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 has long entertained the internet with her corny jokes, but there’s one thing she’s very serious about: mammograms. In an interview with People published on Tuesday, Knowles revealed that she was diagnosed with stage 1 breast cancer in her left breast.

Beyoncé and Solange's mom Tina Knowles, author of 'Matriarch', shares her shocking diagnosis and opens up about fame, love and loss in this week's issue of PEOPLE.