LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
# g) ] {, ~# y3 gTHERAPE UTIC PERSPECTIVES
4 y0 ~5 q0 O& v) F" j3 DJ. Mazieres, S. Peters! U8 w4 C$ Q' e
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+ q% v6 F, H5 _% Y0 L1 q
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 targeted1 q6 i9 Y- U# C! l1 |- @ e5 K' [
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2" A% D; h: e# v* o& z. _$ N& W
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations# n( j) N" b1 q2 P; x, h/ t5 E
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;# { f: `/ J2 A$ E
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
. V% b5 W9 c$ j1 Dtrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
: g9 h/ W; k7 a7 g0 `lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
) C1 r: A+ S1 R: F8 C22.9 months for respectively early stage and stag e IV patients.
; ^ d0 u- C, l; C- q1 aConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,: O- v: f1 N, E7 G
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .7 h, u5 T( D j
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
. c+ x4 o% L+ f3 Jclinicaltrials.
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