LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
/ V- d2 w( B& B% E+ k7 @1 FTHERAPE UTIC PERSPECTIVES
8 G+ u0 k! O3 v; J7 rJ. Mazieres, S. Peters9 J/ [ h+ [. `
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 therapeutic9 |7 U# U: s- x3 P' O& M
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
n a4 e: P* D4 \" x; _: Jtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
: N" p$ x0 E, K1 Rtreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations" X( K, U/ c; T% n/ R8 U; q
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
+ ?: r6 _1 k3 C# ^# X5 qdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for4 i" Q' V' M [ |0 U1 n$ Y J
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to3 c) T. {: ^% I4 d
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and0 E- a @' U4 s
22.9 months for respectively early stage and stag e IV patients.+ g0 a- a/ {5 ?: ?) ]3 q# }
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,6 U0 T$ d: e9 m# R: }9 Y- \
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
! h* z& O# j" P) w( P& Z# cHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
. y8 n5 ~2 Q [ H6 iclinicaltrials.1 w! L* y7 e2 c+ P" t) K- [3 G
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