LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
" d5 V8 P/ B- l. \THERAPE UTIC PERSPECTIVES
7 S6 \( G) Z) r( ZJ. Mazieres, S. Peters! v( S( m7 s! `2 g
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: o7 ] p6 z6 s( T, J
outcomes 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' ? H' c$ K8 j& }2 T3 V
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her29 { `6 Q4 f0 u7 Z) c2 N
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations3 ~9 q8 q1 f7 H, x
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
8 T3 ~/ Y+ y+ h/ D" t$ C8 I8 Cdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
9 T3 V% h' Z) q& ]6 j/ S! Q$ L2 wtrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to( s ~9 @/ N) Q
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and9 P0 Z% e0 S( c4 i# p7 m
22.9 months for respectively early stage and stag e IV patients.
8 g4 M1 h6 \* p: OConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
- P; \, J+ J- D f- B! nreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .* ]7 |# l+ F; j9 ?8 R
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
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