STORY HIGHLIGHTS

• Spokeswoman confirms Andrew Lloyd Webber has prostate cancer
• Condition in its "very early stages," according to spokeswoman
• Award-winning composer has produced more than a dozen musicals

(CNN) -- Andrew Lloyd Webber, the award-winning composer and producer of more than a dozen musicals including "The Phantom of the Opera" and "Cats," has been diagnosed with prostate cancer, a spokeswoman said Sunday.

"The condition is in its very early stages. Andrew is now undergoing treatment and expects to be fully back at work before the end of the year," the spokeswoman said in a written statement from the London-based public relations firm Brown Lloyd James. They released no further details.