Frequently asked questions
Action of chemical substances on organs: carcinogenesis

macroscopic observation: benign tumors are well-limited tumors, separated from healthy tissue; they vary in size; their shape varies according to the site of the tumor: nodule, polyp...

microscopic (histological) observation: these are well-differentiated tumors, resembling normal tissue; tumor cells resemble normal cells; relationships between epithelial structures and connective structures (basement membrane) are preserved; there is no invasion of healthy tissue;

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