Children who have survived cancer once may develop new tumors, researchers say.

According to the study published in the Journal of Clinical Oncology, one in twenty of more than 14,000 kid survivors developed a new cancer during the study.

The researchers also found that survivors whose second tumor was non-melanoma skin cancer were twice as likely to get another aggressive cancer in the next 15 years compared to survivors with a different second tumor, Reuters Health reports.

“It [skin cancers] could be a marker for patients at significant risk,” Dr. Gregory Armstrong of St. Jude Children’s Research Hospital in Memphis, Tennessee, told Reuters Health.

“We have been aware now for a couple a decades that children who beat their first cancer may be at risk of developing second cancers, largely as a result of the treatment they receive,” said Armstrong.

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