Ha-ras Gene Variations and Colorectal Cancer
Author Information
Author(s): F.S. Wyllie, V. Wynford-Thomas, N.R. Lemoine, G.T. Williams, E.D. Williams, D. Wynford-Thomas
Primary Institution: University of Wales College of Medicine
Hypothesis
Is there an association between Ha-ras gene variations and susceptibility to colorectal cancer?
Conclusion
The study found that while the overall prevalence of rare alleles was not significantly different between cancer patients and controls, the common alleles a3 and a4 were more frequent in cancer patients.
Supporting Evidence
- The combined frequency of the two larger alleles a3 and a4 was approximately twice as high in the cancer group compared to controls.
- The overall frequency of rare alleles was 2.0% in controls and 7.6% in cancer patients, but this difference was not statistically significant.
- Sub-division of the cancer group by differentiation grade or clinical stage showed no correlation of rare allele frequency with any sub-type.
Takeaway
Researchers looked at DNA from people with colorectal cancer and healthy people to see if certain gene variations were more common in cancer patients. They found some differences in common gene types but not in rare ones.
Methodology
Leucocyte DNA from 46 colorectal cancer patients and 49 healthy controls was analyzed using Southern blotting to assess Ha-ras gene variations.
Limitations
The study may not account for all sources of variability affecting DNA fragment size measurements.
Participant Demographics
46 colorectal cancer patients and 49 healthy controls with no family history of cancer.
Statistical Information
P-Value
p<0.025
Confidence Interval
95% confidence intervals for allele sizes
Statistical Significance
p<0.025
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