British Prime Minister Rishi Sunak said Tuesday that King Charles III’s cancer was caught at an early stage.

Buckingham Palace announced on Monday that the 75-year-old has been diagnosed with a form of cancer and has begun treatment. The palace did not say what form of cancer the British monarch has but noted it's not related to his recent treatment for a benign prostate condition.

"Thankfully, this has been caught early," Sunak told BBC Radio. 

As prime minister, Sunak said he will "continue to communicate with him as normal."

KING CHARLES III'S CANCER ANNOUNCEMENT LEAVES PUBLIC WITH UNANSWERED QUESTIONS: ‘JUST RIP OFF THE BAND-AID’

King Charles III and Rishi Sunak

British Prime Minister Rishi Sunak says he will continue to meet with King Charles on a weekly basis. (Aaron Chown/Pool photo via AP/File)

"He’ll just be in our thoughts and our prayers," the prime minister said. "Many families around the country listening to this will have been touched by the same thing, and they know what it means to everyone. So, we’ll just be willing him on, and hopefully we get through this as quickly as possible."

According to the palace, the king has suspended public engagements on the advice of his doctors as he takes on a schedule of regular treatments, though he will continue with state business. Charles will continue weekly meetings with the prime minister and keep his constitutional role as head of state.

King Charles sitting and smiling at the camera

The palace did not disclose the form of cancer for which King Charles was receiving treatment in its statement on Monday. (Hugo Burnand/Buckingham Palace via Getty Images)

Charles "remains wholly positive about his treatment and looks forward to returning to full public duty as soon as possible," the palace said.

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"His Majesty has chosen to share his diagnosis to prevent speculation and in the hope it may assist public understanding for all those around the world who are affected by cancer," the statement added.

King Charles waving next to Queen Camilla and a priest

King Charles III is suspending public appearances but will continue with state business, Buckingham Palace said Monday. (Max Mumby)

Charles ascended to the throne less than 18 months ago upon the death of his mother, Queen Elizabeth II, in 2022 at age 96.

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The news comes as his daughter-in-law, Princess Kate Middleton, recovers from planned abdominal surgery for an undisclosed condition. The Princess of Wales is expected to resume royal duties after Easter in late March.

Fox News’ Stephanie Nolasco and Ashley Papa along with the Associated Press contributed to this report.