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Course of PD-L1 expression in serous EOC comparing (A) primary tumor tissues of the ovary (P) or metastatic peritoneal implants (I) to tumor recurrences (first recurrence, RI or second recurrence, RII) (y-axis, ratio of positive cases) and (B) a scheme showing the course of PD-L1 abundances of all samples individually, connected if samples are from the same patient (blue circles represent relative frequencies at each position).
