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. 2021 Apr 19;11:640268. doi: 10.3389/fonc.2021.640268

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Copyright © 2021 Hou, Zhang, Yang, Wu, Wang, Zhang, Yang, Hou, Wu, Wang, Dong, Guo, Shi and Ling

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Development of a prognostic stratification nomogram and validation of the proposed nomogram. (A) a prognostic stratification nomogram to accurately predict overall survival for T1–2 breast cancer with 1–3 positive lymph nodes. (B–D) ROC curves for predicting the overall survival in the internal and external validation at 3-year, 5-year, and 10-year, respectively. The values in brackets of Figure 2B–D represent the area under the ROC curves (AUC). (E–G) the calibration curves for predicting patients’ overall survival in the internal and external validation at 3-year, 5-year, and 10-year, respectively. USDW, unmarried/separated/divorced/widowed; Other, American Indian/AK Native, Asian/Pacific Islander; grade 1, well differentiated; grade 2, moderately differentiated; grade 3, poorly differentiated/undifferentiated; ER, estrogen receptor; PR, progesterone receptor.