Donna Summer Died of Lung Cancer

05/18/2012 at 01:45 PM EDT

Donna Summer Dead from Lung Cancer
Donna Summer
Michael Putland/Getty
Although it was announced that Donna Summer's death on Thursday was due to cancer, in some quarters it was speculated that it may have been breast cancer.

That was not the case, her family says in a statment, giving the cause of death as lung cancer, while also clarifying that her cancer "was not related to smoking."

"Ms. Summer was a non-smoker," says the statement. "Obviously, numerous factors can be attributed to the cause of cancer in general, but any details regarding the diagnosis and subsequent treatment of Ms. Summer's case remain between her family and team of doctors."

Summer, who was 63, remained highly guarded about her condition – many of her close friends didn't even know she was sick. "Her family knew. I just think that she's private," a source tells PEOPLE.





"It's not like she was in bad shape. She was healthy, she was taking care of herself," says the source, who worked with Summer in 2008. "She was healthy and energetic when I worked with her."

The singer's family announced Summer's death Thursday, saying in a statement that they "are at peace celebrating her extraordinary life and her continued legacy."

In his own statement issued from the White House, President Barack Obama said, "Donna truly was the 'Queen of Disco.' Her voice was unforgettable, and the music industry has lost a legend far too soon."

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