Gücin, ZühalBüyükpınarbaşılı, NurGeçer, MelinErsoy, Yeliz EmineTürk, Hacı MehmetYıldız, ŞeymaAksoy, Direnç Özlem2022-06-172022-06-172022-06-01Gücin Z., Büyükpınarbaşılı N., Geçer M., Ersoy Y. E. , Türk H. M. , Yıldız Ş., Aksoy D. Ö. , - Stem cell markers: A guide to neoadjuvant therapy in breast carcinomas-, INDIAN JOURNAL OF PATHOLOGY AND MICROBIOLOGY, 2022http://hdl.handle.net/20.500.12645/30756BACKGROUND: In recent years, stem cells have been defined as the main cell population responsible for resistance to anticancer therapies. AIM: This study aims to investigate potential associations between the stem cell population and the degree of tumor regression in breast carcinomas treated with neoadjuvant therapy. SETTINGS AND DESIGN: The study included 92 patients with breast carcinoma who received neoadjuvant therapy. Tumor regression was defined based on Miller and Payne grading system. Patients with grade 1 or 2 regression on a 5‑point scale were included in group 1 (n = 37), grade 3 regression in group 2 (n = 32), and grade 4 or 5 regression in group 3 (n = 23). MATERIALS AND METHODS: Immunohistochemical staining was performed on paraffin block sections of every case using CD44, CD24, CD29, CD133, ID4, and ALDH1 antibodies to detect stem cells. STATISTICAL ANALYSIS USED: IBM Statistical Package for the Social Sciences (SPSS), version 23.0 (IBM Corp., Armonk, NY, USA) software was used for statistical analyses, and a P value less than 0.05 was considered statistically significant. RESULTS: Histologically high‑grade tumors are more common in the near‑complete/complete response group (P = 0.004). HER2‑positive tumors were more common in the complete/ near‑complete response group (P = 0.054). Tumor cells positive for stem cell markers CD44 and CD24 were more common in the poor response group (P = 0.027 and P = 0.001, respectively). CD29 expression was reduced in the posttreatment residual tumor tissue in the near‑complete/complete response group. CONCLUSION: High CD44 and CD24 expression may be a predictor of poor response/nonresponse to neoadjuvant therapy in breast carcinomas. KEY WORDS: Breast Cancers, neoadjuvant treatment, stem cell markers, stem cells, tumor regression gradeinfo:eu-repo/semantics/openAccessArticle10.4103/ijpm.ijpm_1274_21