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Chinese Journal of Clinicians(Electronic Edition) ›› 2020, Vol. 14 ›› Issue (12): 981-987. doi: 10.3877/cma.j.issn.1674-0785.2020.12.006

Special Issue:

• Clinical Research • Previous Articles     Next Articles

Association between MMR protein expression and efficacy of neoadjuvant chemotherapy in breast cancer

Cheng Li1, Yuanyuan Cai2, Guiyan Han3, Nan Wang2, Hui Wang3, Yuping Zhang3, Mingchen Wang2, Furong Hao4,(), Yunxiang Zhang3   

  1. 1. Department of Radiation Oncology, Laishan Branch of Yantai Yuhuangding Hospital, Yantai 264003, China;
    2. Department of Radiation Oncology, Weifang People's Hospital, Weifang 261041, China
    3. Department of Pathology, Weifang People's Hospital, Weifang 261041, China
    4. Department of Radiation Oncology, Weifang People's Hospital, Weifang 261041, China; Department of Pathology, Weifang People's Hospital, Weifang 261041, China
  • Received:2020-06-27 Online:2020-12-15 Published:2021-03-23
  • Contact: Furong Hao

Abstract:

Objective

To investigate the association between the efficacy of neoadjuvant chemotherapy (NACT) and the expression of mismatch repair (MMR) proteins in breast cancer.

Methods

The clinicopathological data of 53 breast cancer patients treated with NACT from January 1, 2016 to October 31, 2018 in Weifang People's Hospital were collected, and MMR (MSH2, MSH6, PMS2, and MLH1) in pretreatment biopsies of these patients were assessed by immunohistochemistry (IHC) in tissue microarrays (TMAs). Responses to NACT were classified as pathological complete response (pCR; grade 5), partial response (PR; grades 2-4), and stable disease (SD; grade 1) according to the Miller/Payne system. The results were analyzed using SPSS 22.0 statistical software.

Results

Of the 53 breast cancer patients included, 10 (18.9%) achieved pCR (G5), 36 (67.9%) achieved PR (G2-4), and 7 (13.2%) achieved SD (G1). IHC analysis revealed that MSH2, MSH6, PMS2, and MLH1 proteins were all expressed positively in the 53 breast cancer patients and none of them were MMR-deficient. In terms of the relationship with tumor stage, the expression of MSH6 showed a statistical difference among different clinical stages (χ2=6.09, P=0.04). Age, menstrual status, clinical tumor stage, nodal status, ER, PR, HER2, Ki-67, and molecular subtypes had no significant association with the expression of MSH2, PMS2, and MLH1 (P>0.05). The efficacy of NACT was positively associated with MLH1 (r=0.40, P=0.00) or MSH6 (r=0.37, P=0.01) expression. There was no correlation between the efficacy of NACT and MSH2 or PMS2 (P>0.05) expression.

Conclusion

Increased expression of MSH6 and MLH1 in pretreatment biopsies of breast cancer patients suggests better efficacy of NACT.

Key words: Breast cancer, Neoadjuvant chemotherapy, Tissue microarrays, Mismatch repair, Miller and Payne system

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