Age less than 40 years showed marginally significant predictive findings for IBTR in invasive cancer patients.
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Comparison of ipsilateral breast tumor recurrence after breast-conserving surgery between ductal carcinoma in situ and invasive breast cancer.
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Although the differences of survival curve did not reach statistical significance, the 5-year overall survival and distant metastasis-free survival of invasive cancer patients who suffered IBTR were inferior to those without (84 vs. 98 % and 63.3 vs. 96.5 %, respectively).
LN positivity ( p = 0.03) and experience of IBTR ( p < 0.001) remained as highly significant in multivariate analysis for predicting OS and distant metastasis-free survival.