LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND1 `$ g! }% x. I7 \" n' ~! t4 B% f
THERAPE UTIC PERSPECTIVES
+ y v7 ]; C" V$ ?- z& o1 qJ. Mazieres, S. Peters, l, a# h/ Z! I8 G3 D
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 therapeutic6 ^! W! b& k* F" X
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
* e0 j- J. P2 mtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2* e5 P" k C0 m) @3 A0 X" Q7 V) w
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
2 N5 T1 p, l3 R- [+ c( m5 W4 b {- qand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;) K' n) a. n. X$ Z, L1 B7 \
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
+ N! n, K7 r" D& dtrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to, A+ B6 Q- T8 \' n
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
& d$ v8 @& L2 V; f8 y* T22.9 months for respectively early stage and stag e IV patients.: X( k! v) ]/ q
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
/ z( O. N) K7 p( l% j; g3 F$ zreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
3 A7 n( ~, Q, W7 VHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
/ I$ e4 y- e# F g2 F+ Zclinicaltrials.0 u% u% \% z# a1 a5 w) R
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