Nat. Rev. Urol. doi:10.1038/nrurol.2018.9 Figure 3 Heterogeneous immunohistochemical expression of ERG and PTEN in prostate tumours Figure 3 | Heterogeneous immunohistochemical expression of ERG and PTEN in prostate tumours. a | Heterogeneous phosphatase and tensin homologue (PTEN) loss is observed in some tumour glands (N), with intact staining in other tumour glands (P), whereas the same areas are uniformly positive for ERG expression, indicating that clonal ERG genomic rearrangement is probably present with subsequent subclonal PTEN loss. b | Heterogeneous PTEN loss is seen in some tumour glands (N), with intact staining in other tumour glands (P), whereas the same areas are uniformly negative for ERG expression (ERG genomic rearrangement is absent). Jamaspishvili, T. et al. (2018) Clinical implications of PTEN loss in prostate cancer Nat. Rev. Urol. doi:10.1038/nrurol.2018.9