Tumours with ALK rearrangements can harbour more mutations

The identification of potentially targetable kinase mutations has been an exciting advancement in lung cancer treatment. Although the mutations driving many lung carcinomas remain unknown, approximately 50 percent of lung adenocarcinoma cases harbour KRAS mutation, EGFR mutation, or ALK translocation, and an additional 5 percent or so have been shown to have mutations involving BRAF, PIK3CA, HER2, MET, MEK1, NRAS, and AKT. In the vast majority, these driver mutations are mutually exclusive. But in a recent study researchers have found that tumours with ALK rearrangements can harbour 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 hybridisation (FISH) and immunohistochemistry (IHC). Using the DNA extracted from formalin-fixed paraffin-embedded tumour 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 tumours, 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.’ EurekAlert