LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
( m$ J8 m9 i+ e3 `+ k: h1 T% RTHERAPE UTIC PERSPECTIVES
7 j- d/ k1 L! Y" Z9 H- R+ M! RJ. Mazieres, S. Peters- i2 _1 P- f* `# i" O$ i
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 G9 m6 C! _1 u3 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 targeted3 d; o: E+ U/ K& Z4 u
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her28 X8 e( ~8 H& o! T8 i+ ~1 o% R
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
1 ~; c8 V6 V B! j- ~! ?and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;7 j4 f1 O0 T: W! [# i1 ~
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
1 ]$ r9 j1 Z. F2 |7 L7 V8 f: Ftrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to' Q1 ]5 H2 `! B+ G/ h7 q
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and" p/ ?: b+ d/ d1 D2 M9 o* I1 d
22.9 months for respectively early stage and stag e IV patients.
; y7 i C2 F5 N5 N. @Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,3 _2 ^+ p( X( H
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
0 |1 s# B$ B3 P+ b/ _% G4 vHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
3 K6 q W: F2 Mclinicaltrials.8 M, H% w9 J- L- G* g& z
|