LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND( Y/ |! y( e/ m0 B+ R
THERAPE UTIC PERSPECTIVES/ {; Z1 ?2 D2 g8 J% k2 Q. b
J. Mazieres, S. Peters) Q+ i$ D; v' I1 Q# [
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
# g# R3 O7 {0 N, Houtcomes 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
2 G5 \1 d( f( p- N( streatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
& m5 q) i0 u) j$ ktreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
2 `7 J: m* h$ {1 E, ?3 fand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
/ ? f9 ^& _. [% R7 Q! j9 d1 V3 ydisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for9 N5 z k3 p3 m- a1 j! N5 {
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to/ O! z' W& w6 f y+ [! b& J
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and; u: W3 D- k+ X$ m& X1 L3 P# t8 D
22.9 months for respectively early stage and stag e IV patients.
9 Q7 _0 V9 y& ? V( P7 E3 g: `2 ]8 wConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
; J0 j( l# N: `2 H5 Dreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
& e9 t! L- }, Y/ d0 ?4 P& T& ^HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative8 V7 ~# L4 j: N' M7 M! _" j
clinicaltrials.
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