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2016 ; 143
(2
): 393-397
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The CD47 "don t eat me signal" is highly expressed in human ovarian cancer
#MMPMID27569584
Brightwell RM
; Grzankowski KS
; Lele S
; Eng K
; Arshad M
; Chen H
; Odunsi K
Gynecol Oncol
2016[Nov]; 143
(2
): 393-397
PMID27569584
show ga
OBJECTIVES: The CD47 "don't eat me" signal allows tumor immune evasion. We tested
the association of CD47 expression with outcomes in EOC. METHODS: CD47 expression
was examined within the TCGA database for ovarian carcinoma. For validation, IHC
was performed on a TMA consisting of specimens from 265 patients with EOC. The
medical records of the patients were also retrospectively reviewed to correlate
demographic and survival data. RESULTS: CD47 was amplified in 15/316 (5%) ovarian
serous cancers in TCGA. In the validation cohort, the majority of patients had
stage III/IV disease (208/265, 78.4%). CD47 expression was seen in 210/265
(79.2%). Patients were categorized into CD47hi (129/265; 48.7%) versus CD47lo
(136/265; 51.3%). Patients with CD47lo tumors were more likely to have a complete
response to adjuvant therapy than CD47hi (65% vs 50%, p=0.026). Although there
was a trend towards an increase in median OS (37.64 vs 45.26months, p=0.92) in
the CD47lo group compared with CD47hi, the difference was not significant.
CONCLUSIONS: CD47 is expressed at high frequency in EOC. Patients with CD47lo EOC
had a better treatment response to standard therapy, and trended towards improved
OS. This demonstrates that while CD47 may be an immunologic shield that may be
considered for targeted therapies, it is likely that it operates in concert with
other mechanisms of immune evasion. Future studies to evaluate CD47 expression
with other known mechanisms of immune escape in the tumor microenvironment may
help further define its role.
|CD47 Antigen/*analysis/genetics
[MESH]
|Carcinoma, Ovarian Epithelial
[MESH]
|Female
[MESH]
|Humans
[MESH]
|Middle Aged
[MESH]
|Neoplasms, Glandular and Epithelial/*chemistry
[MESH]