LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND3 K2 X) q/ [6 N h# {% u
THERAPE UTIC PERSPECTIVES
& F( g* M# E9 Q6 s# e- wJ. Mazieres, S. Peters% A% V: r: j7 X
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
3 _% j) }$ ~9 z- E/ E6 Q) voutcomes 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. w% `3 S8 e4 A
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
# n0 P: i4 \1 M0 mtreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations; D& M5 `- M7 _' f5 D1 R( s
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
8 P% j, z% U o' I6 F* U- `disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
" H- S2 p S1 g: U7 btrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
; d1 ?" _. n% R8 w# olapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
4 o3 L+ f9 e% `( b22.9 months for respectively early stage and stag e IV patients.0 O* I# [ D `
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
, ]9 _) v+ P; K5 D3 [reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
2 _" u, a I. j7 ?* b4 bHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
8 [2 D6 ?* y/ M- o h [clinicaltrials.% g G4 H' X$ {; ?, ?
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