Table 1.

Coding categories for breast cancer histologies reported in Million Women Study participants

NHSBSP descriptive data	ONS ICD-02 codes
Invasive ductal carcinoma	8022/3, 8141/3, 8201/3, 8500/3, 8501/3, 8521/3
Invasive lobular carcinoma	8520/3
Invasive tubular carcinoma	8211/3
Invasive mixed carcinoma	8522/3
Invasive mucinous carcinoma	8480/3
Other specified invasive histology	8041/3, 8050/1, 8200/3, 8246/3, 8401/3, 8810/3, 8502/3, 8503/3, 8504/3, 8550/3, 8560/3, 9020/3
Non-specified invasive histology	8530/3, 8140/3, 8000/3, 8001/3, 8003/3, 8010/3
Ductal carcinoma in situ	8230/2, 8500/2, 8500/5, 8501/2, 8501/5, 8521/2
Lobular carcinoma in situ	8520/2, 8520/5
Ductal + lobular carcinoma in situ	8522/2
Pagets	8540/3
Other specified non-invasive histology	8543/3, 8504/2, 8503/2, 8480/5, 8480/2, 8200/2, 8070/2, 8050/5, 8050/2
Non-specified non-invasive histology	8010/2, 8010/5, 8210/2
Unable to code	8000/1, 8520, 8500/6

ICD, International Classification of Diseases; NHSBSP, National Health Service Breast Screening Programme; ONS, Office for National Statistics.