LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
& B) }9 [- V+ V% h. \( q. [. LTHERAPE UTIC PERSPECTIVES
( B( u9 Z0 L% J* H. r- W' M) pJ. Mazieres, S. Peters
$ ?, I! A+ ]. \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
& L( W! n/ @( h8 [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
7 r% q* o- `- D* L: u3 g" F" qtreatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
. |# ^5 O% J* ~+ M2 @6 \1 \treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations- [% l# t) X9 j, D
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;5 P2 _2 W8 m1 `9 b% k1 t. C6 w
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
; b7 C2 I6 S L0 l5 {- Otrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to6 T& C9 g3 W1 R
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
P8 X- x7 B" ~' ~22.9 months for respectively early stage and stag e IV patients.
$ ?5 `( F D& u7 O$ q7 ~Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,/ F( g4 i& z N- Z. K: |2 M
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .$ n0 S) T) B) o" B0 t3 } N
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
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