Anaplastic Wilms' tumor: clinical and pathologic studies.

Area of Science:

• Pediatric Oncology
• Nephrology
• Clinical Trials

Background:

• Wilms tumor is a common pediatric kidney cancer.
• Anaplastic Wilms tumor is a subtype with distinct clinical features and prognosis.
• Understanding differences between anaplastic and non-anaplastic Wilms tumor is crucial for treatment optimization.

Purpose of the Study:

• To compare clinical presentation and treatment response in anaplastic versus non-anaplastic Wilms tumor.
• To evaluate the impact of aggressive chemotherapy on survival for anaplastic Wilms tumor.
• To explore the role of clinicopathologic stage in determining survival for anaplastic Wilms tumor.

Main Methods:

• Review of data from 1,191 children in the National Wilms Tumor Study (NWTS-1 and NWTS-2).
• Analysis of differences in age, race, metastasis at diagnosis, and survival between anaplastic and non-anaplastic Wilms tumor.
• Assessment of chemotherapy efficacy and stage-specific survival in NWTS-2 patients.

Main Results:

• Children with anaplastic Wilms tumor were older, more frequently non-white, and had higher rates of lymph node metastasis at diagnosis.
• Anaplastic Wilms tumor was associated with significantly shorter survival compared to non-anaplastic types.
• Aggressive chemotherapy in NWTS-2 improved survival for diffuse anaplastic tumors, with stage also influencing outcomes.

Conclusions:

• Anaplastic Wilms tumor presents unique challenges, including older age at diagnosis and increased metastasis.
• Advanced chemotherapies show promise in improving survival for patients with anaplastic Wilms tumor.
• Tailoring treatment based on clinicopathologic stage may enhance cure rates and reduce treatment toxicity in localized anaplastic Wilms tumor.