LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND+ M! Y: E) G' K+ w$ A) ^
THERAPE UTIC PERSPECTIVES. e3 P8 [* ?" g
J. Mazieres, S. Peters
. ?( E, v( b; @! }: yIntroduction: 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+ z1 D1 G6 J X _3 W+ {9 w/ [' Y
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
1 M' D/ q* O5 ?2 htreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her25 G7 s" n2 Z Q# @$ D! O
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations5 B8 ^0 y# I) r, x# r
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;- h$ h! e6 O& a: s& U; D( S1 i1 b0 }
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
* |( k# B+ L3 V) k3 S8 \trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
/ q N& q7 Q% w9 \lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and9 R, f+ j z: X" a
22.9 months for respectively early stage and stag e IV patients.
}& D' K8 j3 LConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
4 [+ s6 i* Y! T. A$ Z, \reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
7 f: j+ o( H5 p" MHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative/ E2 ]# ^8 y+ [* w, f! \
clinicaltrials.3 n- \& x7 Z* q# Q0 z, M
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