NF1 and neoplasm: The aim of this study was to compare melanocytes from unaffected skin and CALMs between patients with classical NF1 and 3bp del NF1 to determine through transcriptomic analysis (1) the overlapping basis for CALM formation, and (2) ascertain if differences can elucidate a basis for tumour formation only in classical NF1 and NF1 MM.