Complex sentence: A smaller subset also have mutations in the genes LNK, CBL, TET2, ASXL1, IDH, IKZF1 or EZH2; the pathogenetic contribution of these mutations is being studied.
Split into simpler sentences: A smaller subset also have mutations in the genes LNK, CBL, TET2, ASXL1, IDH, IKZF1 or EZH2. The pathogenetic contribution of these mutations is being studied.