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Table 1 Agreement between TACT dataset and NCDR extraction

From: Can routine data be used to support cancer clinical trials? A historical baseline on which to build: retrospective linkage of data from the TACT (CRUK 01/001) breast cancer trial and the National Cancer Data Repository

Variables NCDR component dataset Agreement, n (%) No Agreement, n (%) Missing, n (%)
Date of birth, (n = 3047) Cancer Registry and HES 3036 (99.6) 11 (0.4)
Date of surgerya, (n = 2929) HES 2892 (98.7) 37 (1.3)
Date of deathb, (n = 739) Cancer Registry 662 (89.6) 59 (8.0) 18 (2.4)
Nodal statusc, (n = 2941) Cancer Registry 1709 (58.0) 26 (1.0) 1206 (41.0)
Nodes involvedc, (n = 2941) Cancer Registry 1581 (53.8) 85 (2.8) 1275 (43.3)
Nodes examinedc, (n = 2041) Cancer Registry 1469 (50.0) 229 (7.8) 1238 (42.2)
Tumour sizec, (n = 2941) Cancer Registry 2075 (70.6) 211 (7.2) 651 (22.1)
Side of tumourc, (n = 2941) Cancer Registry 2850 (96.9) 46 (1.6) 44 (1.5)
Tumour gradec, (n = 2941) Cancer Registry 2181 (74.5) 668 (22.8) 79 (2.7)
  1. TACT Taxotere and Adjuvant ChemoTherapy, NCDR National Cancer Data Repository, HES Hospital Episode Statistics
  2. aMatches using NHS number, date of birth and patient’s name and surname
  3. bDenominator = number of deaths in TACT once linked to the Cancer Registry
  4. cMatches using NHS number, date of birth and patient’s name. Clinical status assessed within 90 days from date of surgery as entered in TACT