TOPICS: Cladribine, purine analog, break dna, dna polymerase, cell cycle nonspecific, hairy cell leukemia, multiple sclerosis, myelosuppression, nephrotoxicity, neurotoxicity, dizziness, headaches, cytarabine, arabinofuranosyl cytidine, pyrimidine analog, dna chain termination, s phase, dna polymerase, aml, lymphomas, myelosuppression, pancytopenia, megaloblastic anemia