LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
2 S- j% j4 Z9 J+ Q' G3 r, STHERAPE UTIC PERSPECTIVES
; I) f6 J# C( W" o8 k! MJ. Mazieres, S. Peters
2 M' W- N0 c7 l3 q3 `; n6 @0 fIntroduction: 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
1 b: u$ z( q7 b. A; p6 B! w9 B+ h f5 houtcomes 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 targeted9 A; {9 W" c+ J5 f' d( l( F/ C
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2) P2 Y6 ^; v! k& V8 v- c) C# T( Z
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations( N. y5 g X9 \
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
4 ?" e4 f5 f, X9 F, [- b: Kdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
2 o4 H, l# m. Gtrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
! g/ e @- b% W7 D2 Q0 S9 a2 ~& Plapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and1 \% ^: ~. I1 z. G u
22.9 months for respectively early stage and stag e IV patients.
& m/ m$ |6 X0 o6 H6 _' ZConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,5 ~, b& X7 n" n, A" [
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
0 L/ x( c) _$ |$ N9 NHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative8 J8 F7 H9 n5 d; R0 c Q
clinicaltrials.5 E7 v* R! |: Q* ~
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