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The histological grading of neoplasms
1Division of Cancer Prevention and Control, National Cancer Institute, Bethesda, Md 20892.
Archives of Pathology & Laboratory Medicine
|November 1, 1988
Summary
Tumor grade significantly impacts cancer patient survival, offering prognostic value beyond disease stage. This study analyzed over 500,000 cases, confirming grade
Area of Science:
- Oncology
- Cancer Research
- Biostatistics
Background:
- Tumor grade is a key factor in cancer prognosis.
- Standardized grading guidelines across all cancer sites are lacking.
- The prognostic significance of tumor grade requires further validation.
Purpose of the Study:
- To investigate the relationship between tumor grade and cancer patient outcomes across 15 anatomic sites.
- To determine if tumor grade provides prognostic information independent of cancer stage.
- To evaluate the potential for a standardized grading system.
Main Methods:
- Analysis of over 500,000 cancer cases from the Surveillance, Epidemiology, and End Results (SEER) Program.
- Inclusion of nine-year follow-up data for a subset of cases.
- Statistical evaluation of survival rates stratified by tumor grade and cancer stage.
Main Results:
- Tumor grade significantly subdivided survival rates within each cancer stage.
- Survival differences between grade subsets were statistically significant.
- Tumor grade demonstrated prognostic value independent of cancer stage.
Conclusions:
- Cancer grading is a valuable prognostic tool, particularly when analyzed with survival data.
- Tumor grade provides crucial prognostic information in addition to cancer staging.
- Adoption of a three-grade system is proposed to reduce statistical variation and enhance consistency.