ERBB3 and cancer: In ovarian cancers, HER3-low/zero cancers had an unreached OS (95% confidence interval (CI), 4.4 to 73.3 months), while HER3-high cancers had an OS of 40.9 months (95% CI 12.5 to 30.1 months), with a hazard ratio (HR) of 0.41 and a 95% CI of 0.13–1.24.