1. Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, SP, Brazil
2. Department of Clinical Oncology, Barretos Cancer Hospital, Barretos, SP, Brazil
3. Department of Pathology, Barretos Cancer Hospital, Barretos, SP, Brazil
4. Department of Head and Neck Surgery, Barretos Cancer Hospital, Barretos, SP, Brazil