CD274 and carcinoma: A Kruskal-Wallis H test showed that there was a statistically significant difference in PD-L1 status between the different drug histological grades, χ2 (2) = 7.308, p = 0.026, with a mean rank PD-L1 status of 91.82 for well differentiated, 84.74 for moderately differentiated and 105.79 for poorly differentiated carcinomas (Table 1).