LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
/ r0 v1 _& i! STHERAPE UTIC PERSPECTIVES
4 l& @/ ^5 G; c VJ. Mazieres, S. Peters) ^- f% o" {* g
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
' f6 N! `7 \7 Coutcomes 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& D& O$ q$ v6 @- Y8 u
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her25 R/ S9 w: o( D3 \2 X2 i
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations* o2 U3 l7 C' g v
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;) j5 @0 k/ a' N; G/ g3 g5 A4 I
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for7 f2 Q3 {3 p3 M# F- v. @
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to/ `) l. i J0 I5 \1 H. y
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and; |5 ^8 A1 d* J" Y0 c- s$ [
22.9 months for respectively early stage and stag e IV patients.
% K4 l7 w8 x$ R ]3 iConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
. v+ I4 W) S% p e3 g( D. ereinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
4 i; f0 ?( ~+ e0 p9 R: v2 y5 @HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
: x0 s/ I# G' `, x7 a! s% I# jclinicaltrials., t; m1 }3 S" T+ H0 p: D( b- h; Q
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