A proposal for an international retinoblastoma staging system

Area of Science:

• Ophthalmology
• Pediatric Oncology
• Cancer Staging

Background:

• Retinoblastoma staging lacked a universally accepted system for extraocular disease.
• Existing Reese-Ellsworth (R-E) system is limited to intra-retinal tumors.
• Need for a comprehensive classification for disease extension, relapse risk, and therapy response.

Purpose of the Study:

• To develop a consensus classification system for retinoblastoma encompassing all disease stages.
• To establish a uniform system for comparing retinoblastoma studies globally.
• To propose substaging for enucleated eyes based on histopathology.

Main Methods:

• A global committee of retinoblastoma experts convened to develop a consensus classification.
• Classification based on disease extent and presence of extraocular extension.
• Proposal for substaging Stage I and II enucleated eyes using histopathological features.

Main Results:

• A new staging system (Stages 0-IV) was developed, detailing intraocular and extraocular disease.
• Stage 0: Conservative treatment; Stage I: Complete resection; Stage II: Residual microscopic tumor.
• Stage III: Regional extension (orbital/lymph node); Stage IV: Metastatic disease (hematogenous/CNS).

Conclusions:

• The proposed staging system offers a uniform approach for retinoblastoma classification.
• This international effort aims to standardize the assessment of retinoblastoma across its entire spectrum.
• The system facilitates better comparisons of treatment outcomes and research findings.