Genomic testing—in which doctors study the unique DNA of a patient’s tumor to customize drug regimens—has become an integral part of cancer care. But to write a treatment plan, physicians must first scrutinize data from similar cases, which puts smaller institutions and patients with rare forms of cancer at a disadvantage. “To find matches, many providers need to look outside their own system,” says Ken Tarkoff, CEO of San Francisco–based oncology software startup Syapse. In 2017, Tarkoff’s company launched the Syapse Data Sharing Network, a first-of-its-kind hub for doctors from multiple hospital systems to pool their collective experience for the benefit of patients. By integrating anonymized electronic health records, pathology reports, and DNA sequencing data, the platform helps doctors nationwide identify patients like their own, and the specific treatments that have helped them. The network is used by regional hospital systems such as Washington's Providence St. Joseph Health, Detroit’s Henry Ford Health System, Colorado’s Catholic Health Initiatives, and Aurora Health Care in Milwaukee.