It was 10 years ago that 2-year-old Caroline Watters of Queens was diagnosed with leukemia and got a lifesaving bone-marrow transplant from her 4-year-old sister — and they marked the anniversary in May by trying to help others.

Their parents threw a party to celebrate the fact that Caroline, now 12, has been cancer-free for a decade. She and her sister, Lisette, now 14, urged guests not to bring gifts.

Instead, “we asked them to donate money to The Leukemia & Lymphoma Society so one day they’ll raise enough funds to find a cure for leukemia, lymphoma or any kind of cancer,” Caroline said.

Caroline, who plans to be a cheesemaker and a vet, and Lisette, who hopes for a career in the fashion business, won a 2011 New York Post Liberty Medal in the Young Heart category for telling their inspiring story once or twice a month to help raise awareness and funds for blood-cancer research.

Lisette “rejoices” at her sister’s 10 years of good health and said, “I want other people to have that same joy that we have.”