Changes of mRNA caspase-3 after first cycle of chemotherapy as biomarker associate to chemotherapy negative response in locally advanced breast cancer

Abstract

Background: Problems caused by behaviour of biology molecular in locally advanced breast cancer still unpredictable. This study aims to identify the mRNA caspase-3 as a predictive biomarker associated to chemotherapy sensitivity following neoadjuvant chemotherapy (NAC) in patients with locally advanced breast cancer.

Methods: Open biopsy before and core biopsy after first cycle neoadjuvant chemotherapy of 62 locally advanced breast cancer patients was analysed for mRNA caspase-3 by Reverse Transcription - Polymerase Chain Reaction (RT-PCR) and this was correlate with response to NAC using American Joint Committee on Cancer (AJCC) creteria.

Results: The total mean of mRNA caspase-3 expression before chemotherapy was 12.51±3.03 and after chemotherapy was 11.64±3.13. Negative response to chemotherapy was 44 (70.96%) and positive response was 18 (29.03%). The result of data with Phi and Cramer’s V analysed showed that decrease of mRNA caspase-3 after chemotherapy first cycle as a risk factor to chemotherapy negative response in patients with locally advanced breast cancer was significantly (p = 0.007).

Conclusion: Decrease of mRNA caspase-3 after chemotherapy first cycle correlated with chemotherapy negative response in patients with lacally advanced breast cancer.