LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
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! G& ?) k6 D" z2 {7 aJ. Mazieres, S. Peters3 l/ `9 S( A7 Y' Q/ M8 Z
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
- ^9 r, F1 c) Y, H8 u& b. c2 q/ b7 Goutcomes 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/ I9 v% B: D5 ^6 I9 G" \0 e$ J8 Z
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2$ n, S4 j0 U. z0 I
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations% o& H, `5 D! i7 L8 `
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;& X# g5 j; U1 ~: w' }5 N) k4 D# m
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for& D. e9 O1 r, a* C! B0 r X8 P
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to+ C$ e9 d0 j8 j9 I3 a( x- D+ V; ~
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and( a# |8 q7 z) t6 L# C" ^- X& K7 } g
22.9 months for respectively early stage and stag e IV patients.: {. T8 O3 D/ y2 y
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,/ I9 Y' U4 k: N3 M& V0 x
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .5 Q9 l/ b- q! }3 x; ]) S! n# Z
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative- @5 H9 }5 e2 u8 u5 }
clinicaltrials.7 j0 [' N" _# O: q
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