AntimetabolitesMethotrexateAntimetabolites, AntineoplasticFloxuridineTetrahydrouridineTrabeculectomyFolic Acid AntagonistsInosine MonophosphateLeukemia L1210FluorouracilPhosphoribosyl Pyrophosphate6-MercaptopurineCytarabineMitomycinPolyglutamic AcidPurinesAntirheumatic AgentsAntineoplastic AgentsDrug SynergismTetrahydrofolate DehydrogenaseDrug Screening Assays, AntitumorCell SurvivalDeoxycytidineDrug Evaluation, PreclinicalTumor Cells, CulturedArthritis, RheumatoidNeoplasmsAminopterinCell DivisionReduced Folate Carrier ProteinCell LineCell CycleTrimetrexateKineticsFolic Acidgamma-Glutamyl HydrolaseDrug Therapy, CombinationLeucovorinTetrahydrofolatesAbortifacient Agents, NonsteroidalCyclophosphamideDrug ResistanceTreatment OutcomeAntineoplastic Combined Chemotherapy ProtocolsImmunosuppressive AgentsSulfasalazineVincristineDeoxyuridinePrecursor Cell Lymphoblastic Leukemia-LymphomaDrug Administration ScheduleDermatologic AgentsPregnancy, EctopicFormyltetrahydrofolatesFolate Receptors, GPI-AnchoredDose-Response Relationship, DrugDoxorubicinPhosphoribosylaminoimidazolecarboxamide FormyltransferaseOsteosarcoma