The Australian Republic Movement wishes the King well following his cancer diagnosis.
National Director and CEO Isaac Jeffrey said: "A statement released overnight by Buckingham Palace announced the King of Australia has been diagnosed with cancer. This is an incredibly challenging and private time for any family.
"I thank the King for raising public awareness and hope it encourages more people to get regular check-ups.
"According to the National Cancer Statistics, 165,000 Australians were diagnosed with cancer in 2023 - 452 per day. Almost two in every five Australians will be diagnosed with cancer by the age of 85.
"It is an insidious disease which directly or indirectly affects us all, but thanks to incredible advancements by the medical community, including from our own extraordinary Australian scientists, treatments are advancing and every day we get closer to a cure.
"I wish Charles the best for his treatment, and a speedy and complete recovery. I send our thoughts to him, Camilla and their family."