Rete Testis Invasion Is Consistent With Pathologic Stage T1 in Germ Cell Tumors

Area of Science:

• Urology
• Oncology
• Pathology

Background:

• Rete testis invasion (RTI) often occurs with lymphovascular or spermatic cord invasion (LVI/SCI) in germ cell tumors.
• The independent prognostic significance of RTI for staging remains unclear.

Purpose of the Study:

• To investigate the independent implications of rete testis invasion (ReteD and ReteP) on staging in germ cell tumors.
• To determine if RTI affects metastatic status or relapse rates.

Main Methods:

• Analysis of 171 seminomas and 178 nonseminomatous germ cell tumors (NSGCTs) from five institutions.
• Assessment of direct rete testis invasion (ReteD) and rete pagetoid spread (ReteP).
• Correlation of RTI with tumor size, metastatic status, and relapse data.

Main Results:

• Rete testis invasion (ReteP and ReteD) was more common in seminoma than NSGCT.
• In seminoma, tumor size (≥3 cm) predicted metastatic status, but ReteP/ReteD did not correlate with size, metastasis, or relapse.
• In NSGCT, ReteP/ReteD showed no correlation with size, metastatic status, or relapse.

Conclusions:

• The findings support the retention of the American Joint Committee for Cancer pathologic T1 stage for rete testis invasion.
• The study advocates for the continued use of pT1a/pT1b substaging for seminoma, irrespective of rete testis invasion.