LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND( T8 q3 `8 p5 L6 h v
THERAPE UTIC PERSPECTIVES
; n) w- p& ?) F( {, `J. Mazieres, S. Peters6 z/ N7 |; V+ J, o% j
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: W. l+ C8 y K! t) k2 d% ]6 I
outcomes 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 targeted ?; a! [* x) o2 i3 ]% W
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her25 N# t4 p- j+ m7 \2 y
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations, L4 X* `/ } R# m, E z: _
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
1 ?, [" z6 S# w7 Z+ Z. C+ Udisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
8 j- [+ C; j9 F0 Ctrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to' m! |" m& g: V6 K( W3 z- [
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and3 C4 F- w! ]# t
22.9 months for respectively early stage and stag e IV patients.
, {. f0 z" ] e/ I# cConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,! v' ^2 D' p/ W; T7 H
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .3 H1 N N0 b2 b. D
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative: N. I2 O6 v" e
clinicaltrials.
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