LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
6 {" U5 L2 i" LTHERAPE UTIC PERSPECTIVES4 `* R3 s9 L# P% ?0 r8 l
J. Mazieres, S. Peters6 D+ X7 J u1 h" ]1 o8 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
; b* R) |$ R: `9 k, A4 y3 routcomes 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 targeted5 ~; v1 n7 L: J* W, k9 }
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2) a6 C. I) M6 b: A) w. R2 o }
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
) _; b9 B, {* M- |& ~4 \8 Pand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
" u! k/ [# U" fdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
3 s" q1 t( L6 n0 N/ N4 S \. ^trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
1 }3 W! I) _& ]7 l4 G7 ]lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and! m% E/ L6 ~% ^1 o/ H. m
22.9 months for respectively early stage and stag e IV patients.
: B7 ?: G+ }3 T( t2 h; K2 n( X! jConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
! F+ N5 k" W) Z& Ureinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
! S: {. G3 `4 ]4 L: EHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
8 k5 T9 K: S- g5 ^8 I6 oclinicaltrials.1 B2 Q( q& A" ] h2 k- H) {6 c) s9 N
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