LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND, S0 {# b3 n# f* K9 T0 m4 @1 Q
THERAPE UTIC PERSPECTIVES# S1 H6 @* L6 l$ d0 |
J. Mazieres, S. Peters
7 E. a8 V3 O6 J, V8 ]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
+ A, v) d5 d/ y6 P7 k3 ?* F8 q4 B0 xoutcomes 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
4 a0 w! N8 ? R& K# V' o) Itreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2* O$ K+ c% N# J+ j! _( Z4 F
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
/ z. ~1 i; C7 W9 Jand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;: W2 K8 f2 D5 p# W& `" ` S
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for& O1 g0 h8 g/ v- y4 U1 m+ r
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
5 P4 c. T9 y- F* j5 ulapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and* r1 @4 y0 a B
22.9 months for respectively early stage and stag e IV patients.
' i6 M0 W/ B8 ?. t; kConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
+ i* d0 A" h1 w6 greinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
7 V8 J$ D- b" |0 @6 s4 [8 kHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative# c/ \0 D! S& R4 R8 t$ x
clinicaltrials.
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