We were particularly interested in the intron 19 region (I19) of ALK, since portions of I19 have been found in the mRNA transcripts of two ALK fusion genes, EML4-ALK and PPFIBP1-ALK, detectable in lung cancer and myofibroblastoma, respectively [18–22]. Here, PPFIBP1 is linked to myofibroblastoma.