Abstract
Purpose
In biliary tract cancer (BTC), malignancy is strongest at the invasion front. To improve the BTC prognosis, the invasion front should be controlled. We evaluated tumor–stroma crosstalk at the tumor center and at the invasion front of BTC lesions. We investigated the expression of SPARC, a marker of cancer-associated fibroblasts, and determined its ability to predict BTC prognosis after neoadjuvant chemoradiotherapy (NAC-RT).
Methods
We performed immunohistochemistry to evaluate SPARC expression in resected specimens from patients that underwent BTC surgery. We established highly invasive (HI) clones in two BTC cell lines (NOZ, CCLP1), and performed mRNA microarrays to compare gene expression in parental and HI cells.
Results
Among 92 specimens, stromal SPARC expression was higher at the invasion front than at the lesion center (p = 0.014). Among 50 specimens from patients treated with surgery alone, high stromal SPARC expression at the invasion front was associated with a poor prognosis (recurrence-free survival: p = 0.033; overall survival: p = 0.017). Coculturing fibroblasts with NOZ-HI cells upregulated fibroblast SPARC expression. mRNA microarrays showed that connective tissue growth factor (CTGF) was upregulated in NOZ-HI and CCLP1-HI cells. A CTGF knockdown suppressed cell invasion in NOZ-HI cells. Exogeneous CTGF upregulated SPARC expression in fibroblasts. SPARC expression at the invasion front was significantly lower after NAC-RT, compared to surgery alone (p = 0.003).
Conclusion
CTGF was associated with tumor–stroma crosstalk in BTC. CTGF activated stromal SPARC expression, which promoted tumor progression, particularly at the invasion front. SPARC expression at the invasion front after NAC-RT may serve as a prognosis predictor.
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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HT, SK, KG, YI and HE were involved in study design and data interpretation. HT, SK, KG, KS, YI, DY, YT, TN, HT, HA, HW, TA, MT, YD and HE were involved in the data analysis. All authors critically revised the report, commented on drafts of the manuscript, and approved the final report.
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The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Human Ethics Review Committee of the Graduate School of Medicine, Osaka University (No. 20493).
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432_2023_4835_MOESM1_ESM.tif
Supplementary fig. 1 SPARC is primarily expressed in fibroblast cells and rarely in biliary tract cancer (BTC) cells. (a) qRT-PCR results show SPARC mRNA expression and (b) Western blot shows SPARC protein expression in normal human dermal fibroblasts (NHDFs), BTC cells (NOZ-parental), and highly invasive BTC cells (NOZ-HI) (TIF 677 KB)
432_2023_4835_MOESM2_ESM.tif
Supplementary fig. 2 Evaluation of CTGF and SPARC immunostaining in BTC resected specimens. Immunohistochemistry of CTGF and SPARC in BTC resected specimens. (a) Representative figure of positive staining for CTGF (b) Representative figure of positive staining for SPARC (c) Representative figure of negative staining for CTGF (d) Representative figure of negative staining for SPARC. (a) and (b), (c) and (d) are the same field of the same specimen (TIF 8460 KB)
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Takayama, H., Kobayashi, S., Gotoh, K. et al. SPARC accelerates biliary tract cancer progression through CTGF-mediated tumor–stroma interactions: SPARC as a prognostic marker of survival after neoadjuvant therapy. J Cancer Res Clin Oncol 149, 10935–10950 (2023). https://doi.org/10.1007/s00432-023-04835-7
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DOI: https://doi.org/10.1007/s00432-023-04835-7