LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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5 O- o: l# y/ n" ^- x! QJ. Mazieres, S. Peters
h1 R9 ^, T! O" X2 J, RIntroduction: 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
" q' P! f0 i a8 B7 a* Q2 f! N# R2 R' Aoutcomes 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 targeted9 h8 ]6 F" a$ a3 v
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
8 K5 y7 U0 j( D2 Ttreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations- B1 r) @6 d3 W; z2 W
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;: s, e4 l. r: L1 u
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for/ R7 N6 C; K# K& n% L' o
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to/ [: r( a7 p# L/ u# p5 J/ f
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and' s" o N( w0 k+ W6 j
22.9 months for respectively early stage and stag e IV patients.: H [! ^5 N/ Y) @' E8 p
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
m% w- Z, e1 K2 d' Y# Ireinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
; |* d4 t# ^3 q$ C! ZHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative! s) G( Q+ S7 H/ n y: p
clinicaltrials.
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