Fig. 4: Linear regression of ERBB2 copy number measured by NGS and FISH in uterine serous carcinoma (n = 24).

Cases with heterogeneity in HER2 expression (n = 9) are indicated by ×, those without heterogeneity (n = 15) are marked by •. Linear regression including all cases is a gray line, while the regression excluding cases with heterogeneity is a black line. Dashed line is CN = 6.