvant chemotherapy were recruited.Breast cancer tissues were obtained before chemotherapy. The breast cancer cells were cultured in unadhesive dishes. Chemotherapy drugs were put in dishes and drug sensitivity were evaluated. Patients received operation and pathological evaluationc after neoadjuvant chemotherapy. The results of drug sensitivity in vitro and pathological evaluation after neoadjuvant chemotherapy were compared whether they were consistent.

Inclusion Criteria:

• invasive breast cancer candidates for neoadjuvant chemotherapy agreed to participate in this observative experiments could receive operation normal liver and renal function

Exclusion Criteria:

• inflammatory breast cancer recurrent breast cancer

Patients in this study were invasive early breast cancer patients who were candidate for neoadjuvant chemotherapy.