LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
0 E& @ v9 l" s# a; X7 YTHERAPE UTIC PERSPECTIVES
& I0 z% w7 ?* Y* m0 A% }) _J. Mazieres, S. Peters1 w, A& N# N- `& ~6 U
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
( t1 |* G8 ~/ w1 B4 ` Soutcomes 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
% M: Z0 U9 U { D! D" w6 Wtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
6 F% ?; G( \. _5 F. Utreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
8 W8 P! m4 ?7 ]% Cand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
9 M6 i) _0 y4 ~$ k* n! V( Q( |disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for4 r$ |) c+ ~ m: t4 r
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
7 B$ J% E8 M* I F% ]; C* @; _lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
+ T+ X6 S* ?& |( o1 d( I22.9 months for respectively early stage and stag e IV patients.
& G& p U) P9 W6 P# \ |& V9 aConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,1 B+ g! S$ Q7 g/ M! }7 A, Y
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
4 r) {- A" g m' \* dHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative+ E/ ?0 K: g/ O. V4 @. w8 p/ ]! J
clinicaltrials.+ G) _* J6 s; O9 f' N
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