LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
+ [9 o/ C' F7 m9 FTHERAPE UTIC PERSPECTIVES$ b- p8 g! W2 Z- e0 |, C( j; K: S
J. Mazieres, S. Peters
9 u! R+ |2 d: P) [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
" \; k# ^9 g M% t6 L uoutcomes 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
1 N( I9 I5 p2 H$ P9 M4 m/ ^$ F8 [treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her26 @6 Q$ \# ]; Z
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations$ N) A, u# x0 I# |: W
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;; g9 L4 i5 u9 A/ T! o
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for( F. V2 k% o- h& o$ ?8 \5 s
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
: F: S( B5 z) K! G0 A3 W" V, }lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
?' I* Z) q/ t' x1 |22.9 months for respectively early stage and stag e IV patients.; y# `: j& D' M. D% |" [/ L; y
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,) M, A) J) w/ M: H
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .8 O2 d( ~3 Z3 h" r
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
& ~9 s R6 t" T5 Z* pclinicaltrials.
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