The document discusses various classes of anti-cancer drugs, including their mechanisms of action, pharmacokinetics, clinical uses, and common adverse effects. It covers alkylating agents, antimetabolites, plant alkaloids, antibiotics, hormonal agents, and other miscellaneous anti-cancer drugs. The classes of drugs discussed attack cancer cells through different mechanisms such as alkylation of DNA, inhibition of DNA synthesis, disruption of microtubule formation, and interference with hormone signaling pathways.