LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND) |+ E5 q2 X; D9 o- b
THERAPE UTIC PERSPECTIVES
) ^: e: u) S# OJ. Mazieres, S. Peters6 S: e- r1 M8 M. Y! e0 L" |
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
+ M7 O b W5 Y+ d3 Zoutcomes 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 j* F9 w8 e! c% Etreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her22 I! |- E4 m# T# j! N' P; R
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations% X* v% @ J0 y1 J9 a# v- _
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;# z1 R! s O/ n6 {9 O6 ?4 i$ |9 M
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for, _3 ]1 y* Z7 w+ \: ?3 @0 Q
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
! Z& Q) k! N/ _% p+ N; W- B7 z) elapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
h X) [' ^0 ?2 K. D22.9 months for respectively early stage and stag e IV patients.
1 A8 o( y8 v9 V+ h- C' [1 pConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
, q& W0 o6 |. W( Preinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
& B5 e; _! \8 [+ `3 X! x* p$ gHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative& G' }* \! S' a! [& W8 t2 A1 `6 y
clinicaltrials./ L1 f/ a2 s T6 V
|