LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
$ a5 m H4 v- mTHERAPE UTIC PERSPECTIVES3 f' a5 j7 o. ]$ }/ I0 | e
J. Mazieres, S. Peters
6 H* I( {+ k1 pIntroduction: 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
J0 P$ V- R$ y+ ioutcomes 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
' u. M3 o& q+ e D5 }$ rtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
. \+ X/ L+ Q, p4 streatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
7 s3 F9 s5 V+ @/ a/ q6 ]and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;- l7 y4 \9 } H& A3 H$ ^
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
: C' b1 |1 A5 l6 a4 ztrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
$ s( a d N" ^" v4 O# `lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
& X2 }3 L: z6 C22.9 months for respectively early stage and stag e IV patients.
" j/ x+ X- C1 X! g' x- x0 NConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
# {" e7 a+ v9 k2 N6 Treinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
& K( D1 u$ ]' M3 S0 h7 B+ J6 A6 zHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative2 B/ j/ t' l$ }6 G( ~( e
clinicaltrials.+ k( }1 D" q7 y
|