LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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- o+ F* \. u* Z8 Z* }" AJ. Mazieres, S. Peters
# y% N1 J( Y$ \, f# E2 f4 yIntroduction: 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
. m$ J5 F! R5 _: ^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 targeted3 l. K2 d+ N9 J, W" K. ^5 h
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2 M6 ~* g1 W+ a% l7 w7 e2 W; C
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
) y+ j- j4 X4 P& E5 G1 D! ?, o: [. Gand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
7 [ ?; }" R$ P, q# I6 Tdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for/ p* F( u3 D# P0 R$ N' b! T# E
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to, _2 S, x' C( J% A2 R
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and- A% V# Y4 ^3 s d5 r# v; H% g
22.9 months for respectively early stage and stag e IV patients.8 W3 {& `2 V1 E! A' t: I3 K
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,) H4 W- u, n, p/ h3 n! N- C
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
/ P, q% a8 @) H% L; w3 }* jHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative3 }) c N3 J1 A4 Y- m, c# G
clinicaltrials.
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