Research on various types of cancer has shed light on the role of certain factors in tumor suppression and immune regulation. The protein PTGDS has been identified as a potential marker for lung adenocarcinoma and a target for tumor suppression in some cancers. However, the specific mechanisms and relationships between different factors, such as PTGFRN and the extracellular matrix, and their roles in different types of cancer, including pancreatic, breast, prostate, skin, and osteosarcoma, are still being explored.