Tina Knowles, the mogul and mother of musicians Beyoncé and Solange, may have a calendar peppered with glamorous engagements and to-dos, but there’s one routine appointment she wishes she hadn’t missed: A mammogram.

In "Matriarch," a memoir from Tina Knowles, the mother to Beyoncé and Solange Knowles reveals she was diagnosed with breast cancer last year. "I've always tried to take care of myself. I just… was in disbelief,

Tina Knowles has revealed that she recently battled breast cancer - but with Beyoncé and Solange by her side, she had all the support she needed until she finished her treatment. On the day of her memoir Matriarch‘s launch Tuesday (April 22),