EGFR and ovarian serous carcinoma: In a subgroup analysis (Table 4), membranous EGFR expression was observed in 25 out of 80 (31.3%) serous ovarian carcinomas and significantly related to poor overall survival in this cancer subtype (log rank, p < 0.001; Figure 2B), which was confirmed in a multivariate analysis (HR 4.6, CI 1.6-13.4, p = 0.004).