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48 Volume Outcome KCE reports 113
5.2.3.2 Linkage with data from IMA and BCR
The Minimal Clinical Data (MCD) data were linked with the Common Sickness Funds
Agency (IMA) database and the Belgian Cancer Registry (BCR) database. Table 5.5
shows that 95.9% of 343 MCD stays could be linked with IMA data and 79.9% with BCR
data (on the basis of ICD-10 codes C15 and C16.0). As was to be expected on the basis
of the percentage in Table 4.2 (see page 38) information on tumour stage could only be
retrieved for 67.4% of 343 MCD stays. However, this percentage varies strongly among
the hospitals as is shown in Figure 5.1 where the red columns indicate the procedures
for which stage is missing.
Table 5.5: Oesophageal cancer surgery: Percentage of linkage of MCD data
with data from IMA and BCR
Number Percent
Number of stays in MCD selection 343 100
Linkage with IMA 329 95.9
Linkage with BCR 274 79.9
Linkage with BCR and information on stage 231 67.4
Results of linkage: 274 patients with oesophageal cancer surgery could be
linked with Belgian Cancer Registry data. For 231 of these patients, the BCR
contained information on the stage of the tumour.
5.2.3.3 Patient and tumour characteristics
Tumour location is defined according to the ICD-10 code:
• C15 for malignant neoplasm of oesophagus
• C16.0 for malignant neoplasm of cardia.
Two main types of oesophageal cancer are squamous cell carcinoma and
adenocarcinoma. Tumour histology is according the histological groups defined by the
International Agency for Research on Cancer (IARC) on the basis of the following ICD-
O-3 codes: 125
• squamous cell carcinoma: 8050-8078, 8083-8084
• adenocarcinoma: 8140-8141, 8143-8145, 8190-8231, 8260-8263, 8310,
8401, 8480-8490, 8550-8551, 8570-8574, 8576.
For a detailed description of TNM classification and TNM stages for oesophageal
119, 121
cancer, we refer to the Belgian national guidelines.
As shown in Table 5.6, the mean age of patients was 64 years (median age is 65 years)
and 80.2% of them were men. The majority of patients had an oesophagus cancer
(69.3%). The predominant histological type of tumour was adenocarcinoma (67.1%).
Twenty-two per cent of patients had stage 1 oesophageal cancer, 32.5% had stage 2,
37.2% had stage 3 and 8.2% had stage 4 disease.