LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
5 H, R" I! q+ f$ f' FTHERAPE UTIC PERSPECTIVES/ P/ ]2 J& }7 H/ R
J. Mazieres, S. Peters P3 ^0 ~) y7 Z1 f
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
+ p* ?- L% ~% g( qoutcomes 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
4 h* a# A5 b* V; Ptreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
8 n6 j; k/ D+ N! g7 [0 N, Ltreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations, ]2 e# P4 `8 ^( V6 y( N* B
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
* R" [0 `( u$ @7 d5 M# [% F, pdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for7 E' r4 |. x6 ]& q4 O
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
9 f. v7 n+ I* Z6 }# xlapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
2 |1 J6 { m# R+ B7 Y1 r; t22.9 months for respectively early stage and stag e IV patients.
. j5 { i& H1 H, GConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,# m, R) ^5 p* h. ^5 X, f6 M
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .- U" s: E; {) j; F" e0 V
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
7 [$ _8 c# b* G y$ J J5 n6 Qclinicaltrials.
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