– Sulindac (sodium) (MK-231) is an orally active nonsteroidal anti-inflammatory agent. Sulindac (sodium) is used to reduce pain, swelling, and joint stiffness from arthritis. Sulindac is also used for the research of arthritis of the spine, gouty arthritis. Sulindac (sodium), as an immunomodulatory agent, can downregulate PD-L1 through the blockade of NF-κB signaling and modulates the response of pMMR colorectal cancer (CRC) to anti-PD-L1 immunotherapy, inhibits the development and progression of colorectal cancer CRC. Sulindac (sodium) also inhibits TGF-β1- induced epithelial-mesenchymal transition (EMT) and suppresses lung cancer cell migration and invasion via downregulation of SIRT1 [1] [2].