Final answer:
A cancer registrar primarily collects data on malignant cancers, can also track benign yet aggressive tumors, and is responsible for submitting data to a state or national registry.
Step-by-step explanation:
A cancer registrar collects, compiles, documents, and manages data from cancer patients. They are concerned primarily with malignant cancers, tracking patient outcomes, treatment methods, survival rates, and epidemiological data. This information is often used for research, treatment improvement, and cancer prevention strategies. Additionally, they may also collect data on benign yet aggressive tumors, although their primary focus is usually on malignant cases. Lastly, a crucial role of a cancer registrar is to submit data to a state or national cancer registry, where it can be used for broader statistical analyses and to inform healthcare policy.
The duties of a cancer registrar align with the scenario described in criterion number 3, where diagnosis at an unusually young age, multiple different cancers in the same individual, familial patterns of cancer, and bilateral occurrences of cancer are noteworthy factors for data collection and analysis. This criterion suggests the cancer registrar's role in contributing to a deeper understanding of the factors that might prompt a detailed investigation of a patient's cancer diagnosis for research and public health purposes.