ArticleJournal of Korean Neurosurgical Society2025
Genetic Basis and Clinical Management of Schwannomatosis.
Article in Journal of Korean Neurosurgical Society, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Schwannomatosis (SWN) is now recognized as a broad classification that includes neurofibromatosis (NF) type 2, reflecting their shared genetic and phenotypic characteristics. Previously, SWN and NF type 2 were considered distinct clinical entities; however, the 2022 classification revision has unified them under the umbrella of SWN, with NF type 2 now referred to as NF2-related SWN. SWN arises from mutations in NF2, SMARCB1 (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily b, member 1) or LZTR1 (leucine zipper like transcription regulator 1). Recent diagnostic criteria for SWN incorporate molecular classification, including "NF2-related SWN", "SMARCB1-related SWN", "LZTR1-related SWN", "22q-related SWN", "SWN-not otherwise specified", or "SWN-not elsewhere classified". NF2-related SWN is a genetic condition where all individuals with a germline or constitutional NF2 mutation are destined to develop the disease. The pathogenesis of SMARCB1- or LZTR1-related SWN follows a three-step, four-hit model. This involves retention of the mutated germline SMARCB1 or LZTR1 allele in the tumor, loss of the wild-type chromosome 22, and somatic mutation in the NF2 gene. Clinically, NF2-related SWN involves bilateral vestibular schwannomas, with treatment options including microsurgery, radiotherapy, and bevacizumab, each with specific benefits and limitations. Patients with SWN frequently present with chronic pain caused by schwannomas, which often does not correlate with tumor size, location, or burden. Management of SWN is primarily symptom-based. Surgical intervention is reserved for symptomatic lesions, particularly in cases of spinal cord compression or significant functional impairments. Multidisciplinary approaches to pain management are critical for enhancing quality of life. Although malignant transformation of schwannomas is a potential risk, the life expectancy of individuals with SWN is nearly normal. Despite advancements in understanding SWN, further research is necessary to elucidate the underlying genetic mechanisms and to develop targeted therapeutic strategies for this complex disorder.
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