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Prediagnostic hematocrit values and subsequent cancer risk
I Kato1, A Nomura, G N Stemmermann
1Japan-Hawaii Cancer Study, Kuakini Medical Center, Honolulu 96817.
Summary
Higher hematocrit levels correlated with increased kidney cancer risk in Japanese-American men. Conversely, elevated hematocrit was linked to a decreased risk of oral-pharyngeal cancer, suggesting complex associations.
Area of Science:
- Oncology
- Epidemiology
- Hematology
Background:
- Hematocrit, a measure of red blood cell volume, is a common clinical parameter.
- Previous research has explored links between hematocrit and various health outcomes, but cancer-specific associations require further investigation.
Purpose of the Study:
- To investigate the prospective association between baseline hematocrit levels and the incidence of specific cancers.
- To explore potential differential risks for lung, kidney, and oral-pharyngeal cancers based on hematocrit values.
Main Methods:
- Prospective cohort study involving 7737 Japanese-American men in Hawaii, with data collected between 1965-1968.
- Statistical analysis to assess the relationship between baseline hematocrit levels and subsequent cancer incidence, adjusting for smoking and alcohol intake.
Main Results:
- An increasing risk for lung cancer (especially squamous or small cell types) and kidney cancer was observed with higher hematocrit levels.
- A statistically significant trend persisted only for kidney cancer after adjusting for smoking history (Relative Risk = 4.94 for hematocrit ≥47 vs. ≤43).
- A decreased risk of oral-pharyngeal cancer was associated with higher hematocrit levels, even after adjusting for smoking and alcohol intake (Relative Risk = 0.20 for hematocrit ≥47 vs. ≤43).
Conclusions:
- Hematocrit levels show a differential association with cancer incidence, increasing risk for kidney cancer and decreasing risk for oral-pharyngeal cancer.
- The observed associations were independent of the time interval between examination and cancer diagnosis.
- Potential biological mechanisms, including erythropoietin production by kidney tumors and micronutrient deficiencies in oral-pharyngeal cancer, may explain these findings.