LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
6 W1 @: C$ U5 n( y5 a# e& e5 B' tTHERAPE UTIC PERSPECTIVES! h+ f; z* d/ i* B* ?$ z* g
J. Mazieres, S. Peters3 l3 U+ k( l3 e, V2 i: [0 J' [
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
5 d4 Z# I# A& m( X+ c3 @2 P6 Koutcomes 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
! u5 \- n. M k: jtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2' ]" d: S8 }& P& F% S
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations3 a8 J. n( b+ G+ {% _- g
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;/ X5 C2 e& i. ^. m
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
& _' \( [! g: O: B' m2 \, S3 ptrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to6 K. s( m5 i2 O n0 H, X( T) ?0 B) T
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
, y3 U& M7 Z0 W' e22.9 months for respectively early stage and stag e IV patients.
( F. Q3 S: Q' g) Q# AConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
% }6 ?/ g9 f9 t9 l2 y qreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
m3 N* k- B) Z& @6 }# n8 [0 aHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
5 q, s+ d" G3 u; v& vclinicaltrials.6 E) ?( [7 M, F9 v
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