marginally significantP = 0.05
The univariate analysis using the Cox regression model showed that IM was not a risk factor for tamoxifen resistance (HR 1.06, 95% CI 0.21-5.25, P = 0.94), but PM was a high risk factor for tamoxifen resistance, and it was marginally significant (HR 5.59, 95% CI 0.93-33.5, P = 0.05).