LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
5 L. e5 C! R1 ~, m: I- G0 GTHERAPE UTIC PERSPECTIVES! o G5 l! N) s$ v' o! D# @& P
J. Mazieres, S. Peters
# y+ V* J+ m# i8 J5 gIntroduction: 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
3 k5 v! l# a8 O% P( z. J: doutcomes 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 ^; T+ X4 F' ~% ?5 E4 W0 x
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her28 c5 {# q" X5 d
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
7 b- a! H% c3 v; L O z9 C) Rand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;3 e- X. c; x+ S0 f' n! m2 i5 g" d
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for, T g: N6 ]7 u% g6 A2 B
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to, c; U: N& e) w! O& F9 R3 j
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and' G/ I; q9 B, a
22.9 months for respectively early stage and stag e IV patients.
& O% z' ?- q E+ c: B* Z1 c2 TConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,, Y! g/ b0 O! F$ y" m
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
" ]8 E" x$ T/ I1 ]: VHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
' r$ p$ |& W( e; W' Gclinicaltrials.
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