LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND6 ~: X: o' y% P
THERAPE UTIC PERSPECTIVES4 i( E. S& v3 R% u3 U5 [
J. Mazieres, S. Peters5 Z9 b" B9 t# Y, d5 ]
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 therapeutic4 [1 D! B! S- w6 X0 \* n$ I
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+ W2 n% j2 W+ e! v! w# X, w
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
0 M, J% ?$ u) ?# Atreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
0 B7 D0 K" m+ iand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
. | M3 N0 {; U/ S/ udisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for) ?: u5 U0 z/ I4 H5 s5 ?! n% m
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
8 A% D* m& }; ]% plapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
6 ?% W/ p2 l5 t7 L4 K @22.9 months for respectively early stage and stag e IV patients.1 x5 Y6 J5 Y7 d3 m7 r: C% w/ Q
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
& _ R; Y! q: U8 `4 D1 O; Q/ Oreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .% \- w! w2 J! N% p
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative/ ]6 {, P+ c/ X) T Y. d
clinicaltrials.
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