Introduction
Primary squamous cell carcinoma (SCC) of the kidney is an exceptionally rare malignancy, current knowledge being limited to isolated case reports and small case series. This study represents the first population-based analysis of SCC of the kidney using data from the Surveillance, Epidemiology, and End Results (SEER) database.
Patients and Methods
This retrospective cohort study was conducted using the SEER Research Data (2000-2022). Patients aged ≥ 15 years with histologically confirmed primary renal SCC and tumor site C64.9 (kidney) were included. Patients were categorized into metastatic and non-metastatic subgroups. Survival outcomes in the overall cohort were estimated using the Aalen–Johansen method to generate cumulative incidence functions, while Gray’s test was applied for subgroup comparisons. Prognostic factors associated with cancer-specific mortality (CSM) in the overall cohort and the metastatic subgroup were evaluated using the Fine–Gray proportional subdistribution hazards model.
Results
The 2-year CSM rate among the 114 patients was 83.7%. The majority of patients (78.9%) were aged ≥ 60 years. In the overall cohort, right-sided tumor location (P = .026) and bone metastasis at diagnosis (P < .001) were significantly associated with an increased risk of CSM, while unmarried status (P = .090), lack of surgical treatment (P = .054), and receipt of radiotherapy (P = .050) exhibited borderline associations with an increased risk. At multivariate analysis, right-sided tumor location and radiotherapy were independently associated with poorer survival, while surgical treatment emerged as an independent predictor of improved survival in the metastatic group.
Conclusions
Primary SCC of the kidney is a rare and aggressive malignancy, typically diagnosed at advanced stages and associated with poor outcomes. Unmarried status, right-sided tumor location, bone metastasis at diagnosis, lack of surgical treatment, and receipt of radiotherapy were associated with an increased risk of CSM. Further multicenter studies with detailed clinical data are now needed to guide evidence-based management of this uncommon disease.
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