Xiao Ya's mother was suffering from a terminal illness, a kind that current medical technology still could not cure. Ye Tianchen couldn't think of a better solution, so he could only ask Dean Lin to tell Xiao Ya a kind lie, which was that with conservative treatment, Xiao Ya's mother could live for more than another ten years, giving Xiao Ya some peace of mind.
Cancer, while very difficult to cure in this era, was not so difficult in the apocalypse. The simplest and most direct method was to find a Superpower User with exceptional Healing type medical superpower skills, who could use their superpowers to eliminate all cancer cells, rejuvenate the diseased area, and completely cure the patient.