LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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3 S2 O7 a$ B2 fJ. Mazieres, S. Peters" ~0 `" T$ P4 ^- T5 @, F
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) F# T" p8 @9 f: f
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
3 d0 |: n3 d4 b. {* J5 ytreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2" ~/ ]2 V3 x# p7 ]1 e9 [9 m
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations c$ X: w, r* |; S! y1 E3 j" d
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
p1 q1 m2 z8 z7 wdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for8 q: N; i0 t6 w. ? J& ` L
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
. A: p. d) V3 c/ A7 c ~/ k) z: [lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and. m2 h4 `1 @- I) q
22.9 months for respectively early stage and stag e IV patients.
# E8 W: Y% W- P; ]Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,: P% ]. ? ~+ o9 L' l- }+ x- E
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas ., s; ?; P, A- s. L8 d+ j
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative4 i7 h) i6 s) t+ r8 N# ?% K
clinicaltrials.
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