[1] Univ Fed Sao Paulo, Dept Morfol & Genet, Disciplina Genet, Sao Paulo, Brazil
[2] Univ Fed Sao Paulo, Dept Ortoped & Traumatol, Sao Paulo, Brazil
[3] Univ Fed Sao Paulo, Dept Cirurgia, Discipline Gastroenterol Cirurg, Sao Paulo, Brazil
[4] Univ Fed Para, Hosp Univ Joao Barros Barreto, Nucleo Pesquisas Oncol, Belem, Para, Brazil
[5] Univ Fed Sao Paulo, Dept Patol, Sao Paulo, Brazil
[6] Univ Fed Para, Inst Ciencias Biol, Lab Citogenet Humana, Belem, Para, Brazil
[7] Hosp Ophir Loyola, Lab Biol Mol, Belem, Para, Brazil