LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND4 j& T7 J+ ?9 J5 H3 t7 Q
THERAPE UTIC PERSPECTIVES
' e& c+ e1 l' I4 ?6 X1 j" ]$ WJ. Mazieres, S. Peters6 k+ a N( M" H9 N
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
$ E7 q' u) l' N) r5 koutcomes 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
1 M { g! Z5 g [9 `) Btreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her29 ]4 X* L; |5 n8 H) `( u6 f
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations& x( E8 D& _, ~9 Y
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
+ ?- I2 \0 @- S }. S2 Xdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for3 G+ A8 z* A k0 i# f9 V9 U
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to* d# Y" A. e, {
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
" Z: K5 n, @4 d( M' H3 ~3 {0 q0 k, _" [22.9 months for respectively early stage and stag e IV patients.
- S1 U( u/ `' V$ a" Z2 `0 wConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
# z: P7 ~5 @! A; |reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
; P1 T: A. \ MHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
/ D- f0 r1 I/ [: l0 q0 e( z: a8 N, [clinicaltrials.% l9 v+ ^& L9 K
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