On Aug 7th, the U.S. Food and Drug Administration approved the first liquid biopsy companion diagnostic that also uses next-generation sequencing (NGS) technology to identify patients with specific types of mutations of the epidermal growth factor receptor (EGFR) gene in a deadly form of metastatic non-small cell lung cancer (NSCLC). This is the first approval to combine two technologies — NGS and liquid biopsy — in one diagnostic test in order to guide treatment decisions.

The Guardant360 CDx assay utilizes two technologies. The first is called liquid biopsy, which uses a blood sample to provide health care professionals with genetic information about the patient’s tumor. It is less invasive and more easily repeatable in comparison to standard tissue biopsies. Furthermore, liquid biopsy tests can be used in cases in which standard tissue biopsies are not feasible, for instance, due to the location of the tumor.

The second technology is NGS, which uses large-panel genetic sequencing, known as high-throughput tumor profiling. Compared to older technologies, NGS requires only one test in order to allow clinicians better assessment of tumor composition, giving providers an advantage in evaluating which mutations are problematic. The Guardant360 CDx assay uses NGS technology to simultaneously detect mutations in 55 tumor genes, rather than one gene at a time.

The Guardant360CDx is approved both to provide information on multiple solid tumor biomarkers and to help identify EGFR mutations in patients who will benefit from treatment with TAGRISSO (osimertinib), an FDA-approved therapy for a form of metastatic NSCLC. Lung cancer is the leading cause of cancer-related death among men and women in the United States, and NSCLC is the most common type of lung cancer. Genomic findings for other biomarkers evaluated are not validated for choosing a particular corresponding treatment with this approval. If the specific NSCLC mutations associated with today’s approval are not detected in the blood, then a tumor biopsy should be performed to determine if the NSCLC mutations are present.

The Guardant360 CDx assay was granted a Breakthrough Device designation, in which the FDA provides intensive interaction and guidance to the company on efficient device development. The FDA granted approval for the Guardant360 CDx test to Guardant Health. The FDA, an agency within the U.S. Department of Health and Human Services, protects the public health by assuring the safety, effectiveness, and security of human and veterinary drugs, vaccines and other biological products for human use, and medical devices. The agency also is responsible for the safety and security of our nation’s food supply, cosmetics, dietary supplements, products that give off electronic radiation, and for regulating tobacco products.

At present, the product of NGS diagnostic reagent based on tissue biopsy related to tumor detection manufactured by several companies like AmoyDx, Burning Rock Dx, Geneseeq Technology Inc. has approved by NMPA.