Yuan L Working Group Member Locations Ontario Home > Our Network > Yuan L Network Voices Previous Next Patient Story "Precision medicine has transformed my prognosis from extremely poor to hopeful" In 2022, Yuan Lew was diagnosed with Stage IV lung cancer. As a never-smoker, Asian, female, under 50, her physicians suspected she had mutations in the EGFR gene. Confirmation that this was the case, radically altered her treatment plan.