ERBB2 and breast cancer: In the comparison of HER2 0 and HER2-low BC, OS differed in adjusted models (likelihood ratio test p < 0.001) although the standardized ten-year survival probabilities were similar: 73.1% (95% CI 69.1–77.2%) for HER2 low and 73.6% (95% CI 69.2–77.9%) for HER2 0 disease.