Dr. Chance is Kate’s primary oncologist after she is diagnosed with APL. Since he begins treating her at age two and is still overseeing her care when she is 16, he knows the Fitzgeralds quite well and is deeply invested in Kate’s situation. He is shown to be patient with the Fitzgeralds when they get upset, especially Sara, who occasionally lashes out at him in her grief. He testifies at Anna’s hearing, arguing in favor of Anna donating a kidney to Kate and claiming that all the procedures Anna has undergone for donations have been of minimal risk.