LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
& s5 c; ]+ }6 f2 D. T, `1 g$ }THERAPE UTIC PERSPECTIVES: I$ R v1 ], |' s/ }1 F+ x
J. Mazieres, S. Peters/ Q) p+ J/ ^5 S/ m
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, b& N# Q* [1 J! c" w4 k
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
/ V8 ]$ i2 z& Qtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
1 h# e) Z0 z! A' ^9 K: Ftreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations* V+ `% E" Z9 a( j
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;8 l9 ^* g0 ]) F0 |, W
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
6 K# ?0 ? G7 h1 j. P6 `8 E0 Atrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to: U* l B. Q% Q9 R) r$ y0 d
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and* {( o) @5 `0 V, b! x6 W
22.9 months for respectively early stage and stag e IV patients.$ t' [& u" p4 M3 F8 y
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,! K" I# T5 z1 r5 q1 _
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .% L1 @5 Z' `( E. d% A
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
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