CD274 and neoplasm: We found that 23% (27 out of 116) of human non‐IMA cases expressed PD‐L1 (Fig 4G and H), while only 8% (two out of 24) of human IMA cases expressed PD‐L1 (Fig 4G and H, excluding non‐mucinous tumor cells heterogeneously existing with mucinous tumor cells), suggesting that PD‐L1 is rarely expressed in human IMA.