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Effect of Neoadjuvant Chemotherapy on Hormone and Her2neu Receptor Expression in Breast Cancer Patients—a Prospective Cohort Study

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Abstract

Breast cancer accounts for 27% of all cancers in women in India. Treatment of these patients is influenced by expression of tumor biomarkers. There have been recent reports that neoadjuvant chemotherapy (NAC) results in alteration in the expression of hormone receptors (HR) and Her2neu receptors in breast cancer. The aim of this prospective cohort study was to study the effect of neoadjuvant chemotherapy on expression of hormone and Her2neu receptors in breast cancer patients. Forty patients with biopsy proven breast carcinoma planned for neoadjuvant chemotherapy were included in the study. Their receptor status before and after NAC were recorded and studied. The mean age of our 40 patients was 48.3 years. 72.5% of the patients were in stage 3, 27.5% in stage 2, and none in stage 1 and IV. Patients (12.5%) had change in estrogen receptor (ER) after NAC, of which in 2.5% the ER changed from negative to positive. Patients (17.5%) had change in progesterone receptor (PR) after NAC, of which in 5% the PR changed from negative to positive. Twenty percent of patients had change in Her2neu after NAC, of which in 10% Her2neu changed from negative to positive. Total changes in receptor status were seen in 20 receptors, in 17 out of 40 patients. We recommend revaluation of HR and Her2neu receptors after NAC as a significant number of patients switch from negative to positive receptor status after NAC, and these patients might benefit from the additional therapies which would otherwise have been withheld from them.

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Correspondence to Shaji Thomas.

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Kundaikar, J., Thomas, S., Aggarwal, K. et al. Effect of Neoadjuvant Chemotherapy on Hormone and Her2neu Receptor Expression in Breast Cancer Patients—a Prospective Cohort Study. Indian J Surg 83 (Suppl 2), 504–510 (2021). https://doi.org/10.1007/s12262-021-02901-3

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