CET Cancer Registry Data Collection 2

Question 1

Which coding system is used to classify cancer primary sites and histologies in cancer registries?

Accepted Answer

ICD-O-3

Answer

ICD-O-3 (International Classification of Diseases for Oncology, 3rd Edition) is the standard coding system for classifying cancer by site (topography) and cell type (morphology).

Question 2

In ICD-O-3 morphology codes, what does a behavior code of '/2' indicate?

Accepted Answer

In situ

Answer

A behavior code of /2 indicates carcinoma in situ, meaning cancer cells are present but have not invaded surrounding tissue.

Question 3

What does 'laterality' code '2' represent for a paired organ in ICD-O-3?

Accepted Answer

Left side

Answer

In ICD-O-3, laterality code 2 represents the left side of a paired organ such as the lung, kidney, or breast.

Question 4

What is the 'primary site' in cancer registry terminology?

Accepted Answer

The organ or tissue where the cancer first developed

Answer

The primary site is the organ or tissue of origin where the malignancy first arose, regardless of where it subsequently spread.

Question 5

Which ICD-O-3 histology code range represents adenocarcinomas?

Accepted Answer

8140–8389

Answer

Adenocarcinomas, which are glandular malignancies, are coded in the 8140–8389 range within the ICD-O-3 morphology classification.

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CET Cancer Registry Data Collection 2