LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND0 _2 `& Z y6 G# G
THERAPE UTIC PERSPECTIVES
R' z) u+ m, H( u/ h' Y- U9 hJ. Mazieres, S. Peters
$ n5 G3 T' D2 i5 \- u& nIntroduction: 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: Z ~" P5 W
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/ b. V' c: ~5 N
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her29 G% y1 r9 N8 c+ s1 _0 |
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
3 h4 f! V; A+ B/ [and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;2 [. D+ E9 p* L
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for0 q, i; u# R6 \0 y$ h2 O( t
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
% }1 \* T) h7 ]lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and( J+ m) ^; F" c/ G2 }& ]' r
22.9 months for respectively early stage and stag e IV patients.6 t. W8 `3 J. t$ r2 A
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,! d" ~8 E5 a1 r9 h
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .6 m% ?- Y! E! C, S
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative4 ]' q0 [ b$ \& l- A; E
clinicaltrials.' E) L! Z7 i9 S6 R: u0 f2 J0 o; A
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