Clear Cell Renal Cell Carcinomas with Aggressive Behavior Display Low Intratumor Heterogeneity at the Histological...

Area of Science:

• Oncology
• Pathology
• Genomics

Background:

• Intratumor heterogeneity (ITH) is a hallmark of most cancers, complicating diagnosis and treatment.
• The clinical significance of varying degrees of ITH, particularly in clear cell renal cell carcinoma (CCRCC), remains incompletely understood.

Purpose of the Study:

• To investigate the relationship between the level of histological intratumor heterogeneity (ITH) and the clinical behavior and survival of patients with clear cell renal cell carcinoma (CCRCC).
• To determine if quantifying ITH can serve as a predictive marker for tumor evolution.

Main Methods:

• Analysis of 28 clear cell renal cell carcinoma (CCRCC) samples using two distinct sampling protocols: multisite tumor sampling (MSTS) and total sampling.
• Evaluation of the correlation between low versus high levels of detected histological ITH and tumor aggressiveness and patient survival.

Main Results:

• All analyzed CCRCC cases (n=14) exhibiting an aggressive clinical course demonstrated low levels of ITH.
• A statistically significant association was found between low ITH levels and worse patient survival (p < 0.001).
• The study suggests that extensive sampling for ITH quantification can help predict tumor evolution.

Conclusions:

• Low histological intratumor heterogeneity is a significant indicator of aggressive behavior and poorer prognosis in clear cell renal cell carcinoma.
• Quantifying ITH through comprehensive sampling strategies may offer valuable prognostic information for CCRCC patients.