London CNN —Catherine, Princess of Wales, will not be returning to royal duties with an appearance at the Colonel’s Review, a military parade in London in early June, as she continues her treatment for cancer. It is not yet clear if Kate will also miss that annual military spectacle – a highlight of the royal calendar full of pomp and pageantry – at Horse Guards Parade in the British capital. Following the announcement, a royal source told CNN that she would not be returning to frontline royal duties until she has been cleared to do so by her medical team. There had also been speculation over whether King Charles would participate in next month’s Trooping the Colour as he continues his own cancer treatment. Charles announced his own cancer battle in February but recently resumed public-facing royal engagements as he continues his treatment.

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Persons: London CNN — Catherine, Princess of Wales, Kate, James Bucknall, King Charles III, Chris Jackson, King Charles, Ascot Landau, Queen Camilla, Charles Organizations: London CNN, Horse Guards Parade, Irish Guards, Rapid, Corps, Coldstream Guards, CNN Locations: London, Wales, Buckingham, Ascot