Which statement about carcinogenesis is accurate?
a. An initiated cell will always become clinical cancer.
b. Cancer becomes a health problem once it is 1 cm in size.
c. Normal hormones and proteins do not promote cancer growth.
d. Tumor cells need to develop their own blood supply.
ANS: D
Tumors need to develop their own blood supply through a process called angiogenesis. An initiated cell needs a promoter to continue its malignant path. Normal hormones and proteins in the body can act as promoters. A 1-cm tumor is a detectable size, but other events have to occur for it to become a health problem.
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