FGFR1 and neoplasm: In another tumor (PA #2), the FGFR1 p.K656E hotspot mutation was present at 32% allele frequency whereas the second mutation (p.V561M) was present at an allele frequency of approximately 50%, suggestive of the latter non-hotspot mutation potentially being present in the germline and the former hotspot mutation likely being present as a somatic mutation acquired during tumor development.