'Even within one rare disease, many subtypes can exist that require personalized approaches to therapy. As one example, EMA’s chief medical officer Steffen Thirstrup mentions cystic fibrosis, which affects around 1 in 2,500 babies born. “When I left medical school 30 years ago, we knew that cystic fibrosis was caused by a genetic defect, but now we know that different mutations in the genome can cause this disease,” he explains.'
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