CHEM 181 Study Guide - Midterm Guide: Mortality Rate, Twin, Menopause

• School: McGill University
• Department: Chemistry
• Course: CHEM 181
• Professor: Joe Schwarcz

Document Summary

~90% of the causes are associated with the environment. Genetics 5-10: check study below: even with genetic factors, environmental factors dominate. Scandinavia: 45,000 pairs of twins; 10,000 cancers occurred: some cancers showed heritable factors. Stomach cancer: environmental, shared 10, non-shared 62, heritable 28% Cervical cancer: environmental -- high, heritable low. Identical (monozygotic) twins have ~15% higher risk, fraternal twins only ~6% Conclusion: unmistakable hereditary 1, major component hereditary 15% Comes from latin term for crab, bc tumors resembled crabs. More than 1/2 million people in the us die of cancer every year: 1,500 americans/day. At one time, increase in cancer rates mostly bc of better diagnosis. Overall, the general cancer rates are the same. Breast cancer rates are decreasing: began decreasing when estrogen supplements for menopause ceased. In some areas, some cancers are more common than others: when people migrate from another country, tend to take on cancer patterns of the.