eFFECTOR Therapeutics, Inc., a clinical-stage biopharmaceutical company, engages in the development of selective translation regulator inhibitors (STRIs) for the treatment of cancer. Its lead product candidate is Tomivosertib, an oral small-molecule inhibitor of MNK1/2 that is in phase 2b clinical trial for the treatment of patients with metastatic non-small cell lung cancer (NSCLC). The company is also developing Zotatifin, a small molecule designed to inhibit eukaryotic initiation factor 4A (eIF4E), which is in phase 1/2 clinical trial to treat patients with solid tumors. It has a collaboration agreement with Pfizer Inc. to develop inhibitors of eIF4E. The company was founded in 2012 and is headquartered in San Diego, California.