LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
) T9 d1 Z0 s' c1 ^* W: XTHERAPE UTIC PERSPECTIVES
6 n7 |( Q8 A( Y2 E3 fJ. Mazieres, S. Peters
4 b! g% U! y, z; ?5 I4 ZIntroduction: 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' T6 d+ L! G$ r8 j" o
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 targeted
7 i* B9 ]0 ]$ E& ktreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her21 S" x3 u0 @$ G' u9 z/ m$ W
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
1 `; ^( C3 q2 k \$ x" tand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
" Y6 b# T# C2 B, [% {disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
8 r& A5 C7 ^7 Q7 T! ]; [trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to- b) e( @8 t6 o8 @
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
% H- x2 v2 S4 l: B+ S22.9 months for respectively early stage and stag e IV patients.
" l) r) l: R7 h4 J4 gConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,9 W7 r% i8 J' l6 v
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
% U" `8 U! L9 @- `HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative4 [* }! V( F3 u8 x7 I8 P& }
clinicaltrials., D6 s" R' q! G; W7 ^- p
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