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P1.15 - Treatment in the Real World - Support, Survivorship, Systems Research (Not CME Accredited Session) (ID 947)
- Event: WCLC 2018
- Type: Poster Viewing in the Exhibit Hall
- Presentations: 1
- Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
P1.15-05 - The Frequency and Spectrum of EGFR Exon 20 Insertions in NSCLC: A Global Literature Review (ID 11975)
16:45 - 18:00 | Presenting Author(s): Victoria Crossland
There are limited epidemiological data on non-small cell lung cancer (NSCLC) patients with non-classical (uncommon) epidermal growth factor receptor (EGFR) mutations. In light of ongoing development of TAK-788, we describe the global frequency and spectrum of EGFR exon 20 insertions in NSCLC based on a comprehensive literature review as well as highlight possible regional variations.a9ded1e5ce5d75814730bb4caaf49419 Method
A literature search was conducted to identify publications reporting the frequency of EGFR exon 20 insertions in unselected NSCLC patients. PubMed and ASCO, ESMO, and IASLC meeting abstracts were searched up to April 2018 using the following keywords: non-small cell lung cancer, epidermal growth factor receptor, exon 20, insertions and uncommon mutations. Only publications in English were included. The pooled frequency of EGFR exon 20 insertions for each country were determined, and insertion variants (where available) were described at the global level.4c3880bb027f159e801041b1021e88e8 Result
A total of 26 studies from 25 countries were included, reporting on 569 patients with EGFR exon 20 insertions among 41,321 NSCLC patients. The highest mutation frequency was seen in China (2.9%) and the lowest in Indonesia (0.1%). When pooled by country, exon 20 insertions were found in 0.1−2.1% of all NSCLC.
Over 50 insertion variants were reported, covering amino acids 761−774. The most commonly detected mutations included D770_N771insSVD, V769_D770InsASV, H773_V774InsH, H773_V774insNPH, and A763_Y763insFQEA.8eea62084ca7e541d918e823422bd82e Conclusion
The frequency of EGFR exon 20 insertions was 0.1−2.1% of NSCLC patients, with a high variability in both length and position of insertions within exon 20. Currently, available data are sparse and come primarily from studies based on single-center experiences, with data gaps across several large geographic regions and populations. Results also indicate a need to further explore underlying geographic variations in epidemiology. Larger, multi-center global studies will further help to refine the frequency of exon 20 insertions and other uncommon mutations in NSCLC.6f8b794f3246b0c1e1780bb4d4d5dc53
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