The brother of Andrew Lloyd Webber has revealed he has been diagnosed with cancer. Julian , 75, confirmed he will receive treatment after doctors told him he had prostate cancer. The cellist performed a birthday charity gala on Tuesday as he turned 75. The appearance marked his return to performing after 12 years out through injury. He performed at Wigmore Hall and revealed his health woes shortly after. He admitted he had to make his diagnosis public as he didn't want to "disappoint anyone".