LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND4 E4 p: X8 |1 I' |2 Q* M p
THERAPE UTIC PERSPECTIVES! c% j! R) M9 g) V2 f, o& A3 l
J. Mazieres, S. Peters0 I0 w9 u' {8 S3 ^! H4 {" s
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
2 t9 L/ ~) S4 t0 G5 Doutcomes 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, G1 Y# X4 h3 \! C! ~; P, ^: b9 U
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2- G' _1 \$ q0 l. D7 A' N9 h. @
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations( k( Z. q# m0 q5 w) @5 X+ P: V
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;, P; Q2 m7 J5 {) t, N1 a/ F
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for. f6 f8 l6 ?* ~5 {. T& D g
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to( W8 ]2 |( C8 Q$ e7 W/ ?* {
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
, V$ I2 n5 d* J# m7 L, b( G22.9 months for respectively early stage and stag e IV patients.
1 \) J! \. Q9 }( v" i; j7 e% cConclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
' u* F$ W# T/ v) U2 U8 w) l) G; V8 }) \reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .; l" m& ^6 j! b" H" b2 ~
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
$ z( N9 E( T1 y& D3 q$ x8 Bclinicaltrials.
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