Additionally, there were 2 cases of cervical squamous cell carcinoma metastasizing to the lung, 1 case each of renal clear cell carcinoma, rectal cancer, and cardia gastric fundus adenocarcinoma metastasis to the lung, as well as 1 case of neuroendocrine tumor and 1 case of SMARCA4-deficient undifferentiated carcinoma. This evidence concerns the gene SMARCA4 and undifferentiated carcinoma.