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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 J+Natl+Cancer+Inst
2018 ; 110
(7
): 787-790
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Immune-Active Microenvironment in Small Cell Carcinoma of the Ovary,
Hypercalcemic Type: Rationale for Immune Checkpoint Blockade
#MMPMID29365144
Jelinic P
; Ricca J
; Van Oudenhove E
; Olvera N
; Merghoub T
; Levine DA
; Zamarin D
J Natl Cancer Inst
2018[Jul]; 110
(7
): 787-790
PMID29365144
show ga
Small cell carcinoma of the ovary, hypercalcemic type (SCCOHT), is a highly
aggressive monogenic cancer driven by SMARCA4 mutations. Here, we report
responses to anti-PD1 immunotherapy in four patients and characterize the immune
landscape of SCCOHT tumors using quantitative immunofluorescence and gene
expression profiling. Unexpectedly for a low mutation burden cancer, the majority
of the tumors (eight of 11 cases) demonstrated PD-L1 expression with strong
associated T-cell infiltration (R2 = 0.60-0.95). PD-L1 expression was detected in
both tumor and stromal cells, with macrophages being the most abundant
PD-L1-positive cells in some tumors (three of 11 cases). Transcriptional
profiling revealed increased expression of genes related to Th1 and cytotoxic
cell function in PD-L1-high tumors, suggesting that PD-L1 acts as a pathway of
adaptive immune resistance in SCCOHT. These findings suggest that although SCCOHT
are low-mutational burden tumors, their immunogenic microenvironment resembles
the landscape of tumors that respond well to treatment with PD-1/PD-L1 blockade.