7:15 PM PT -- Gladys just told TMZ, "I'd like to clarify that Aretha and I discussed both of us having cancer, mine was stage 1 breast cancer and hers was pancreatic. Due to early detection, I am cancer-free and grateful for that."

Gladys continues, "It is unfortunate that on a day we should be celebrating Aretha's life and massive contribution to our world, a reporter who did not relay accurate information has missed the message. I send my love to the entire Franklin family and my gratitude to them for sharing such an extraordinary person with us."

1:45 PM PT -- Knight's publicist, Jay D. Schwartz, tells TMZ ... Knight does not have cancer, and she's doing fine.

Another music legend, Gladys Knight, seems to have revealed she's battling pancreatic cancer ... and Gladys says she and her friend Aretha Franklin discussed it the last time they spoke.

Gladys was attending Aretha's funeral in Detroit Friday when she told WDIV about their final conversation. Gladys says they happened to be staying in the same hotel, and when they sat down to chat, she says ... "At that time we shared the fact that we had the same disease."

Aretha died 2 weeks ago from pancreatic cancer.

Gladys, who looked great at the funeral, is 74 years old. She did not say how far a long her cancer is.

The Rock and Roll Hall of Famer performed at Aretha's memorial concert Thursday night.