LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
8 c4 ?) A. N- T: v3 v* y* aTHERAPE UTIC PERSPECTIVES6 J. I9 [: |7 n3 e v
J. Mazieres, S. Peters
% N8 f( A: h/ c* m$ p/ C! {/ T# XIntroduction: 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
" D( m( |7 B) Boutcomes 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+ Z' E2 X9 ^; \7 d; S
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
# Q& Q' k5 {" R5 e2 j1 _3 F Xtreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
8 M" K y' q9 i5 ~: Mand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
0 D L, Y% u( adisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for5 I1 ^3 Z( H+ R0 N% ~
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
# O$ G; ~0 R" z2 a1 `lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and% N4 M) _( x7 u
22.9 months for respectively early stage and stag e IV patients.4 H( M4 _+ a6 g6 M4 M& B* s
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
}6 C- T, a- _) s q( |7 S4 O7 f; Dreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
, x) N5 }& l) a, lHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
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