A patient enters your facility in 1997 and is diagnosed with colon cancer. What would be the accession number for this patient diagnosed with colon cancer?

The accession number is a unique identifier assigned to each cancer case reported to a registry, typically including the year of diagnosis followed by a sequential number for the cases diagnosed within that year.

In this scenario, the patient was diagnosed with colon cancer in 1997, so the first part of the accession number reflects the year of diagnosis, which is 1997. The number that follows must be a sequential case number unique to that year. In this example, "00035" indicates that this is the 35th case recorded in that year.

The other options reflect years that are either outside of the diagnosis year or present sequential numbers that do not align with the year 1997, making them invalid for this particular case. Thus, the correctly formed accession number for a patient diagnosed with colon cancer in 1997 would be 199700035.