LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
0 \0 g& p" N; P l$ B6 W. L( lTHERAPE UTIC PERSPECTIVES
* I7 s# M: z6 v, L0 m& r2 ZJ. Mazieres, S. Peters
$ r% e9 _6 S9 cIntroduction: 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' d u3 z' G( w/ F4 j) n8 m, q
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- M8 B, N' R. S- n2 x
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2" e$ G2 j# i6 {$ H7 e
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations# L3 v2 j+ w. D3 t7 A8 O( E% t' l
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;& q% N4 L6 P# R7 |7 E2 s' T* P' ?
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for1 k1 P0 ^( b& t. y$ {" @
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
7 E C# s. u- |# L- D+ V* Blapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and1 Q7 c' }3 j! i7 t" V# b$ x& P
22.9 months for respectively early stage and stag e IV patients.% Z) N5 J# Y% K0 O; l% }3 p
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,% e4 k/ x' R/ i9 F0 {" L
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
; [' T" V/ ~0 ~5 V" B/ DHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
# x. Q6 N( b8 y& @" oclinicaltrials.* h% c) Z: v' k
|