LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND- _ E/ m( @$ q( G/ b
THERAPE UTIC PERSPECTIVES
[. U7 O: G* \4 j j; VJ. Mazieres, S. Peters
+ C3 ]' Z Z5 U; b& IIntroduction: 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" [4 C2 M1 y, x, ~# p2 U
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
/ `- B1 u. R2 {$ Jtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
' X5 S/ g; n* ^treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations$ ?' g, ]' Y; q* d8 r5 d0 ]
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
7 ]1 E$ N% E! m* R( h1 e, J; }. pdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for1 ?% Z6 Q4 H+ [$ p4 a0 l0 y
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to, P# L( _5 x6 N6 z; S
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
. E$ a: c- l7 l+ a* R22.9 months for respectively early stage and stag e IV patients.
- Y u( A5 ]6 sConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,1 ~' m+ T C; W: G6 k/ x
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
, M. y2 _" Z' ~! N/ D# k/ }' fHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative& P' e0 n" y9 L4 @. |
clinicaltrials.. j* F2 @2 h) i7 [ d |( N( @
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