Melanoma is a type of cancer that produces a black pigmented skin tumor. Its inc

Question

Melanoma is a type of cancer that produces a black pigmented skin tumor. Its incidence is on the rise. For this and other reasons a great deal of research is concentrating on this type of cancer. It has been hypothesized that injections of a vaccine containing chemical substances shed by melanoma cells grown in tissue culture might stimulate the body’s immune system, therefore helping to reduce the tumor’s growth. To test this hypothesis, 50 melanoma patients will be given this experimental vaccine. What would be an adequate control?

a. A group of 50 individuals without melanoma should be given the injections.
b. A group of 50 individuals with melanoma should be given an injection of placebo.
c. A group of 50 individuals with melanoma should be given the vaccine injections.
d. A group of 50 individuals without melanoma should be given an injection of the placebo.

Explanation / Answer

d. A group of 50 individuals without melanoma should be given an injection of the placebo

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