TIGIT and small cell lung carcinoma: Increased immune‐related markers were also confirmed in SCLC‐V subtype, including cytotoxic function mediated genes such as GMZA, GMZB, and IFNG; immune cell inflamed genes such as CD4, CD68, and CXCL9; and immune checkpoint molecules such as CD274, TIGIT and LAG3 (Figure 5I).