LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND- ?; [" i6 _" B/ Q+ {. L
THERAPE UTIC PERSPECTIVES
O2 A5 I. a( |0 U8 J+ tJ. Mazieres, S. Peters) C. H. V; t( c. L! G* h( I
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) p) U; V3 S$ r3 N6 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 targeted2 Z! X7 t: Z9 Z! H, J1 G
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2, ]$ `1 Z+ C+ K+ }. \. B
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations$ l8 J+ s5 G% V& \; v: u2 _; a
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
2 N4 Z8 N8 m! R# d3 [disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
) `6 b) x3 s/ Gtrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to" S- E" n* l3 P: T! C
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and5 |- C0 \3 m# s" K' U
22.9 months for respectively early stage and stag e IV patients.. F! V% V! R! N9 ^/ q b7 Q& N
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
: W$ |; E }/ {, P0 {$ preinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .2 C7 I& O6 ~/ s6 B3 [2 z) o
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
1 j ?- a: T6 K/ G4 ]clinicaltrials.0 |0 a5 P# b' [! ~& [
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