Wenhan Zhu, Ph.D.

Colorectal cancer is the second most deadly cancer worldwide. Both bacteria in our gut and the activity of our own cells in the intestines can contribute to the risk of colorectal cancer. However, we don’t know how these two factors work together to cause cancer. Some “bad” bacteria use toxins to cause colorectal cancer. But cancer takes over 1,000 times longer than bacteria’s lifespan to develop. So why do bacteria purposefully cause cancer? We think that “bad” bacteria remodel intestinal cell activity to produce nutrients that the bacteria can use as “food.” The rewired intestinal cell metabolism helps cancer cells grow faster. In other words, cancer development is a side effect of the “bad” bacteria trying to get food. If we can better understand this process, we can develop treatments that stop the growth of the “bad” bacteria and the tumors they cause. Using experiments in mice, we will first test whether the “food” produced by the cells in our gut helps the “bad” bacteria grow better. We will then try to block this process to reduce the growth of both the “bad” bacteria and the tumors. Lastly, we will test whether what we find in animals holds true in humans. This proposal is innovative because it uses what “bad” bacteria “eat” to help us understand how they cause cancer. We hope to use what we learn to develop better, more effective treatments for patients suffering from colorectal cancer caused by “bad” bacteria.

Adam Durbin, MD, PhD

Funded by the Dick Vitale Pediatric Cancer Research Fund

Neuroblastoma is a common and deadly childhood tumor. Even with our best treatments, the disease may return. If this happens, our best treatments are not always effective and most patients will pass away. This motivated us to study how neuroblastoma becomes resistant to treatment. Neuroblastoma tumors are made up of different kinds of cancer cells, some of which are sensitive to chemotherapy, and some of which are resistant. Importantly, these different populations can switch between each other, causing sensitive cells to become resistant. How cells do this is not well understood, but may be related to proteins called “transcription factors.” Understanding how resistance occurs may allow us to create new treatments. These treatments could change resistant cells into sensitive cells or stop sensitive cells from becoming resistant. In this proposal, we will use new tools to understand how neuroblastoma cells switch between sensitivity and resistance. We will also use these tools to identify the controllers of these switches. We hope these studies will lead to new ways to treat children with neuroblastoma by targeting resistant cells. We believe this will create new ways to stop this terrible childhood cancer.

Jason Schwartz, MD, PhD

Funded by the Dick Vitale Pediatric Cancer Research Fund

The Schwartz Lab studies two genes, SAMD9 and SAMD9L that are known to cause a bone marrow failure syndrome in children called myelodysplastic syndrome (MDS). There are no reliable pediatric MDS model systems, thus we have created one from a special type of stem cell that contains mutated SAMD9 or SAMD9L. It is important to have these new cell lines, because cells that we can obtain from patients do not grow well or for a long time making studying them very hard. We will perform several tests in our new model system to determine why mutations in SAMD9 and SAMD9L cause blood stem cells to die. Together with our cell lines we have also developed a second set of tools that will allow us to turn on or to turn off SAMD9 or SAMD9L without using interferon—an inflammatory substance in the cell that turns on many other cell processes including SAMD9 and SAMD9L. We have completed initial experiments that suggest that SAMD9 and SAMD9L are important in how cells communicate during inflammation and other immune responses. Our proposed experiments will further determine how disease-causing mutations in SAMD9 and SAMD9L disrupt communication in these important cellular pathways. Understanding how SAMD9/9L mutations effect the blood stem cells will help us determine the right treatment approach for patients with pediatric MDS, because some patients with SAMD9 or SAMD9L mutations may not need treatment at all.

Chunliang Li, PhD

Funded by the Dick Vitale Pediatric Cancer Research Fund in memory of Austin Schroeder

Over the past decades, the cure rate of pediatric leukemia has significantly increased because of improved understanding of diagnosis, chemotherapy combinations, and supportive patient care. However, patients with MLL-rearranged subtype leukemia still face an unfavorable outcome and few therapeutic options. To date, the five-year survival of patients in this subtype is less than 70%, much lower than most other patients. To better improve the treatment outcome and increase the survival, many novel therapeutic drugs have been identified. Among these drugs, the inhibitors against BET proteins hold a great promise. So far, the mechanisms controlling drug response and resistance are not well understood. To our knowledge, our proposed research fits the goal of the V-foundation. We have conducted a successful genome-wide screen. We are going to study the function of novel candidate genes in drug resistance models in vitro and in vivo, as well as the working mechanism. Completing our proposed work is expected to significantly prevent and treat drug resistance and relapsesaving more patients with this deadly disease. 

