LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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J. Mazieres, S. Peters6 i' }8 E4 Y5 z7 g
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 therapeutic1 F: P& `( _% N% g7 R7 L9 M8 y' 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
+ G0 X4 x8 C8 h4 ]5 ytreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her21 D6 V( E9 y& Y' S
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations6 X2 K/ Y1 w& I' `7 F
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ; n3 u( D( \2 f( A8 e: E6 e
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for5 L5 \8 p" D! R
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to0 y8 b% P1 C* V" w
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
' ?0 d- c% J/ n, U, T22.9 months for respectively early stage and stag e IV patients.
1 _) ]" N' f. E8 j7 ?Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,$ q) D9 B# L: X: {
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
9 u. j0 w# w4 b6 EHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
0 U1 j2 N7 t8 `) ]8 G Mclinicaltrials.
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