Actor Paul Newman watches from the pit area during practice for the Indianapolis 500 auto race in this May 10 file photo. The actor's business partner says Newman is battling cancer.

New Haven, Conn. ? Paul Newman, the legendary actor and philanthropist, is battling cancer, his longtime neighbor and business partner said Wednesday.

Newman, 83, has recently appeared gaunt in photos, and dropped plans to direct a play in his Connecticut hometown. Writer A.E. Hotchner, who partnered with Newman to start Newman’s Own salad dressing company in the 1980s, said the actor told him about the disease about 18 months ago. He did not specify what kind of cancer, but said Newman is in active treatment.

“I know that it’s a form of cancer,” Hotchner told The Associated Press. “It’s a form of cancer and he’s dealing with it.”

Newman issued a statement late Tuesday that he’s “doing nicely” but didn’t specifically address questions about cancer.

The Oscar winner appeared to have lost weight when he was photographed during practice for the Indianapolis 500 auto race last month. Martha Stewart, in an entry dated June 6, posted a photo on her blog of herself with the actor, who looked thin, at a luncheon to benefit the Hole in the Wall Gang camps for critically ill children. (The Hole in the Wall Gang was led by Newman’s affable outlaw character, Butch, in the 1969 film “Butch Cassidy and the Sundance Kid.”)

Newman won an Oscar for his leading role in 1986’s “The Color of Money.” His screen credits also include “Hud,” “Cool Hand Luke,” “The Verdict” and “Road to Perdition.”

Hotchner said Newman had an operation a few years ago. “It was certainly somewhere in the area of the lung,” he said.

Asked about his prognosis, Hotchner said, “Everybody is hopeful. That’s all we know.”

In 1982, Hotchner and Newman started a company to market Newman’s original oil-and-vinegar dressing. Newman’s Own, which began as a joke, grew into a multimillion-dollar business selling popcorn, salad dressing, spaghetti sauce and other foods.