LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
0 h6 C4 d0 t; _: b: ITHERAPE UTIC PERSPECTIVES: V* L: x: \$ Y6 Q9 x+ x
J. Mazieres, S. Peters' x; j1 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
( f3 ^# `0 A( A, u8 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 targeted
' N- ?3 D. `' M. [2 `# |9 a$ [treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her22 c7 ^. j& W- C" ]5 ^ n" U0 M
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
4 i: p L* N0 k9 H8 x gand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
$ p; K6 w$ s8 l0 @8 }" l r' c3 W2 Idisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
9 n5 q' C* o& Z. M. ~* r7 Itrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
) N1 _( H x, `* _" a& r! x- olapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
( d) Y" ?/ Z( l22.9 months for respectively early stage and stag e IV patients., I4 ~ y6 v9 y+ T8 ~. l( I
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
" k: G, B( U4 f5 {1 m t0 M! Sreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .* J- K9 ]' g$ v/ p: {5 Z9 t
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative; Z$ m: x! f% T1 E1 \* B
clinicaltrials.
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