HSPB1 and posterior cortical atrophy: Our findings of a decrease in HSPB1 mRNA expression associated with a more aggressive PCa phenotype is in contrast to studies of protein level expression of HSPB1 in PCa (Cornford et al, 2000; Kurahashi et al, 2007) and breast, ovarian and head and neck cancer (O’Callaghan-Sunol et al, 2007).