LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND. s g8 E/ `" _
THERAPE UTIC PERSPECTIVES3 t0 T% z$ h9 b8 L
J. Mazieres, S. Peters
- F* \( u# Q' X, J0 T1 _. r7 m4 PIntroduction: 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
i$ C t# Y) g9 |0 \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$ X* H9 c* |+ y$ F {
treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2* j5 ]4 A+ D7 O" }2 w
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
2 z% x; F2 d/ m$ y9 i/ band 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
: ~4 S7 E7 j6 G' A/ G8 i, hdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for8 U* l" }( j$ V- _8 N+ `
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to" i, \' i! q$ \1 w& P- S; B
lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and1 L5 V/ W0 d6 V* h7 n$ J! O
22.9 months for respectively early stage and stag e IV patients.
; ^$ Z. M% d# F3 \5 d# o. [( {Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,/ j t. N6 n& y- w
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
7 j! i: \/ s3 U# s% s4 lHER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
4 T* G& M7 h, }8 C, ~6 C- {% eclinicaltrials.: v, u# ?1 k) h
|