Japanese Hollywood star Ken Watanabe left Tokyo Saturday following successful treatment for cancer to return to New York where he is starring in the Broadway musical "The King and I".

Watanabe, star of "Last Samurai" -- for which he received an an Academy Award nomination -- "Inception" and Clint Eastwood's "Letters From Iwo Jima", underwent endoscopic surgery for stomach cancer last month and has since recovered well.

"I was in hospital only for four days and have begun working out," a smiling Watanabe told reporters at Tokyo's Narita airport ahead of his departure.

"I caused a lot of worries but now I can move forward and get down to new work and acting," the Oscar-nominated actor said.

"I want to start over by remotivating myself," he added.

The 56-year-old said he would resume his role in "The King and I" on March 17.

Last year, he became the first Japanese actor to be nominated for a Tony Award following his run in the musical.

The actor survived two bouts of leukaemia in 1989 and 1994.