Certified Tumor Registrar (CTR) Practice Exam

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What information does the sequence number provide?

The location of the tumor
How many primary tumors the patient has
The treatment history of the patient
The histologic type of the tumor

The correct answer is: How many primary tumors the patient has

The sequence number is an important component in cancer data registries as it specifically indicates the number of primary tumors a patient has diagnosed over their lifetime. Each primary tumor is assigned a unique sequence number to differentiate it from other tumors. This is especially useful in tracking multiple primary malignancies, which can arise in a single patient. The use of sequence numbers helps in accurately documenting the patient's cancer history and in ensuring that the data reflects the complexity of their situation, enabling clinicians and researchers to analyze patterns in cancer incidence, treatment, and survival. In summary, the sequence number provides vital information regarding the multiplicity of a patient's cancer diagnoses, which is essential for effective cancer management and follow-up.