GP5 and posterior cortical atrophy: Recently, upon investigating the actual underlying 3D architecture of separate growth patterns, we recognized two PCa growth pattern families: (i) those in which all tumour cells contact surrounding stroma including GP3, poorly‐formed and fused GP4, single cells and cords GP5, and (ii) those in which most tumour cells do not contact adjacent stroma including cribriform GP4 and solid GP5 either with or without comedonecrosis.4