Can you explain in detail how carcinogens result in cancerous tumors

Can you explain in detail how carcinogens result in cancerous tum…?

http://www.chacha.com/question/can-you-explain-in-detail-how-carcinogens-result-in-cancerous-tumors

Abnormalities in the cells occur due to the effects of carcinogens, which are substances that cause cancer.