LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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& c7 ~: F. L, b4 X aJ. Mazieres, S. Peters# t# Y( O/ F' Q( j. D! 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 therapeutic
& @* }' y, w! ~; g, loutcomes 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* M1 U3 W- ], r& `+ T6 S, F
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2. V0 R0 R+ W! s) I$ i3 x
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations) G4 D9 _+ F( L+ n
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;4 F/ z" `( W" B# K% R! l
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for# [" E+ v* Y- W( k; o, o; S
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to) j# y8 `/ W- b P" Z
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
w, ]8 T J9 L+ a6 f2 Y22.9 months for respectively early stage and stag e IV patients.
" Q+ G8 l4 ?7 w; {Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,9 F1 C& ?" ~8 D' G# z4 s \
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas ., D3 d% y7 v* B$ r5 B
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative: S& o% T* {$ |: O
clinicaltrials.
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