MKI67 and breast cancer: Regression analysis showed that the elastic modulus value (odds ratio [OR]: 5.841, 95% confidence interval [CI]: 3.714–6.112, χ2 = 9.143, p < 0.05), Ki-67 expression level (OR: 3.522, 95% CI: 1.865–3.897, χ2 = 7.744, p < 0.05) and molecular subtypes (OR: 4.331, 95% CI: 2.552–6.714, χ2 = 8.556, p < 0.05) were risk factors for a low pCR rate in patients with BC.