(CNN) With five rounds of chemotherapy, two stem cell transplants and a dozen rounds of radiation, a toddler from Kentucky has faced an extremely difficult first few months of life.

But things are finally starting to look up for 21-month-old Molly Hughes, who was diagnosed with stage 4 cancer in 2017.

The toddler's test results came back last week showing no sign of disease in her body.

"We were just so relieved," Molly's mother, Chelsea Hughes, told CNN. "She's happy and playful and just doing normal things again, but we still have to keep our guard up."

Molly was diagnosed with neuroblastoma, a type of cancer that develops from nerve cells. It most commonly affects children younger than 5, according to Dr. Kelly Goldsmith, who directs a treatment program at Children's Healthcare of Atlanta.

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