LUNG CANCER HARB ORING HER2 MUTATION :EPIDE MIOLOGI CAL CHARACTE RISTICS AND
5 _. _. x: O$ T& e' ATHERAPE UTIC PERSPECTIVES) |' }7 t# A2 J) q9 t& }, _/ @
J. Mazieres, S. Peters
( r2 {; D- G; ]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
* t% }. g/ p, e8 koutcomes 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
2 w. I' | |0 ]6 }treatment was delivered after convention al chemothe rapy. A total of 20 anti-Her2* y' Y3 l$ v" N0 a \+ }) l- }
treatments were eval uable. We observed 4 progressive dise ases, 7 disease stabilizations
5 e; P+ Q* ^3 O) Jand 9 partial resp onses according to RECIST 1.1 (overall response rate ORR = 45% ;
) X, @4 N. E" ]+ M: j; r: {! Sdisease control rate DCR = 80%). Specifica lly, we obse rved a DCR of 92% for* I! U; m, X. e1 P4 Y
trastuzum ab-based therapie s (n = 14), 100 % for afatinib (n = 3) but no response to
4 X/ a6 H' Q8 |6 j% H/ [lapatinib (n = 2) and to a multiTKI (n = 1). Median survival was of 68.2 months and
8 R% t1 U9 Z* s! p4 H; A o$ }22.9 months for respectively early stage and stag e IV patients.2 C4 u! i, P: R5 A N
Conclusion: This study, the largest to date dedic ated to HER2 mutated NSCLC,% S% a$ t& z( ]6 z0 x
reinforces the importance of an HER2 screening strategy in lung adenoc arcinomas .
' U: h: z7 ^" B8 D+ R2 V( ?HER2-target ed drugs shou ld be tested further, ide ally withi n large collaborative
' \* M1 `9 U4 U2 W/ Sclinicaltrials.
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