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. 2021 Nov 17;54(4):1081–1090. doi: 10.4143/crt.2021.890

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Copyright © 2022 by the Korean Cancer Association

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 2 — Survival analysis between different estrogen receptor (ER) subgroups in early stage invasive ductal carcinoma patients. Difference in 5-year recurrence-free survival between ER^high/ER^low/ER⁻ (A), ER^high/ER⁻ (B), ER^high/ER^low (C), and ER^low/ER⁻ (D) patients. ER⁻, estrogen receptor negative; ER^high, estrogen receptor high positive; ER^low, estrogen receptor low positive.