LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
( n7 C$ r' g8 l) w) Z& |THERAPE UTIC PERSPECTIVES
2 L& d6 T7 W' D0 M# GJ. Mazieres, S. Peters
6 x% Y( M# ]5 a; ]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
! Y( M' j+ z* w4 b! uoutcomes 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
- `4 z( O) t3 `; Itreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
3 G( G( V5 B+ W. G7 |- k, |$ ttreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations* i4 Z3 k$ u- a3 j2 F
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;' m" L+ x, q4 {
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
9 g* f- ~7 @7 _trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
6 r) ]: @/ b! I6 ^$ Blapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and3 O3 E2 U% G9 R
22.9 months for respectively early stage and stag e IV patients.
' F- f& g2 ^' ~8 F V2 G7 mConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
; l; [. L% Y+ g& e( ?( D" Preinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
9 e* h. W* s% IHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative; i" ~9 M* C/ w/ x& S$ }% o( G
clinicaltrials.% p, b9 h/ N( t* D) M! R
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