LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND; i. R8 U* d( p& a
THERAPE UTIC PERSPECTIVES
2 I1 M3 |$ I6 B* o8 D: UJ. Mazieres, S. Peters. s) f$ I3 \) f, u, h X, M; U
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
( y6 U/ Y) d/ Z3 a. |7 w/ 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 targeted9 a8 X, i9 l4 R
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2( ?4 D* Q8 f! S9 g" S# f/ g
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
% \' `" \* ^* vand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
% m1 R; k+ D( ?+ j+ D: n$ ?- tdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for# `# P+ R4 n. u4 }, X6 N
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to; x4 N7 F( g' ^. |/ W
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
5 y9 ^/ x1 L( Y6 c u22.9 months for respectively early stage and stag e IV patients.
$ W* i. ]* ^5 \. P6 U& J/ bConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,1 s& ~ _- S; B$ _. C
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
2 s- _" m5 F4 R& dHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
" @5 \7 Y3 n$ Z; Fclinicaltrials.
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