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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Oncoimmunology
2016 ; 5
(7
): e1052212
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Combined treatment with dabrafenib and trametinib with immune-stimulating
antibodies for BRAF mutant melanoma
#MMPMID27622011
Homet Moreno B
; Mok S
; Comin-Anduix B
; Hu-Lieskovan S
; Ribas A
Oncoimmunology
2016[Jul]; 5
(7
): e1052212
PMID27622011
show ga
The combination of targeted therapy with BRAF and MEK inhibitors has become the
standard of care in patients with BRAF (V600E) mutant melanoma, but responses are
not durable. In addition, the impressive clinical benefits with anti-PD-1 and
anti-PD-L1 antibodies (Ab) in patients with heavily pretreated metastatic
melanoma and the synergistic effect of dabrafenib, trametinib and anti-PD-1
compared with single therapy alone groups support the idea that combining
dabrafenib, trametinib and immunotherapy based on PD-1 blockade could be an
interesting approach in the treatment of metastatic melanoma. With our mouse
model of syngeneic BRAF (V600E) driven melanoma (SM1), we tested whether the
addition of an immunostimulatory Ab targeting CD137 (4-1BB) and/or CD134 (OX40)
would enhance the antitumor effect of dabrafenib, trametinib and anti-PD-1 or
anti-PD-L1 therapy. In vitro studies showed that the combination group of
dabrafenib, trametinib and anti-PD-1 increases CD8(+) tumor infiltrating
lymphocytes (TILs), as well as CD4(+) T cells and tumor-associated macrophages
(TAMs). An upregulation of PD-L1 was observed in the combination of dabrafenib,
trametinib and anti-PD-1 therapy. Combination of dabrafenib, trametinib and
anti-PD-1, with either anti-CD137 or anti-CD134, showed a superior antitumor
effect, but the five-agent combination was not superior to the four-agent
combinations. In conclusion, the combination of dabrafenib, trametinib, anti-PD1
or anti-PD-L1 therapy results in robust antitumor activity, which is further
improved by adding the immune-stimulating Ab anti-CD137 or anti-CD134. Our
findings support the testing of these combinations in patients with BRAF (V600E)
mutant metastatic melanoma.