LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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7 O6 P8 m& m7 G8 Z% }: ?1 hJ. Mazieres, S. Peters
" I' _& q' C# V5 d) g5 ~Introduction: HER2 oncogene is a memb er of the EGFR family, encoding atransmembrane receptor that drives and regulates cell proliferation. HER2 mutations are identified in about 2% of non small cell lung cancer (NSCLC) , mainly located in exon 20, and appear to be critical for lung cancer carcinogenesis . Very scarce data are available to define a clinical profile of the patients harboring HER2 mutated NSCLC. We aimed to study clinic opatholog ical characteristics an d therapeutic
" v7 [ Y+ e' u: D" g- \: P# V/ L% Routcomes of patients harboring HER2 mutation in a large European series. Result s:We retrospec tively ide ntified 46 NSCLC patients diagn osed with HER2 exon 20 mut ation. HER2 mutation was mainly exclusive as only one concomitan t KRas mutation was des cribed. Our population was characterized by a median age of 60 yr (31 to 86 yr), a high proportion of women (30 vs. 16 men, 65% ), and of never smokers (24, 52%). All tumors were adenoc arcinomas (two with lepidic features). Half of the patients had stage IV dise ase at the time of diagnosis. HER2 targeted1 G6 R: _; S+ Q' t8 |0 m6 ]% L
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2. B' T, Q" x3 S1 {2 h
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations* g2 m1 ]8 X% {; @! n
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
6 B# i$ ?# f4 @+ {disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
& p+ F4 f- V: L; j7 }4 i$ Strastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
7 v' |2 R$ S5 E6 Rlapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and S. n7 d! J4 ]
22.9 months for respectively early stage and stag e IV patients.6 S6 _7 a* b" \; Y* l; r
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,3 w" z |3 H1 V' Q# \+ N
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
8 X6 Z% D7 U8 L |HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
* p) e: u4 X! R! j# X }: ]clinicaltrials.
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