LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND6 C" w% S4 Q5 |, K/ k
THERAPE UTIC PERSPECTIVES" |$ m$ [6 r' B/ K
J. Mazieres, S. Peters
% C" c1 v5 @ T9 q! `2 LIntroduction: 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
" H. f+ b3 q! c! U" Y$ qoutcomes 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/ R7 g6 |: V D2 Z& s
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2+ |. j# R7 t% [: v
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
2 c! _4 N+ G: G. H5 v, C0 c# Band 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;+ i+ S- \1 J& u/ m9 J
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for5 J# j& P6 x. J( ]. k4 U; @
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to. ]# b1 `; C3 P0 Z6 v: J! y
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and3 n; _7 Z* f! a1 l
22.9 months for respectively early stage and stag e IV patients.$ x# b, x; C4 d [2 o5 z3 r
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,, e- L1 ~9 |1 ?: j$ {/ `
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
% v% f) J* v% P2 EHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
( L& @) P# S# A* G) f; u4 I; yclinicaltrials.
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