Clonal Origin of Tumor Cells in a Plexiform Neurofibroma with LOH in NF1 Intron 38 and in Dermal Neurofibromas without LOH of the NF1 Gene

LOH at the NF1 locus was investigated in 38 neurofibromas of 26 NF1 patients. Only in one of these tumors LOH was observed. In this plexiform neurofibroma of a NF1 patient with a constitutional one base-pair insertion in NF1 exon 4b, a non-random X-inactivation pattern was found, strongly suggesting...

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