Kate made a "strictly private" visit in December o personally deliver gifts to the people involved in her treatment.

Kate Middleton didn't wear her engagement ring that once belonged to Princess Diana at the Royal Marsden Hospital in London on Jan. 14. Inside why and more about Princess Kate's new ring.

Princess Kate reportedly made a secret visit to the Royal Marsden Hospital in London, where she previously underwent chemotherapy treatment, before Christmas. The Princess of Wales, 43, made her first solo public engagement in more than a year on January 14,

Kate Middleton made a surprise visit to the Royal Marsden Hospital where she received cancer treatment, following her diagnosis last year.

Kate Middleton visited the Royal Marsden Hospital in London on Tuesday, Jan. 14, where she received chemotherapy treatment after her cancer diagnosis last year. See all the photos here

The Princess of Wales made a surprise return to the Royal Marsden Hospital to personally thank staff who looked after her during her cancer treatment on Tuesday. At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.

Princess Kate Middleton opened up about the side effects of chemo when she visited the Royal Marsden Hospital in London, which is where she received treatment amid her own cancer battle. The Princess of Wales,

Princess Kate revealed this week that she had been a patient at the hospital last year during her cancer treatment.