LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND6 n8 p6 G/ y2 x3 f( |
THERAPE UTIC PERSPECTIVES
+ o6 _5 y: \0 V. i/ Y0 c; R! NJ. Mazieres, S. Peters. w; t1 q* O( w) A5 n
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) P. w- ]& F' M4 E4 D% x' ]8 i3 u+ @
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 ?6 o5 o, C: c, e1 x
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
% @: M- G l" [treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
8 M7 E$ L1 F" j8 g1 pand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;0 b1 T$ y2 q' z- p. P- g; h
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for, z" j7 l0 n: v$ d; ~6 F
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to w3 m5 u( s/ o T4 z$ B0 c$ u
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and6 S" E7 a3 K6 x9 h* n$ T; e" k
22.9 months for respectively early stage and stag e IV patients.
, p' R4 j0 W3 h$ }! _8 v( FConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,4 F% T) [$ ~1 i9 g4 m$ v, \
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .% |8 Q c( }2 \7 X
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
# J; S+ ~9 A& j3 Zclinicaltrials.
6 t2 J2 K! J4 G! `3 ^3 k6 `! ] |