18-year-old Tran, suffering from constipation for 4 years, was diagnosed with juvenile polyposis syndrome caused by a gene mutation after a colonoscopy revealed a 30 mm polyp.

Thu, 43, discovered she had breast cancer, like her two older sisters.

After a decade without children, Kien blamed his wife for their infertility, only to discover he had a genetic mutation causing absent vas deferens.

My 64-year-old father has lung cancer, and the doctor recommended gene and immune testing. What are these tests for? (Minh Hoang, Lao Cai)

Four-year-old Tien Dat's world of discovery has been tragically replaced by pain and uncertainty since mysterious bruises began spreading across his body.

A 28-week-old fetus with polyhydramnios and hydronephrosis was diagnosed with a gene mutation causing urinary and diabetic issues after genetic testing.