“We found that the E2F4 signature is predictive of the progression of both non-muscle-invasive and muscle-invasive bladder cancer,” said Cheng. “It can also predict the responsiveness of patients to intravesical Bacillus Calmette-Guerin (BCG) immunotherapy. Our results suggest that patients with positive E2F4 scores benefit significantly from BCG therapy, while the progression of patients with negative E2F4 scores does not show significant difference from untreated patients.”
Intravesical BCG therapy has been widely used to treat patients with non-muscle-invasive bladder cancer, with an up to 60% success rate in preventing recurrence or progression. However, there is no effective biomarker to identify which patients are responsive to this therapy.
The Cheng study found that the E2F4 biomarker could predict the responsiveness of patients with non-muscle-invasive bladder cancer to the BCG therapy. The study was based on an integrative analysis that included gene expression profiles for more than 800 bladder tumor samples with clinical information. The data was collected from the public database Gene Expression Omnibus (GEO).
“An integration of genomic data with clinical information will provide new biological insight in cancer biology and identify new biomarkers for aiding clinical practice,” explained Cheng. “Such translational studies need collective efforts from cancer biologists, clinicians, and computational biologists.”
Looking forward, Cheng and Marsit plan more detailed research to validate the prognostic value of the E2F4 signature in predicting bladder cancer progression or recurrence in an independent dataset. The goal is a convenient and practical clinical test based on E2F4 to predict the efficacy of the BCG program for bladder cancer patients.
Cheng is an Assistant Professor of Genetics at Dartmouth’s Geisel School of Medicine and teaches Bioinformatics at Dartmouth’s Institute for Quantitative Biomedical Science. His work in cancer is facilitated by Dartmouth’s Norris Cotton Cancer Center where he is a member of the Cancer Mechanisms Research Program.
Marsit is Associate Professor of Pharmacology & Toxicology, and Community & Family Medicine at Dartmouth’s Geisel School of Medicine. His work in cancer is facilitated by Dartmouth’s Norris Cotton Cancer Center where is Director of the Cancer Epidemiology Research Program.
This work was supported by the American Cancer Society Research Grant #IRG-82-003-30, and the National Center for Advancing Translational Sciences of the National Institutes of Health under award UL1TR001086.
About Norris Cotton Cancer Center at Dartmouth-Hitchcock Norris Cotton Cancer Center combines advanced cancer research at Dartmouth and the Geisel School of Medicine with patient-centered cancer care provided at Dartmouth-Hitchcock Medical Center in Lebanon, NH, at Dartmouth-Hitchcock regional locations in Manchester, Nashua, and Keene, NH, and St. Johnsbury, VT, and at 12 partner hospitals throughout New Hampshire and Vermont. It is one of 41 centers nationwide to earn the National Cancer Institute’s “Comprehensive Cancer Center” designation. Learn more about Norris Cotton Cancer Center research, programs, and clinical trials online at cancer.dartmouth.edu.
Grant No Link: IRG-82-003-30 Grant No Link: UL1TR001086 Journal Link: Molecular Cancer Research
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