Beyonce's father, Mathew Knowles, reveals he has breast cancer

Mathew Knowles is sharing his story. 

Beyonce's father has breast cancer, he shared with Good Morning America's Michael Strahan in an interview that will air on Wednesday. A promo posted on Twitter on Tuesday promises Knowles will open up during the sit-down about his diagnosis and fight against the disease, and well as his family's reaction to it. 

"How was it to tell your family about the diagnosis?" Strahan asks in the clip as a somber Knowles gathers his thoughts. Viewers will have to tune in to Wednesday's episode to see Knowles' response. 

Reports surfaced years ago that Beyonce and her father were feuding, but Knowles -- who managed Destiny's Child -- told ET at the time that there was nothing but love between them. 

"These dangerous rumors defame my family name," he told ET in 2015. "They have no validity and hold no merit."

"There are many other important topics needing America's attention," he added. "No one needs more unnecessary negativity. Media like this needs to get on higher ground. I, for one, am focusing on lectures and seminars that help people achieve something positive and achieve better lives."

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Beyonce and father Mathew Knowles together
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Beyonce and father Mathew Knowles together
LONDON - JANUARY 21: Actress Beyonce Knowles and her father Matthew arrive at the UK premiere of "Dreamgirls" at Odeon Leicester Square on January 21, 2007 in London, England. (Photo by Dave Hogan/Getty Images)
LOS ANGELES, CA - NOVEMBER 18: ***EXCLUSIVE*** SInger Beyonce Knowles and her father, Matthew Knowles in the audience during the 2007 American Music Awards held at the Nokia Theatre L.A. LIVE on November 18, 2007 in Los Angeles, California. (Photo by Kevin Winter/AMA/Getty Images for AMA)
Mathew Knowles, Tina Knowles and Beyonce Knowles with hosts Rocsi and Terrence (Photo by Johnny Nunez/WireImage)
Sisters Solange Knowles-Smith and Beyonce Knowles and close friend Grammy? Award-winning artist Kelly Rowland join their parents Mathew and Tina Knowles close friend at special August 2 hometown screening of Bring it On: All or Nothing, in which Knowles-Smith stars. In celebration of the August 8th DVD release, Universal Studios Home Entertainment hosted a hometown screening for Knowles-Smith, one of the stars of the high-energy, attitude-filled comedy about a cross-town rivalry that builds to a no-holds-barred faceoff. (Photo by Bob Levey/FilmMagic)
NEW YORK - JUNE 23: (EXCLUSIVE) (L-R) Singer Beyonce Knowles (C) poses with her father and manager Matthew Knowles and her mother Tina Knowles at the "Beyonce: Beyond the Red Carpet auction presented by Beyonce and her mother Tina Knowles along with the House of Dereon to benefit the VH1 Save The Music Foundation June 23, 2005 in New York City. The exhibition will showcase 18-24 costumes worn by Beyonce chronicling her film, television and video appearances. (Photo by Frank Micelotta/Getty Images)
Tina Knowles, Mathew Knowles, Michelle Williams, Kelly Rowland and Beyonce Knowles of Destiny's Child (Photo by M. Caulfield/WireImage)
Beyonce Knowles (R) and father Mathew Knowles during The 47th Annual GRAMMY Awards - Arrivals at Staples Center in Los Angeles, California, United States. (Photo by Jon Kopaloff/FilmMagic)
Mathew Knowles and daughter Beyonce (Photo by Dan MacMedan/WireImage for NARAS)
Tina Knowles, Beyonce Knowles and Matthew Knowles (Photo by Jim Smeal/Ron Galella Collection via Getty Images)
Beyonce Knowles (C) and her parents Tina Knowles and Mathew Knowles (Photo by KMazur/WireImage)
WEST HOLLYWOOD, CA - FEBRUARY 27: Beyonce and father Mathew Knowles attend Sony Party for 44th Annual Grammy Awards on February 27, 2002 at Morton's Restaurant in West Hollywood, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
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