Biocept, Inc. is a molecular oncology diagnostics company that develops and commercializes proprietary clinical diagnostic laboratory assays to identify rare tumor cells and cell-free tumor DNA from blood and cerebrospinal fluid (CSF) in the United States. Its cancer assays help healthcare providers identify oncogenic alterations that qualify a subset of cancer patients for targeted therapy at diagnosis, progression, and monitoring to identify resistance mechanisms. The company offers assays for solid tumor indications such as breast cancer, non-small cell lung cancer (NSCLC), gastric cancer, colorectal cancer, prostate cancer, pancreaticobiliary cancer, and ovarian cancer. It also provides cerebrospinal fluid tumor cell and ctDNA and ctRNA testing services to medical oncologists, neuro-oncologists, surgical oncologists, radiation oncologists, urologists, pulmonologists, pathologists, and other physicians, as well as clinical trial and research services to pharmaceutical companies, biopharmaceutical companies, and clinical research organizations. Biocept has collaborations with CLEARED4 to develop a system for tracking and managing COVID-19 testing requirements and results for its customers, and with Protean BioDiagnostics, Inc. to research the ability of its Target Selector molecular assay to determine EGFR status in NSCLC patients. Incorporated in 1997 and headquartered in San Diego, California, Biocept filed a voluntary petition for liquidation under Chapter 7 in the U.S. Bankruptcy Court for the District of Delaware on October 13, 2023.