Abstract
Neurofibromatosis 1 (NF1), also known as von Recklinghausen disease, is one of the most common neurocutaneous genetic disorders. Loss of function of the NF1 gene results in overactivation of the RAS/MAPK pathway, leading to neurocutaneous manifestations and osseous abnormalities. Because of medical progress, molecular testing for NF1 after genetic counseling is now available in Japan. In addition, revised diagnostic criteria for NF1 were proposed by NF1 experts of an international panel in 2021. Because the overall degree of severity and manifestations in each patient are not predictable, age-specific annual monitoring and patient education by a multidisciplinary team are important for the management of NF1. Although treatment of plexiform neurofibroma has been challenging, selumetinib (an oral selective MEK1/2 inhibitor), which targets a pathway downstream of RAS, was approved in 2022 for use in children with inoperable, symptomatic plexiform neurofibromas in Japan. This article summarizes recent progress in diagnosis, clinical characteristics, and treatment of various manifestations of NF1 and proposes the future direction required to resolve unmet needs in patients with NF1 in Japan.
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