Chromosome 17q11.2 Deletion Syndrome, 1.4-Mb, also known as chromosome 17q11.2 deletion syndrome, 1.4mb, is related to chromosome 17q11.2 deletion syndrome and neurofibroma. An important gene associated with Chromosome 17q11.2 Deletion Syndrome, 1.4-Mb is DEL17Q11.2 (Chromosome 17q11.2 Deletion Syndrome). Affiliated tissues include heart and bone, and related phenotypes are axillary freckling and cognitive impairment