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Background Breast cancer (BC) is a major health problem in Egypt and worldwide. Its prognosis depends not only on tumor stage but also on tumor biology. Aim of the Work To correlate the percentage of expression of Ki67 with the clinical outcomes of early hormone-receptor positive for postmenopausal breast cancer patients who are receiving adjuvant tamoxifen Material and Methods we retrospectively reviewed 52 patients treated for non-metastatic postmenopausal breast cancer with adjuvant tamoxifen at Ain-Shams University hospital, Clinical Oncology department between January 2010 and December 2015. Ki67 value and other clinicopathological data were retrieved. Results Out of 52 patients fulfilling research criteria, the age rannged from 45 to 71 years.All patients were stage0-ΙΙΙ. Stage II was the most common represented 38.5 %, while Stage 0 was the least common presents 3.8%. Using a ki67cut-off value of 20, patients were stratified into two risk groups; the low risk group had ki67 &amp;lt;20 % and represented (67.3%) of cases and the high risk group were ≥ 20% and represented 32.7%. The median Ki67 value was 12.00 (IQR 5 – 20).Median DFS was 42.5 months (IQR 31.2 – 57). Median of OS was 49 moths (IQR 34 – 58).Among multiple prognostic factors Stage, luminal A subtype was significantly related to better OS and DFS In our study, there was no difference regarding OS and DFS between low and high ki67 group’s results ρ = 0.308 and ρ = 0.064 respectively. Conclusion Ki67 is not a predictive factor for resistance to adjuvant tamoxifen in post-menopausal female breast cancer patients.

Role of Ki67 in predicting response to adjuvant tamoxifen in postmenopausal hormonal positive breast cancer patient