LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND5 c7 h2 S9 y, w0 A" a Y
THERAPE UTIC PERSPECTIVES
5 j0 J3 g* P# }3 jJ. Mazieres, S. Peters& Y; g, p. Q7 c& U# H: x1 L# `
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 i5 m, N2 m
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; I+ e; J5 z. u2 G
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2, B. ^ |; R! @* u$ S4 u1 A! a
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
8 Q1 ]4 ]+ F8 Q8 k: F* K% yand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;' U9 X5 q* _3 A2 t7 k
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for: C: b& e4 E& p! n- n% d# ]/ ~* k9 {
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
, E% g: ~+ I9 v. r5 {lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
! |" v& C! j6 c n$ ]9 A5 L- n5 P22.9 months for respectively early stage and stag e IV patients.
+ j3 }- t: O& A1 ]6 i0 HConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
) G8 ~' P0 K( V- ~$ b- [/ areinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
9 t2 V5 E1 Z3 U L1 r4 cHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative/ ]4 s0 v) Q! G1 {8 A
clinicaltrials.
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