Castle Biosciences, Inc.is a molecular diagnostics company offering innovative test solutions to aid clinicians in the diagnosis and treatment of dermatologic cancers, barrett’s esophagus, uveal melanoma, and in the treatment of mental health conditions. The company is headquartered in Friendswood, Texas and currently employs 761 full-time employees. The company went IPO on 2019-07-25. The firm offers five commercially available proprietary multi-analyte assays with algorithmic analysis (MAAA) tests for use in the fields of dermatology, gastroenterology and ophthalmology. The company also offers a proprietary pharmacogenomic (PGx) test to guide optimal drug treatment for patients diagnosed with depression, anxiety and other mental health conditions. Its products include DecisionDx-Melanoma, DecisionDx-SCC, MyPath Melanoma, TissueCypher, IDgenetix, and DecisionDx-UM. DecisionDx-SCC is its proprietary gene expression profile (GEP) test for use in patients with cutaneous squamous cell carcinoma (SCC). The company also focused on chronic acid reflux related diseases, including esophageal cancer.