Donna Summer Died of Lung Cancer

Donna Summer

Michael Putland/Getty

updated 05/18/2012 AT 12:00 PM ET

originally published 05/18/2012 AT 1:45 PM ET

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.

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