LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND/ f* L8 b7 U9 @ D8 I
THERAPE UTIC PERSPECTIVES8 b! P) F. m8 b$ }& C. M3 @6 ]- ?
J. Mazieres, S. Peters/ K; J8 N: P/ q" s# |8 @" C
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
5 `0 A1 y5 r2 ]/ K1 L, F1 a2 }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
; q( L% f2 q l6 Y0 a1 h2 ctreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
! a: z% X( O0 O' `$ s( b0 ?treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations+ h0 |3 e2 d; J
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
) M0 p; ?3 @8 X! H5 i$ `disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for6 Q$ O5 j, f! l4 o8 L6 \- N' e: p
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to/ o% o8 x' l" U
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and5 T9 o. \) g( L8 }
22.9 months for respectively early stage and stag e IV patients.
+ T5 f! J/ @$ u' }$ YConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,) C* i& D3 Y+ j7 P; i- v, |
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .5 R3 I; r# w" Y S! s* |0 {
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
6 h: }' a6 K" e3 c( }# c9 {clinicaltrials.
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