LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
# k0 E5 n0 ]! a bTHERAPE UTIC PERSPECTIVES' v. v/ ~ A: K* O" k- X
J. Mazieres, S. Peters# D3 g! Q/ S5 d9 K# 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% p) r6 C7 h5 B- G U" g
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, Q" i& i/ ^3 }+ r* j' G, Z# p
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2, J( `* G n) Q; D. ? k4 @% X' R3 Z& }
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations+ T+ w% M9 W9 B ]2 ~2 X
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
5 f; L1 d1 v: z; Z' t3 K3 Xdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
# M3 ~9 t2 y) ~3 H3 g& D, Ytrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to, k: C; c) e2 p- L& G0 X' J
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and2 _$ P# w* O* E! h7 ^# m D/ \
22.9 months for respectively early stage and stag e IV patients.+ I w% S9 @2 D3 s) @
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,6 E3 m9 ~7 R: c, H6 W& P1 I
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .. s- Q) _ p7 H2 A
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
3 S+ E/ d+ F6 c0 Aclinicaltrials.
9 }; b6 U% A! ?6 X |