Tina Knowles reveals 'biggest lesson' she learned from cancer diagnosis Tina Knowles was diagnosed with breast cancer in July 2024 before being given the all-clear nine months later. 4 May 2026 Tina Knowles learned to "stop being so codependent" after her breast cancer diagnosis. Tina Knowles has opened up on the impact of her breast cancer battle The 72-year-old matriarch, whose daughters are Beyonce and Solange, has opened up on the "biggest lesson that came from" her health struggle after she was diagnosed with stage 1 breast cancer in July 2024.