Ryuichi Sakamoto, the musician and composer who wrote the film scores for Merry Christmas Mr Lawrence and The Last Emperor, has been diagnosed with throat cancer.
He has cancelled all upcoming appearances and says he is concentrating on "regaining my health".
Writing on his official website, the 62-year-old founder of synth pop pioneers The Yellow Magic Orchestra, said: "The first wealth is health, and hence this bitter decision. I would like to apologise for all of the burden I will undoubtedly be casting upon everyone who has been working with me on various other projects . . . I promise to return after a full recovery."
Doctors identified the cancer in June, and Sakamoto has had to pull out of a major concert to mark the first annual Sapporo International Art Festival in Tokyo.
"It deeply upsets me to have to cancel this concert during a time of celebration," he wrote.
The prolific Sakamoto has collaborated with artists including Brian Wilson, David Byrne, Aztec Camera and Iggy Pop, and received an Academy Award for scoring 1987's The Last Emperor.