LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
, D7 q G) e& P& b2 cTHERAPE UTIC PERSPECTIVES
J1 t+ p8 }1 ^% P9 HJ. Mazieres, S. Peters
5 v$ {% F; W {' P$ G# [0 u8 K$ ^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
9 {8 e, \0 w @! Doutcomes 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
% g2 ?) u1 v3 Z1 O: Vtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2; E5 g( I7 S* K& z K
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations* W. m2 i+ |9 f( l
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
) b& i/ M4 u0 g) E; c- r! N" E# idisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for. j' Q2 D3 b, v
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
+ |. m0 h8 A6 T$ Olapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
0 I$ Z, M" j! J* q22.9 months for respectively early stage and stag e IV patients.
+ i: p0 Y: z# j: x) e0 d7 C# ^Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
3 ?) u- g/ i) ?9 r; P" m. j- P5 greinforces the importance of an HER2 screening strategy in lung adenoc arcinomas . h/ V: g: b. a! T7 u% p
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
0 ]2 b0 J) Q0 D# c7 _clinicaltrials., U5 y0 ^" _0 P4 y. x! W
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