4. The major risk factor for cancers of the oral cavity, larynx and esophagus is (A) Oral contraceptives (B) Environmental pollution (C) Cigarette smoking (D) Vitamin deficiencies (E) Chronic alcoholism

1. Malignant tumors are characterized by the following findings, except (A) Tumors remain localized, will not spread to other sites, and are amenable to local surgical removal (B) Tumors can invade and destroy adjacent structures and spread to distant sites (metastasize) to cause death (C) Lack of differentiation (D) Pleomorphism (E) Mitoses

4. The major risk factor for cancers of the oral cavity, larynx and esophagus is
(A) Oral contraceptives
(B) Environmental pollution
(C) Cigarette smoking
(D) Vitamin deficiencies
(E) Chronic alcoholism

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