FSTL1 and lung adenocarcinoma: The expression of FSTL1 is reduced in various types of cancer, such as cancer of the prostate, ovary, endometrium, pancreas, kidney, nasopharyngeal carcinoma and lung adenocarcinoma in comparison with healthy tissue [17,18,19,23,32,44,78,79,80,81,82,83,84,85,86].