Figure 4From: The development of common data elements for a multi-institute prostate cancer tissue bank: The Cooperative Prostate Cancer Tissue Resource (CPCTR) experience CPCTR Critical Data Fields. The critical data fields are divided into two categories$: 1) Required fields, which are essential and must be entered into the database for a case to be accepted. 2) Conditional required fields, which must be filled out when the respective tissue matrix is entered into the Resource.Back to article page