Inclusion/Exclusion Criteria

Which patients are included in the audit?

The audit includes all patients with a primary diagnoses of bowel cancer within the current report period. Included patients must be:

1) Aged 18 or older at the date of diagnosis
2) Diagnosed in the audit period (April-March)
3) Diagnosed with colorectal cancer for the first time, with one of the following ICD10 codes:

  • C18 Malignant neoplasm of colon
  • C20 Malignant neoplasm of rectum
  • C19 Malignant neoplasm of rectosigmoid junction

Non Primary Cancers (recurrences and progressions) should also be submitted to NDRS in England.

The following patients are excluded from the audit:
• Sarcomas
• Lymphoma
• Neuroendocrine/Carcinoid tumours
• Melanoma

Does the audit include patients with anal cancer?

No. From 1 April 2022 the audit no longer collects patients with a primary diagnoses of anal cancer (ICD10 code C21).

Do all patients require a histological diagnosis to be included?

If a patient is deemed palliative, and they are unfit for a biopsy, and the MDT consensus is that this a colorectal malignancy, the patient should be included in NBOCA.

Which procedures are included as a major resection?

• H04 Total excision of colon and rectum
• H05 Total excision of colon
• H06 Extended excision of right hemicolon
• H07 Other excision of right hemicolon
• H09 Excision of left hemicolon
• H10 Excision of sigmoid colon
• H11 Other excision of colon
• H29 Subtotal excision of colon
• H33 Excision of rectum
• X14 Clearance of pelvis
• H40.4 Trans-sphincteric anastomosis of colon to anus
• H41.1 Rectosigmoidectomy and peranal anastomosis
• H41.4 Peranal mucosal proctectomy and endoanal anastomosis
• H47.9 Unspecified excision of anus