LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
) O H( _. v' ^9 r1 L" M6 GTHERAPE UTIC PERSPECTIVES
1 `& y% p# C" t" h/ l3 D/ PJ. Mazieres, S. Peters' v) ^& b4 k" Q8 F
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
" H' N! D L7 j: q c' H- o. uoutcomes 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# z7 h, N) j, s$ U- x
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
' M! @ A" Q* r: itreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations t+ L, [9 a9 z
and 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;7 F1 Z( n2 Y6 B7 e7 N
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for
- t5 y; G3 z' D' i% Htrastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to4 n2 d/ E1 r5 m
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
5 }: k# ~5 Z1 Y. ~- n22.9 months for respectively early stage and stag e IV patients.
0 e9 }% y3 r( V9 F g, N* e7 a8 _Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
: ~8 ?2 v( j2 vreinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .* G* b( B1 N& c: N9 x% l
HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
; Z. b% O1 E6 \" n( ~- Y, K$ m0 Bclinicaltrials., k" h* t. z& v2 ~
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