Which are the causes of Wilms Tumor?

Wilms tumor, also known as nephroblastoma, is primarily caused by abnormal development of embryonic kidney cells that fail to mature into healthy tissue. While the exact trigger for most cases is unknown, researchers have identified specific genetic mutations and developmental syndromes that significantly increase the risk of developing Wilms tumor.

What causes Wilms tumor to develop?

The development of Wilms tumor occurs when cells that are meant to form the kidneys during fetal development do not differentiate properly. Instead of maturing, these cells remain in an immature, "embryonic" state and continue to grow uncontrollably, forming a tumor. In the vast majority of cases, Wilms tumor is sporadic, meaning it occurs randomly without a clear, identifiable external cause or inherited pattern.

Are there specific genetic factors involved?

Genetic research has identified several key genes involved in the pathogenesis of Wilms tumor, most notably the WT1 gene located on chromosome 11. Other genetic alterations, such as those in the CTNNB1 or WTX genes, are also frequently studied. While most children with Wilms tumor do not have a family history, approximately 1-2% of cases are associated with specific hereditary syndromes, such as WAGR syndrome (Wilms tumor, Aniridia, Genitourinary anomalies, and Range of developmental delays).

What are the known risk factors for Wilms tumor?

It is important to distinguish between "causes" (the direct biological mechanism) and "risk factors" (associations that increase likelihood). Current clinical data suggests the following factors are linked to higher risks:

• Genetic Syndromes: Conditions like Denys-Drash syndrome or Beckwith-Wiedemann syndrome.


• Birth Defects: Congenital anomalies involving the urinary tract or reproductive organs.


• Family History: While rare, having a first-degree relative with the condition can slightly increase risk.


• Age: The condition is most commonly diagnosed in children between the ages of 3 and 4 years.

What does current research focus on?

Researchers are currently investigating the epigenetic changes—how genes are turned on or off without changing the DNA sequence—that may contribute to Wilms tumor. Ongoing studies aim to better categorize tumor subtypes to refine treatment protocols and minimize long-term side effects for survivors. Our community at DiseaseMaps.org, which includes 18 members sharing their experiences with Wilms tumor, continues to support the importance of these clinical insights.

Next steps

• Consult a pediatric oncologist or a pediatric urologist for specialized care.


• Request a referral to a clinical geneticist if your family has a history of childhood cancers or developmental syndromes.


• Connect with the 18 members on DiseaseMaps.org to share experiences and find supportive resources.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Wilms tumor.


• Orphanet: Nephroblastoma.


• National Cancer Institute (NCI): Wilms Tumor and Other Childhood Kidney Tumors.


• OMIM (Online Mendelian Inheritance in Man): Wilms Tumor 1; WT1.