Incorporating age into International Germ Cell Consensus Classification (IGCCC): a time to move forward?

Area of Science:

• Oncology
• Clinical Epidemiology

Background:

• Older age is a known poor prognostic factor in germ cell tumor (GCT) patients.
• The International Germ Cell Consensus Classification (IGCCC) is a standard prognostic tool for advanced GCTs.
• The need for improved risk stratification considering age in GCT management is evident.

Purpose of the Study:

• To evaluate an age-integrated IGCCC for advanced germ cell tumors.
• To assess the prognostic relevance of age-adjusted risk groups in GCT patients.

Main Methods:

• Utilized the SEER database (2004-2014) for patient data.
• Calculated both traditional IGCCC and an age-integrated IGCCC based on primary site, metastasis site, and tumor markers.
• Performed overall survival analyses using Kaplan-Meier and Cox-regression models.

Main Results:

• The age-integrated IGCCC demonstrated superior discrimination compared to the traditional IGCCC for both seminoma (c-index 0.664 vs. 0.553) and non-seminomatous germ cell tumors (NSGCTs) (c-index 0.738 vs. 0.729).
• All pairwise comparisons among age-integrated IGCCC categories were statistically significant (P<0.01) for both seminoma and NSGCTs.
• Age-integrated IGCCC identified prognostically relevant risk groups with significant differences in cancer-specific survival.

Conclusions:

• The age-integrated IGCCC is a more discriminatory prognostic tool than the traditional IGCCC for advanced germ cell tumors.
• The newly defined risk groups within the age-integrated IGCCC are clinically relevant for patient stratification.
• Incorporating age into the IGCCC enhances its predictive power for germ cell tumor outcomes.