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Adjusted relative risks of HER2‐zero and HER2‐low breast cancer (BC) by HR status with epidemiological factors. (A) Overall HER2 zero BC; (B) HR+ HER2 zero BC; (C) HR‐ HER2 zero BC; (D) Overall HER2 low BC; (E) HR+ HER2 low BC; (F) HR‐ HER2 low BC. *, missing values in the index variable were not shown.
