LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
3 ?7 g# V4 c; ]! R) d3 t( {THERAPE UTIC PERSPECTIVES) I6 ]9 _) I! x
J. Mazieres, S. Peters8 {0 M6 o8 M5 {7 T. 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
- r0 s4 b5 R/ `* @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( d* Z6 Q0 ], m
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2& F4 f% Q/ f; O$ i
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
$ \0 K. H) l0 d/ M& o6 aand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
1 s5 B( @* Q- E" C; \disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for9 u. t0 C1 z( d
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to# o! P$ F- Q i- `' h3 T
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and6 \9 d9 d2 [6 Y, g9 E" d
22.9 months for respectively early stage and stag e IV patients.: J' n8 v. Q* r9 M4 Q
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,0 c) B! v4 ]7 V% ^5 B0 {, a
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
* d" `" M$ u0 I8 j7 i$ \7 h9 T7 uHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative) y1 I/ B% y2 o, F- A. ^" c7 f
clinicaltrials.7 }( R% [, E: u5 l4 R" T
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