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- W2947701085 abstract "3564 Background: Acquired resistance to anti-EGFR therapy in metastatic colorectal cancer (mCRC) has been characterized by a circulating tumor DNA (ctDNA) signature including any sub-clonal RAS mutation, co-existing RAS mutations, or co-existing EGFR mutations. Here, we investigated if fusions in ctDNA are associated with this anti-EGFR signature for CRC patients (pts). Methods: 4289 advanced stage CRC pts underwent molecular profiling using a plasma-based NGS assay that included FGFR2, FGFR3, RET, ALK, NTRK1, and ROS1 fusions. Available clinical histories were reviewed. Correlations between fusions and clinicopathological features were measured with a Fischer exact test. Relative frequencies of genomic alterations were compared between fusion-present vs -absent cases with an unpaired t-test. Clonality for a given alteration was called for a relative variant allele frequency (rVAF) > 50 %, while subclonal was defined as < 50% rVAF. Results: 44 unique fusions were detected in 40 (1.1%) of the 3808 pts with alterations present: RET (N = 16), FGFR3 (N = 12), ALK (N = 10), NTRK1 (N = 3), ROS1 (N = 2), and FGFR2 (N = 1). Relative to non-fusion variants detected, fusions were more likely to be subclonal (OR 8.2, p < 0.0001). Mutations associated with a previously reported anti-EGFR resistance were found in FGFR3 (7/12 pts), RET (7/15 pts) and ALK (5/10 pts). In fusion-present cases, co-existing RAS mutations were more likely to be subclonal than non-fusion cases (OR 14, p < 0.0001). EGFR mutations were more common in fusion present cases (OR 3.7, p = 0.0001) and predominantly subclonal (97%). EGFR mutations aggregated to ectodomain sites (85%) previously linked to acquired anti-EGFR resistance. For 27 pts with available clinical histories, 21 (78%) received anti-EGFR treatment prior to ctDNA testing. Conclusions: Actionable fusions using a ctDNA NGS assay were predominantly subclonal and co-existed with subclonal RAS and EGFR mutations. These clinicopathologic features are consistent with a previously validated signature linked to resistance to anti-EGFR therapies in CRC. We hypothesize that fusions may arise as a previously undescribed mechanism of acquired resistance to anti-EGFR therapies in CRC pts." @default.
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- W2947701085 date "2019-05-20" @default.
- W2947701085 modified "2023-09-27" @default.
- W2947701085 title "Association between gene fusions and anti-EGFR resistance signature in colorectal cancer." @default.
- W2947701085 doi "https://doi.org/10.1200/jco.2019.37.15_suppl.3564" @default.
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