Scott Hiebert, PhD

Funded by Matthew Ishbia and the Dick Vitale Pediatric Cancer Research Fund

Childhood cancers of developing muscle are some of the most difficult to treat childhood cancers. Therapy has not significantly changed in the past 20 years and there isn’t even a meaningful new treatment being considered. Currently, even after the most intensive therapy possible, a third of these tumors will return and take the life of a child or young adult. We have taken a new approach using state-of-the-art methods to identify what we hope will be more targeted and less toxic treatments that yield better outcomes. We have already identified three new therapeutic avenues that we will test. The first is to ask if the abnormal gene that drives this disease, called PAX3-FOXO1, is a good drug target. We engineered the gene to be sensitive to a derivative of a known drug. While we can’t do this in kids, it allows us to ask what would happen if we had a drug? Second, we found that PAX3-FOXO1 turns on a small number of other genes, and we already have drugs that can target some of these. Third, we identified other possible drug targets that PAX3-FOXO1 recruits. We will test if these are key to causing cancer and if they would be good drug targets. We believe that our comprehensive approach gives us the best chance in the past 30 years to change the lives of these children with cancer, and to identify drugs or drug combinations that will be less toxic and yield better outcomes for these patients. 

Stephen Mack, PhD

Funded by Mark and Cindy Pentecost in memory of Chika Jeune

Pediatric brain tumors are the most common cause of cancer related death in children. Diffuse midline glioma (DMG), a type of childhood brain tumor, is universally fatal. Our lab has demonstrated in mouse models that DMG is responsive to two classes of treatments known as epigenetic and metabolic therapies. A major challenge in patients, however, is that single drugs are unlikely to be effective against this highly aggressive malignancy. Our grant proposal seeks to test the efficacy and biology of a combinatorial treatment of three drugs against DMG in an effort to generate pre-clinical data which could be potentially advanced to clinical trials in patients. In addition, our grant seeks to understand how these therapies influences the population of cells within a given tumor that may confer therapeutic resistance. We envision that these therapeutic and molecular insights will advance our understanding of DMG and lead to novel treatment paradigms.

Zhaoming Wang, PhD

Supported by Bristol-Myers Squibb through the Robin Roberts Cancer Thrivership Fund

Survivors of childhood cancer are at high risk of late health problems related to cancer treatment. Our early work suggested that health problems differ among survivors based on social-economic status like level of education, household/personal income, and the neighborhood in which they live. In the proposed research, we will describe and measure differences in health problems among childhood cancer survivors based on the social-economic status. We will focus on common health problems including obesity, high blood fat levels (triglycerides or cholesterol), abnormal blood sugar control, high blood pressure, heart muscle weakness, and heart attack. We will use stored blood samples and data already available from the St. Jude Lifetime Cohort Study to study biologic changes that may predict a survivor’s risk of health problems and links to social-economic factors. We hope that the results of this work will help identify survivors at higher risk for health problems and guide new research aiming to reduce, reverse, or prevent the harmful effects of social-economic factors on health problems after treatment for childhood cancer. 

Mariana Byndloss, DVM, PhD

Funded through the Stuart Scott Memorial Cancer Research Fund by John and Michele Truchard in honor of Jo Ann Truchard

Colorectal cancer is the second most common cause of cancer-related death in the United States. New research shows that colorectal cancer cases are increasing in younger age groups. We know that obesity is a major risk factor for colorectal cancer rates among younger adults, but we still don’t understand exactly how it works. Our research goal is to answer this important question. Obesity is mostly caused by unhealthy eating habits, including eating a diet rich in “bad fats”. First, we want to understand how healthy cells are damaged by “bad fats”. This is important because damages cells can produce harmful substances that cause cancer. “Bad fats” may also produce substances that feed harmful bacteria living in our intestines. These bacteria produce toxins that cause cancer. We will try to understand how the bad bacteria use this “food” to grow in the gut of obese individuals. This will help us show that “bad fats” cause cancer both by damaging cells and by feeding cancer-causing bacteria. If successful, our work will show how the dietary habits that lead to obesity can also cause colorectal cancer by damaging cells and feeding the growth of harmful bacteria. These findings will help us find new treatments for patients suffering from cancers caused by obesity.

Vivian Weiss, M.D., Ph.D.

Funded by the Tyler Trent Fund and the Dick Vitale Pediatric Cancer Research Fund

A critical failure in the field of pediatric thyroid cancer care is the use of adult treatments for a childhood disease that has distinct genetics and tumor behavior. With thyroid cancer incidence rapidly increasing, we need to develop personalized treatments for this population to ensure their long and productive lives. There is currently no way to predict which children will go on to develop recurrent or aggressive disease at the time of biopsy and thyroid surgery. While thyroid cancer is generally curable, adolescents and young adults present with more frequent local and metastatic disease when compared to older adults. Adult treatment protocols lead to high cure rates, but adolescents and young adults have many years of potential recurrence, radioactivity-induced side effects, and secondary malignancies ahead. Precision medicine is becoming the standard of care for many diseases except pediatric thyroid cancer.

To develop more individualized pediatric thyroid cancer care, the scientific community must first strive to better understand the mutations and abnormal cellular signaling responsible for thyroid cancer behavior. Our research program utilizes a large cohort of adolescent and young adult human thyroid tumors in order to study the signaling pathways responsible for the unique growth and spread of each tumor. The funds from the Pediatric Cancer V Scholar Award will lead to an improved understanding of thyroid cancer development in this population and innovative therapies for children with this disease. These treatment strategies can then be applied to a wide range of pediatric cancers with reliance on similar signaling pathways.

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