LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND; @2 k$ r# G0 w+ A% X
THERAPE UTIC PERSPECTIVES* K% u% ^4 V" \: f- U
J. Mazieres, S. Peters
4 X! C5 k" C* ZIntroduction: 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% j8 I) s2 E7 `+ k
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
. _; ^" c: f) u/ _" y( H' `# `0 ]4 ttreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
5 U( @$ D! k# U/ Q# m( Etreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
5 G: B5 j j `( p/ [and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;; ? n; _/ X& ]# T
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for& ~* d4 h& s" R1 o" F9 \
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to I; T8 {- Q+ p
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
. i2 l' O. n3 X0 A22.9 months for respectively early stage and stag e IV patients.; G7 m0 B. h/ c' ~. x: R. X; i
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,* X- B- l# g; f) [: i
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
7 }+ ]% A6 H9 ~! X/ c4 u( UHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
2 o) O7 y$ [ [; n6 g. |4 T3 F1 y, Jclinicaltrials.2 ?* v; ?) N5 N6 ~- L8 {4 |
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