Catherine Zeta-Jones, wife of cancer-stricken actor-producer Michael Douglas, says she's "furious" that doctors did not discover her husband's throat cancer until it had progressed to stage 4.

Douglas, 65, had explained on "The Late Show with David Letterman" Tuesday that he had suffered persistent throat and ear pain and endured a battery of tests in early summer, but was only diagnosed with cancer in early August, after a biopsy.

"He sought every option and nothing was found," Zeta-Jones, 40, told People magazine in a story being published Friday. She said she and Douglas both had their suspicions before receiving the diagnosis.

"It wasn't a huge shock," she said. "I knew something was up. He knew something was up."

Zeta-Jones, who won a supporting actress Oscar for "Chicago" (2002), said Douglas, a two-time Oscar-winner for acting and producing, broke the news himself to their children Dylan, 10, and Carys, 7.

"Daddy sat them down and told them he has throat cancer now," she said.

For her, "The hardest part is seeing his fatigue, because Michael is never tired." But both remain hopeful that the radiation and chemotherapy being used to treat a tumor at the base of his tongue will prove successful, she said, adding that Douglas is determined. "[I]f there's anything Michael has, it's strength."Douglas said his wife and two youngest children - he has a son, Cameron, 31, with ex Diandra Douglas - are at their Bermuda home while he undergoes five-day-a-week radiation treatment and tri-weekly chemotherapy in Manhattan.

Through all this, he has been helping promote his upcoming film "Wall Street: Money Never Sleeps," in which he reprises his iconic 1987 role as investor Gordon Gekko.

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