LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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J. Mazieres, S. Peters, X% A/ w; F0 i! 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
& n" V3 u4 J9 l- soutcomes 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) [9 j3 d$ R
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her29 m) P, _: U! o" B6 r! \
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
$ B7 b" r% t5 t$ Vand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
; M' _2 m* ^5 Q* K1 F7 h. Kdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for8 M# b# M& L5 Y, t% S/ o4 g/ }0 `, o, u4 p
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to- K; j$ A0 ], V
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and9 f( Z1 y- g* k
22.9 months for respectively early stage and stag e IV patients.
( f: U$ g3 K6 J- N+ G, G! sConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,5 o9 S( V( O& \. e4 A( I
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
& L& u0 m0 B- D5 D: g$ e# d% bHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative5 H" J/ K) U$ o' ]& w; o3 K6 q/ {
clinicaltrials.
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