Human Epidermal Growth Factor Receptor-2 gene polymorphism and breast cancer risk in women from the Northeastern region of Brazil Carla Solange Escórcio-Dourado; Francisco Adelton Alves-Ribeiro; Jose Charles Lima-Dourado; Alesse Ribeiro dos Santos; Renato de Oliveira Pereira; Cleciton Braga Tavares; Vladimir Costa Silva; Pedro Vitor Lopes Costa; José Maria Soares-Júnior; Benedito Borges da Silva;