LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND, e# k) f- B; ^7 L* E1 M" v
THERAPE UTIC PERSPECTIVES# L2 a# c% K" m7 i
J. Mazieres, S. Peters8 X) u' x2 C! L2 p2 {7 h: P
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
1 A- g4 d7 B" H+ k0 l8 s6 C; X9 voutcomes 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) Q7 {1 d! d0 o. \1 {! n
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her20 K% V$ m3 s+ g4 \0 E. `
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations: I6 ^; t! t p! S4 ~5 P' v
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
1 Q0 W! {6 @! zdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
( b$ N% z0 G% ` Y+ M9 r2 t2 M3 rtrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
& Q7 E% S* b% l6 A6 p2 F/ t- Zlapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and9 D/ Z0 o, s6 K( I. y
22.9 months for respectively early stage and stag e IV patients.
3 O0 c% h, Z; ]7 OConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
" x. m, y, i! X/ P" t8 r3 m: lreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
4 B8 `" d) Z/ GHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
. h" Y3 S) w" ]. V( {( tclinicaltrials.
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