Observed (Obs) and expected (Exp) numbers of specific cancer cases and standardised incidence ratios (SIR) with 95% confidence intervals (CI) among patients with rheumatoid arthritis in 1979–99, by treatment and cancer site
| Yttrium | No yttrium | |||||||
|---|---|---|---|---|---|---|---|---|
| Site | Obs | Exp | SIR | 95% CI | Obs | Exp | SIR | 95% CI |
| Stomach | 1 | 0.9 | 1.1 | 0.03 to 6.1 | 8 | 6.3 | 1.3 | 0.6 to 2.5 |
| Colon, rectum | 3 | 1.6 | 1.9 | 0.4 to 5.6 | 12 | 11.2 | 1.1 | 0.6 to 1.9 |
| Liver | 0 | 0.1 | 0.0 | 0.0 to 27 | 1 | 1.0 | 1.1 | 0.03 to 5.8 |
| Lung, bronchus | 1 | 1.4 | 0.7 | 0.02 to 4.0 | 17 | 11.0 | 1.5 | 0.9 to 2.5 |
| Breast | 0 | 2.4 | 0.0 | 0.0 to 1.5 | 20 | 18.5 | 1.1 | 0.7 to 1.7 |
| Non-Hodgkin’s lymphoma (nodal) | 0 | 0.3 | 0.0 | 0.0 to 11 | 6 | 2.4 | 2.5 | 0.9 to 5.4 |
| Hodgkin’s lymphoma | 0 | 0.1 | 0.0 | 0.0 to 79 | 0 | 0.4 | 0.0 | 0.0 to 9.7 |
| Myeloma | 0 | 0.3 | 0.0 | 0.0 to 15 | 2 | 1.8 | 1.1 | 0.1 to 4.1 |
| Leukaemia | 1 | 0.3 | 2.9 | 0.07 to 16 | 1 | 2.4 | 0.4 | 0.01 to 2.3 |