As shown in the figure, below, plots of deaths due to breast cancer and cervical
ID: 266791 • Letter: A
Question
As shown in the figure, below, plots of deaths due to breast cancer and cervical cancer in women differ dramatically from the same plot for colon cancer. At around age 50, the age-dependent increase in death rates for breast and cervical cancer slows markedly whereas death rates due to colon cancer (and most other cancers) continue to increase. Why do you suppose that the age-dependent increases in death rates for breast and cervical cancer slow after age 50? Use 2-3 sentences to respon 9. colon breast cervix 25 32 40 50 63 79 25 32 40 50 63 79 25 32 40 50 63 79 age (years) age (years) age (years) Figure: Cancer death rates as a function of age. ( breast cancer in females. (C) Death rates for cervical cancer. The data in all cases are plotted as log of the death rate versus the patient age (on a log scale) at death. The straight lines in (B) and (C) are fit to the data for the earlier age A) Death rates for colon cancer in females. (B) Death rates for groups, whereas the line in (A) is fit to all the data points.Explanation / Answer
9.
Cancers of the breast, cervix are thought to be influenced by endocrine secretions. Since, with increasing age, function of the endocrine decreases, as the receptors of the hormone, become less sensitive with age. Hence, breast and cervix cancer are thought to be decrease after 50.
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