CD274 and thrombocytopenic purpura: Regarding platelet count that was significantly lower in those with higher PD‐1 expression, a study done by Elif et al [16] who measured serum PD‐1 and PD‐L1 in patients with idiopathic thrombocytopenic purpura (ITP) revealed that there was a positive correlation between serum PD‐1 levels and platelet count, which needs further studies to correlate serum PD1 and platelet count in AML patients.