LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND0 `8 Y. f9 g$ C4 h, l# ^
THERAPE UTIC PERSPECTIVES
" ? u/ a* p- MJ. Mazieres, S. Peters5 l7 w5 b. h1 d0 _! S C6 F+ j
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 therapeutic9 i0 ^# w) ^! o
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% R5 d7 I5 r4 H5 I- m
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
6 R4 e l, y- M% v1 X, i4 Atreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations% n/ |- a0 j9 T5 ~
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;% }6 x' _) V& h) O# x$ _
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
: O8 [. d2 k' S `3 }& Rtrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
: ?1 ^7 B1 |- |9 D. O ]& Y" p3 N- klapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and4 J3 h( x4 p' ^$ ?* X
22.9 months for respectively early stage and stag e IV patients.
( t- ~: m& n% W1 v9 J! pConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
! a f* y7 ?! s2 d. P ereinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .0 C8 y: b& N7 G5 }
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
; V3 i7 S7 C/ c4 E: K# I. ~clinicaltrials.. C. w$ @4 l7 c! C8 J
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