Cardiff Oncology Inc.’s mid-stage and ongoing clinical trial of its PLK1 inhibitor in colorectal cancer produced promising data but the company’s stock lost a quarter of its value on July 30 because of second-quarter losses. The randomized phase II study of onvansertib combined with a standard-of-care treatment in first-line, RAS-mutated metastatic colorectal cancer produced a 49% confirmed objective response rate at the 30-mg dose level compared to 30% in the control arm.