PDCD1 and neoplasm: The same applies to the presence of high numbers of PD-1 positive cells in the tumor (≥ 50) (median 22.1 ± 16.7 months for PD1 ≥ 50 versus 8.3 ± 2.8 months for PD1 < 50, p = 0.020) (Fig. 2C).