Guardant Health, a laboratory known for conducting cancer screening tests, has experienced a significant data breach affecting patient information. The breach originated from a file that contained personal details of patients, which was unintentionally made available on a publicly accessible online platform. This file included sensitive information such as names, ages, medical record numbers, treatment information, and test results collected in late 2019 and 2020. Importantly, the file did not contain any financial information or Social Security numbers.