Methotrexate in Pediatric Osteosarcoma: Response and Toxicity in Relation to Genetic Polymorphisms and Dihydrofolate Reductase and Reduced Folate Carrier 1 Expression

1. Patiño-García, A.
2. Zalacaín, M.
3. Marrodán, L.
4. San-Julián, M.
5. Sierrasesúmaga, L.