LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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3 |( S5 Y0 {5 m, I( k! V( @J. Mazieres, S. Peters
, n: k+ ~. u+ t3 y& e( XIntroduction: 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+ ?6 X8 A& M1 `
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 targeted8 r8 L! P5 F7 Z$ F: O
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
( U( d% Q+ k0 a. Y) E htreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations. y! k: ~+ K8 w- U ^; N
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
, `5 g: k/ l" f( T( _; t$ ndisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for' N7 S: z8 @! u4 m
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
- J, ]+ \) U. g9 r0 Elapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and; m" G6 h* }' l7 N
22.9 months for respectively early stage and stag e IV patients.; U" d4 F( I/ _# ]: V* [
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,7 L. q: M5 ^# D0 r% X
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
( s* j8 z/ y* Y( ^9 kHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
( U* r* u% _' ^) |. dclinicaltrials.; u8 r# |5 U$ r1 G- k
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