1. Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, SP 14784 400, Brazil
2. Medical Oncology Department, AC Camargo Cancer Center, S�o Paulo, SP 01509‑010, Brazil
3. Kyolab Laborat�rio de Pesquisa Farmac�utica Ltda, Valinhos, SP 13273‑105, Brazil