Final answer:
An antitumorigenic agent inhibits tumor development by targeting specific molecules or pathways involved in tumor formation and growth.
Step-by-step explanation:
An antitumorigenic agent is actually an agent that inhibits tumor development. This means that it has the ability to stop or slow down the growth of tumors. These agents can work by targeting specific molecules or pathways involved in tumor formation and growth. For example, some antitumorigenic agents may block the activity of tumor suppressor genes, which play a key role in preventing the development of cancer.