LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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4 I0 U0 ]& m* Q! I" lJ. Mazieres, S. Peters) O" c1 _7 Q6 S4 t
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$ B! C3 y; w% {' | p
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! q8 w% m+ t9 i7 P V
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her29 V1 W ^5 [% Y- S: n7 I& |& M
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations* a. T8 R( O0 |& Q0 Z2 E1 S
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;& G m5 ^' X; ~ a$ N. S& u6 G
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for) d) p/ O) e- o" Q
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to4 |& ^6 E" F; R$ J
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
+ f" }7 i% B$ I22.9 months for respectively early stage and stag e IV patients.
+ D* c/ K6 k% F8 p& {Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,: ^6 |7 a6 Z2 V
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
% Q8 p& b% O0 z6 Q; y6 ^: hHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative- q: Z; \$ E& l& B
clinicaltrials.
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