Tina Knowles shares how a missed mammogram may have led to a delayed detection of breast cancer, and opens up about the support from her daughters, Beyoncé and Solange, niece Angie Beyincé, and bonus daughter Kelly Rowland.

Tina Knowles wants women to stay on top of their mammogram appointments. In an interview with People, Knowles revealed she was diagnosed with stage 1 breast cancer in her left breast last July.

Tina Knowles, mother of Beyoncé and Solange Knowles, is opening up about a recent health issue. The author of a brand-new book, "Matriarch: A Memoir," Tina Knowles spoke with People about her recent breast cancer diagnosis and subsequent recovery in an interview published Tuesday.