Which of the following characteristics is NOT typical of malignant tumors?

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Irregular and disordered cellular arrangementPresence of a well-defined capsulePenetration into blood vesselsFast and unpredictable growth rateAbility to spread to distant sites

Explanation

Malignant tumors generally exhibit irregular cell organization, invade blood vessels, grow rapidly and unpredictably, and can metastasize. However, they typically lack a well-defined capsule, which is more characteristic of benign tumors.