LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND' |7 U5 R& }4 H
THERAPE UTIC PERSPECTIVES+ C" E U2 v* V3 O
J. Mazieres, S. Peters1 B) q% A+ k% N H2 d/ c7 Y7 M K4 ]1 T
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# C& G& Y; T9 _
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
$ q' [8 }. T- {% utreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2( q( Z$ r8 K ~/ g$ D8 D
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations) h5 w; ]# {; }0 Y/ L+ S% h0 J
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
. b& E4 P9 b9 u+ p4 \* gdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for: A$ Q. ?* W1 ]8 ^( _
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
% b8 L9 Z) \8 a2 w4 {lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
; Q7 z9 P+ c3 s% i/ C5 n22.9 months for respectively early stage and stag e IV patients.! M& a: V% {, E. q1 R
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
7 P( N; e/ ?0 treinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
X0 A3 f m* g3 E+ [HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
( {/ d. H. l- [. G! U. w; q2 Uclinicaltrials." \, j u8 h; E/ L2 G
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