LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
. B7 {) ^" S! X9 iTHERAPE UTIC PERSPECTIVES) |6 T# f* C# C- t# B2 p/ O
J. Mazieres, S. Peters
0 ~4 H; @5 e9 xIntroduction: 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
3 v! p2 _ @4 Z; I* v" P* {: X7 j% joutcomes 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' p' Y! u% t! c. F. T
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her23 P* s( t! C+ Z1 ?/ o& a, k
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
, h6 X( G% b! h) J+ `. ~6 yand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;. j% k% g/ n4 {" v# {5 j8 e Z
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
; y$ L( I) k6 y- `trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to* D1 V3 F5 n$ j# Z' m
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and* e; j+ r: U# D. J& J4 k
22.9 months for respectively early stage and stag e IV patients.2 Y8 q9 j- B, ~: d! `2 D
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
4 |$ r9 ]7 `" [7 X. O, P5 O9 {+ vreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .( R. ~: ?2 w0 \# w
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative+ c) B3 P+ i2 y9 d5 w1 W
clinicaltrials.. d, \/ h' @! E4 E0 S: o. V
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