LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND& s; q+ R/ m' u& z0 U+ G
THERAPE UTIC PERSPECTIVES) R& \* B% K) f
J. Mazieres, S. Peters! |5 D( N8 \% X- `
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
9 d2 P& m _2 e( u+ toutcomes 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
4 ^8 e8 [3 b' otreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her26 y/ e8 n2 O5 o% v
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
3 a4 L) |" h }and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;; T& O4 M) D$ X
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for5 d3 {) @: j6 G$ x
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
' R0 d3 I* u9 m7 @2 l+ x# Wlapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
+ ^# n- X! I$ ~9 U( _22.9 months for respectively early stage and stag e IV patients.
5 n3 l* d) `7 F- U3 j: c) PConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
. L, L m! f L/ ?" z7 Q4 preinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .9 a) N. v' S: L0 ?
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative7 M3 \$ ]5 y; @7 E/ V2 }
clinicaltrials.
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