Abstract
The extracellular matrix protein fibronectin (FN) contributes to the structural integrity of tissues as well as the adhesive and migratory functions of cells. While FN is abundantly expressed in adult tissues, the expression of several alternatively spliced FN isoforms is restricted to embryonic development, tissue remodeling and cancer. These FN isoforms, designated ED-A and ED-B, are frequently expressed by cancer cells, tumor-associated fibroblasts and newly forming blood vessels. Using a highly sensitive collagen-based indirect ELISA, we evaluated the correlation of urinary ED-A and ED-B at time of cystectomy with overall survival in patients with high-grade bladder cancer (BCa). Detectable levels of total FN as well as ED-A and ED-B were found in urine from 85, 73 and 51 % of BCa patients, respectively. The presence of urinary ED-A was a significant independent predictor of 2-year overall survival (OS) after adjusting for age, tumor stage, lymph node stage, and urinary creatinine by multivariable Logistic Regression (p = 0.029, OR = 4.26, 95 % CI 1.16–15.71) and improved accuracy by 3.6 %. Furthermore, detection of ED-A in the urine was a significant discriminator of survival specifically in BCa patients with negative lymph node status (Log-Rank, p = 0.006; HR = 5.78, 95 % CI 1.39–24.13). Lastly, multivariable Cox proportional hazards analysis revealed that urinary ED-A was an independent prognostic indicator of 5-year OS rate for patients with BCa (p = 0.04, HR = 2.20, 95 % CI 1.04–4.69). Together, these data suggest that cancer-derived, alternatively spliced FN isoforms can act as prognostic indicators and that additional studies are warranted to assess the clinical utility of ED-A in BCa.
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Acknowledgments
We gratefully acknowledge the laboratory of Bob Matusik including the technician responsible for long-term sample collection, Manik Paul. Many thanks to Paul Knoll and Chaochen You for development and maintenance of the urology database. We would also like to thank Alison Woodworth and Sherrie Stafford in the Vanderbilt Clinical Chemistry laboratory for collection of normal controls.
Author contributions
SA, HL, CA and AZ were responsible for the study concept and design as well as manuscript preparation. SA performed specimen processing and analysis, database construction and maintenance, and all data/statistical analyses. HL performed all ELISA assays and contributed to the data analysis. PC contributed to the VUMC cohort selection and collection, as well as manuscript editing. TK optimized and performed IF.
Funding
This work was supported by the National Institutes of Health for SA (VCORCDP K12-CA9060625 and CTSA UL1-TR000445), HL (T32-CA009593), CA (DK094900 and DK091491), and AZ (R01-CA143081 and P01-CA040035). SA was also supported by the Department of Veterans Affairs (IK2BX002498).
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Impact statement
Despite improvements in the detection and treatment of bladder cancer (BCa), few advances have been made in predicting outcome and non-invasively monitoring disease progression. We show that the ED-A isoform of fibronectin and not total fibronectin is a prognostic urinary biomarker in BCa. Furthermore, the greatest discrimination with urinary ED-A occurs in lymph node negative patients where those with undetectable levels of urinary ED-A are 10 times more likely to survive 2 years following cystectomy compared to those with any detectable level of urinary ED-A.
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Shanna A. Arnold and Holli A. Loomans have contributed equally to this work.
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Arnold, S.A., Loomans, H.A., Ketova, T. et al. Urinary oncofetal ED-A fibronectin correlates with poor prognosis in patients with bladder cancer. Clin Exp Metastasis 33, 29–44 (2016). https://doi.org/10.1007/s10585-015-9754-x
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DOI: https://doi.org/10.1007/s10585-015-9754-x