LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND. _0 v4 T0 H$ J& B8 s" L
THERAPE UTIC PERSPECTIVES
' M5 k8 Y+ [ K& N0 S) SJ. Mazieres, S. Peters2 G3 K2 C. F+ L- @8 w, u9 e
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" e/ S0 D8 f" U b5 z
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+ n4 y1 q0 s, V/ T* a
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
1 Y; W' V% G/ r1 {treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
0 t4 k0 G( y0 L S3 B5 Fand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
* Y+ S( e# N( Q6 a& Ydisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
9 I7 y2 [! S: C- Vtrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to1 V9 `1 V1 P- {0 k, f3 t( R
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
, r5 N" a/ ~7 i6 U$ M22.9 months for respectively early stage and stag e IV patients. C* {6 e! O5 ~' `
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,$ P- {" v0 c9 {5 C1 G
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .. J A8 \2 ]; a; e7 A0 W% G
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative& h1 I5 t s1 }/ u% X
clinicaltrials.. M0 v$ U4 @# @8 h9 b4 Z+ F
|