LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
5 m) p8 U7 ?) G1 O6 jTHERAPE UTIC PERSPECTIVES/ X/ s3 B( t0 [1 ^: s
J. Mazieres, S. Peters
: G7 j% t! K2 ]& \8 E3 w/ y5 ~9 BIntroduction: 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
" k* N( v: a( a, P+ W0 Xoutcomes 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 targeted7 a2 h# K* P- T% s+ o. p3 s
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
. Q5 j7 F# V" z: u- }treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
4 H. {; | _& _/ Y& Aand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;6 S% o3 P9 e6 |2 H2 O
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for+ ?1 _* c6 v" F0 C: H* L. `, F
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to/ l4 N1 u9 w% Y2 z6 E+ p7 O8 K6 c
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
6 p4 P$ U, j G22.9 months for respectively early stage and stag e IV patients.
* I5 l" J$ |; i) L) kConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
) G1 b6 U( I$ [( s; Q9 q& y' sreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
( s. g% T9 P ~$ A5 ], X/ gHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative) E. b% i$ O( q5 _
clinicaltrials.
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