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Kate, the Princess of Wales, says she is making good progress in her cancer battle and confirmed she will attend Trooping the Colour for the King's birthday today.
The wife of Prince William, heir to the British throne, said "there are good days and bad days" in a personal message shared nearly three months after she revealed she was diagnosed with cancer.
"I have been blown away by all the kind messages of support and encouragement over the last couple of months," Kate said.
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"It really has made the world of difference to William and me and has helped us both through some of the harder times.
"I am making good progress, but as anyone going through chemotherapy will know, there are good days and bad days.
"On those bad days you feel weak, tired and you have to give in to your body resting.
"But on the good days, when you feel stronger, you want to make the most of feeling well."
Kate said her treatment for the unspecified cancer is ongoing and will be for a few more months and "I am not out of the woods yet".
"On the days I feel well enough, it is a joy to engage with school life, spend personal time on the things that give me energy and positivity, as well as starting to do a little work from home," she said.
"I'm looking forward to attending The King's Birthday Parade this weekend with my family and hope to join a few public engagements over the summer, but equally knowing I am not out of the woods yet.
"I am learning how to be patient, especially with uncertainty. Taking each day as it comes, listening to my body, and allowing myself to take this much needed time to heal."
She thanked the public for their "continued understanding, and to all of you who have so bravely shared your stories with me".
There had been much speculation about whether Kate would be well enough to attend Trooping the Colour this year.
She has undergone chemotherapy treatment for an unspecified type of cancer she announced in March after speculation proliferated on social media about her wellbeing because she had not been seen in public for several months. She has revealed few details about her illness, which was discovered after what she described as major abdominal surgery.
King Charles is also undergoing treatment for cancer but has eased back into public duties. He attended commemorations last week for the 80th anniversary of D-Day, the invasion of Nazi-occupied Europe on June 6, 1944.
Trooping the Colour is a 260-year-old tradition in which troops in full dress uniform parade past the King with their ceremonial flag, also known as their "colour".
Charles is likely to travel to the event by carriage with Queen Camilla and is expected to watch the ceremony seated on a dais, rather than on horseback as he did last year.
– Additional reporting by AP
