CD274 and lung adenocarcinoma in situ: To examine a larger range of tissues for PDL1 expression, fresh-cut lung cancer tissue microarrays containing 192 separate cases of lung cancers were purchased from U.S. Biomax, Inc. This array (S47) contained 78 cases of squamous cell carcinoma, 69 cases of adenocarcinoma, 3 cases of mucinous carcinoma, 7 cases of bronchioalveolar carcinoma, 5 cases of adenosquamous carcinoma, 4 cases of atypical carcinoid, 15 cases of small cell carcinoma, and 11 cases of large cell carcinoma.