C2i Genomics helps doctors and patients fight cancer by providing doctors and patients with tumor burden information, starting with only a blood sample. Its service, called C2, uses software that performs pattern recognition on data from whole-genome sequencing of the blood sample. Physicians can use the service to monitor their patient’s response to treatment and detect treatment failure or disease recurrence well before they would do otherwise. Physicians can also use the service to measure treatment response in clinical trials.