DNA Today: A Genetics Podcast #294 Newborn Screening for Cancer Disposition with Dr. Lisa Diller
In this episode we explore the emerging field of newborn screening for cancer predisposition with Dr. Lisa Diller from Dana-Farber/Boston Children’s.
What’s special about this podcast episode? Two Sarah Lawrence Genetic Counseling students took over! Great job to Jessica Fernandes and Yalda Safaei on this interview.
Dr. Lisa Diller is the Vice Chair of the Department of Pediatric Oncology and the Director of the Perini Family Survivors Center and the David B. Perini Jr. Quality of Life Clinic at the Dana-Farber Cancer Institute. Additionally, she is a co-director of the Pediatric Cancer Genetic Risk Program at the Dana-Farber/Boston Children’s Cancer and Blood Disorders Center. Dr. Diller's research focuses on the late effects of treatment for childhood cancer and genetic cancer predisposition syndromes in childhood.
Newborn screening (NBS) is a vital public health service that detects genetic, metabolic, and congenital disorders early, allowing for timely intervention and better health outcomes. While traditional screening focuses on metabolic and genetic disorders, screening for cancer predisposition is still in its early stages, with ongoing research and pilot programs evaluating its feasibility and benefits. NBS is currently done using a biochemical blood test, but Dr. Diller explains the advantages of using a gene-first approach, which has been documented in a study published in the Journal of the American Medical Association which recruited roughly 30,000 Chinese newborns. The study’s findings state that using genetic testing as a first-tier approach improved detection capability as opposed to traditional methods (Chen et al. 2023).
Gene-first sequencing, also known as "phenotype-first" or "candidate-gene" sequencing, is an approach in genetic testing where specific genes that are suspected to be associated with a particular phenotype (observable traits or symptoms) are sequenced first. This method contrasts with more comprehensive sequencing techniques such as whole-exome sequencing (WES) or whole-genome sequencing (WGS), where all protein-coding regions or the entire genome, respectively, are sequenced.
Nevertheless, implementing widespread newborn screening for cancer predisposition faces several challenges. Technological limitations need addressing to ensure accurate and reliable results, healthcare infrastructure must adapt, and the costs associated with additional genetic tests and follow-up care can be high. Additionally, the psychological impact on families knowing their child has a predisposition to cancer and what it might mean for them must be considered. Ethical considerations are also crucial in this context. Informed consent, privacy, classification of variants, and the potential for discrimination based on genetic information are key concerns. Dr Diller highlights potential stigma that comes with the “label” of being positive and also how many conditions lack complete penetrance; meaning it is difficult to say when or even if these children will develop cancer.
The importance of early detection is underscored by hereditary conditions like retinoblastoma and Li-Fraumeni syndrome (LFS). Retinoblastoma, a rare eye cancer, can be life-threatening if not detected early, but early screening and intervention can significantly improve outcomes. While screening for adult onset cancers like BRCA1/2 in newborns is not recommended, LFS is also associated with various childhood cancers, thus detecting such predispositions early allows for surveillance and preventive measures, potentially saving lives. Following a positive result, parents have the ability to make informed decisions for their children’s health management, whether that requires immediate intervention/therapies, or close monitoring.
Dr. Diller emphasizes the importance of the gene-first approach and its role in the trajectory of newborn screening. She highlights the potential of early detection and intervention to significantly reduce cancer morbidity and mortality, and she is encouraged by continued research and support for these promising initiatives.
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