FGL1 and lung adenocarcinoma: Gene expression analyses indicated that the expression levels of FGL1 were increased in human solid tumors, including colorectal cancer, prostate cancer, melanoma, lung cancer, and breast cancer, especially in lung adenocarcinoma, while were decreased in head and neck cancer, pancreatic cancer, and liver cancer compared with normal tissues, based on the data from the BioGPS tissue microarray database and the Cancer Genome Atlas (TCGA) database 15.