In the vast majority, these driver mutations are mutually exclusive. But in a recent study published in the International Association for the Study of Lung Cancer's
) researchers have found that tumors with ALK rearrangements can harbor additional mutations. Researchers looked at 25 cases of pulmonary adenocarcinoma surgically treated at Mayo Clinic between 1999 and 2007 with ALK gene rearrangement, confirmed by break-apart fluorescent in situ hybridization (FISH) and immunohistochemistry (IHC).
Using the DNA extracted from formalin-fixed paraffin-embedded tumor samples, a MassArray-based Lung Cancer Mutations Screening Panel was performed to test for 179 individual mutations in 10 genes, with positive results confirmed by sequencing. They found additional mutations in 5 of 25 (20 percent) of ALK positive cases. Four of these were point mutation in the MET gene that are of unknown clinical significance, since they may represent germline polymorphisms. However, one case had an EGFR mutation, further supporting that EGFR mutations can be present in ALK rearranged tumors, although it is rare. "Much is yet to be learned about treatment of patients with both ALK rearrangement and EGFR mutation," the authors report.
"Although some of these patients have had a good response to the EGFR inhibitors erlotinib and gefitinib, one patient reportedly showed resistance to erlotinib. Further research is needed to determine if patients with coexisting EGFR mutation and ALK gene rearrangement may have altered response to EGFR or ALK inhibitors. This will be important to determine whether these drugs should be used in a synchronous or sequential fashion to achieve maximum benefit."