LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND5 E' U8 P; ]7 J" k- ^
THERAPE UTIC PERSPECTIVES+ S7 K8 H, e' @3 ?" ?* a& C6 y
J. Mazieres, S. Peters( q% y7 x+ M2 W! a( x2 c
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
* X" Y. M: g; t% ^8 Q+ q4 x8 j Soutcomes 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
# Y9 C1 x0 {9 xtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2( o: C6 R6 ?% h: N$ u% |
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations3 U3 V) {: `% n% k$ L" n4 i
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
4 Y9 m2 i8 W+ g5 Vdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for$ u; J) t6 x" F1 ~
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
* ?5 m! W2 m( y1 Llapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and: ]6 w: `' [; X+ g9 k0 T) J9 ?
22.9 months for respectively early stage and stag e IV patients.
6 O! i$ g( z* Q; ^5 S/ dConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
4 w4 t# P! h4 l# areinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .9 S! z+ R$ J# M3 \0 ?
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative9 y0 d4 H2 }/ @6 U
clinicaltrials.
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