Objective: Oncotype DX® recurrence score (RS) can be predicted from Magee EquationsTM (MS) postoperatively. The aim of this study is to investigatecorrelation of MS with RS from pretreatment core needle biopsy (CNB) tissues, and their clinical usefulness in prediction of response to neoadjuvantchemotherapy (NCT) in estrogen receptor-positive and human epidermal growth factor receptor 2-negative (ER+/HER2-) breast cancer (BC).Materials and Methods: Pretreatment CNB tissue samples from 60 patients with ER+/HER2- invasive BC were analyzed for MS and RS correlation. MS and RS were categorized as follows: low (<18), intermediate (18–30), and high (≥ 31). Percentage Tumor size Reduction (%TR) was used toassess tumor response to NCT, and substantial %TR was defined as at least 50% reduction (≥50%TR). Correlation between MS and RS, and predictivefactors for the ≥50%TR achievement were assessed.Results: MS and RS represented a strong correlation (Spearman's correlation; r=0.58, p<0.0001) as a continuous variable. As a categorical variable, theconcordance between MS and RS was 43.3%, and it increased to 80% (r=0.61, p=0.003) with the exclusion of the intermediate risk categories. Although,there was pathologic complete response (pCR), MS showed the highest predictive power for the ≥50% TR achievement, none of the factors were statistically significant (p≥0.07).Conclusion: Our study demonstrated that there was a strong correlation between MS and RS from pretreatment biopsy tissue samples in ER+ andHER2- invasive BC.