In February, the Palace announced that the 75-year-old king had been diagnosed with an unspecified form of cancer detected in tests following a corrective procedure for an enlarged prostate. 

Although Charles has resumed official state business, the diagnosis prompted him to postpone his public duties to begin treatment and rest. 

A Buckingham Palace spokesperson said, "His Majesty's treatment program will continue but the doctors are sufficiently satisfied with the progress made so far that the king can now resume some of his public duties. His Majesty is very encouraged to resume some of his public duties and is very grateful to his medical team for their continued care and expertise." 

"We are very encouraged by the progress so far and remain positive about the King's recovery," the spokesperson said, adding that it was too early to say how long cancer treatment would continue and when it would end.  No further details about King Charles' health and treatment were released. 

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King Charles, who has been photographed and filmed performing some official duties in private, made his first public appearance since being diagnosed with cancer last month. He greeted well-wishers with an impromptu walk after an Easter church service in Windsor, raising hopes that his health was improving. 

British Prime Minister Rishi Sunak celebrated the news of the king's return to public duties on X with the message "Great news to end the week!".

Meeting with the Emperor of Japan

To celebrate his return, Charles and his wife Queen Camilla will visit a cancer treatment center in central London. Emperor Naruhito of Japan and his wife Masako will also make an official visit at the end of June. 

However, the palace said Charles will not follow his usual summer schedule and his plans will be drawn up in consultation with his medical team to minimize the risks to his recovery.