Data collection in HBCRs involves several steps: 1. Case Finding: Identifying all new cancer cases diagnosed or treated at the hospital. This can be done through pathology reports, medical records, and other sources. 2. Data Abstraction: Extracting relevant information from patient records and entering it into the registry database. 3. Data Quality Control: Ensuring the accuracy and completeness of the data through regular audits and validation checks. 4. Data Analysis and Reporting: Analyzing the data to generate reports on cancer trends, treatment outcomes, and other metrics.