Sharon Osbourne has long had a fear that she is just recently sharing with the media. She is terrified of dying of Alzheimer’s disease, the way her father did. Ozzy Osbourne’s wife lost her father, Don Arden, to the disease back in 2007 at the age of 81.

“I was terrified because my dad died from Alzheimer’s. It is the most soul-destroying disease. To see someone you love come down with it… it’s wicked, it really is,” Osbourne said during a recent interview. “There is nothing I can do to prevent it, nothing. People say to take cod liver oil and do puzzles and things, but then I look at people diagnosed with dementia.”

“My father was super active mentally, and take Margaret Thatcher, Ronald Reagan… they were all so active, and that’s what really frightens me,” she added.

Sharon Osbourne and her husband recently shared with the media that they both underwent genome testing. In doing so they learned that Sharon has two of the four genes that are responsible for Alzheimer’s disease.

'It's a wicked disease': @MrsSOsbourne left 'terrified' after medical tests http://t.co/whtMfuFcm2 pic.twitter.com/bK6aeOBUTh

— HuffPost UK Ent (@HuffPostUKEnt) January 19, 2015

“Ozzy and I had these tests done at a university in England, and the results took three months to come back. They test every single cell, chromosome and gene in your body; it’s like a DNA test but a million times more sophisticated,” a terrified Osbourne shared.

“The results showed I have two of the four genes that give it to you. They’re not the two major genes, but they’re still there and I have them,” she said.

Sharon Osbourne is already a cancer warrior. The former X-Factor judge battled colon cancer that spread to her lymph nodes. Two years following her treatment, she founded the Colon Cancer Program at Cedars-Sinai Hospital in L.A. She learned during this recent genome testing that she also has a high risk of developing breast cancer.

Sharon Osbourne clearly has a lot on her plate–and on her mind–at the moment.

She takes time to joke, however, about her husband, Ozzy Osbourne. Once known for his life of booze, drugs, and even eating the heads off baby bats–the rocker’s tests came out remarkably clean.

“So Ozzy had it done and, unbelievably, he came out so clean. He came out allergic to alcohol, coffee and dust. Dust! He is so healthy, it’s ridiculous,” Sharon said.

At least Sharon Osbourne’s sense of humor is intact. And humor–along with optimism–can be key in surviving any illness. Hopefully Sharon Osbourne never develops Alzheimer’s disease as she fears she will. Between now and them, however, strides could be made toward further slowing down the disease or perhaps one day even curing it.