LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND) c7 b6 K, _3 Y2 d
THERAPE UTIC PERSPECTIVES
# Y7 t2 Q1 b) [! \/ A: i# ^9 KJ. Mazieres, S. Peters7 M* k! I$ F( H( Q# J
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
{ T$ ^1 S& V# k7 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' l/ ~5 y0 k4 S' I- _
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2* P/ P) v' O, r: s( r, @ q1 r
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations7 o7 t+ x8 c& @9 f& d
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
& Z; |1 E9 h. f( H5 qdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
! F7 N. F8 T( d3 V- etrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to9 t# i& n; r, z2 G$ K
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
9 E- i g* r: x+ g% i22.9 months for respectively early stage and stag e IV patients.
6 X( n9 j4 M* \5 l! F0 fConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,7 t% S2 m" ~. W) z$ @' @4 w9 X) C
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .1 V: m: |# }. m: W5 L
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative3 D" T4 c, g" s( h% E* h
clinicaltrials.% e* R$ p! F" ]9 F4 ^7 O
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