LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND! V k; s5 F2 T
THERAPE UTIC PERSPECTIVES% c, P1 O: U: c7 V
J. Mazieres, S. Peters: w- ]' N1 L% h: r4 U" 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
( z- y _% @; h3 xoutcomes 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 targeted8 q7 j9 `* g# x! n. z
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2
) I3 c1 w+ e) |) [0 W1 q; \' x4 Mtreatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
+ B* q a/ v& w. z# G! O, U Rand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;( ?7 A, X. d! R" M- T9 S' H$ L0 y, A
disease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for% ^- E0 c6 A8 Z: C. l. V
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
4 W" U( I9 c/ b; C% D0 b" ]lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
: ?( J2 H' {& P9 N% `% C& d22.9 months for respectively early stage and stag e IV patients.& J; l7 ?1 v' ^: t
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,
5 w+ g8 a9 ]4 Q) F$ ~( V- @reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
" P9 c0 `6 K. p, F5 O2 ?HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative7 x1 V6 h3 n/ Z! E, p+ R; N
clinicaltrials.1 Q5 d9 @# e- A: b! w: ]9 m
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