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Table 1 Main characteristics of the entire study population
| Characteristics | Patients with IIMs and cancer | Patients with CAMa | Patients with IIMs without cancer |
|---|---|---|---|
| Number of patients | 72 | 60 | 545 |
| Myositis subtype, n (%) | |||
| PM | 6 (8.3) | 3 (5.0) | 92 (16.9) |
| DM | 63 (87.5) | 56 (93.3) | 418 (76.7) |
| IMNM | 3 (4.2) | 1 (1.7) | 35 (6.4) |
| Male, n (%) | 26 (36.1) | 24 (40%) | 168 (30.8) |
| Age at myositis onset, mean ± SD years | 57.7 ± 14.2 | 58.0 ± 13.1 | 47.0 ± 14.1 |
| Age at cancer diagnosis, mean ± SD years | 57.5 ± 13.6 | 58.4 ± 12.9 | NA |
| Time from first symptoms to myositis diagnosis, mean ± SD months (n) | 12.3 ± 35.6 (72) | 7.9 ± 21.9 (60) | 22.1 ± 35.1 (512) |
| Cancer prior to the onset of myositis, mean ± SD, months (n) | 56.1 ± 91.3 (19) | 11.8 ± 13.4 (13) | NA |
| Cancer after the onset of myositis, mean ± SD, months (n) | 22.8 ± 42.8 (53) | 11.7 ± 12.5 (47) | NA |
| Follow up, median, IQR, months (n) | 20.0, 9.0–45.0 (67) | 19.0, 9.0–41.8 (55) | 34.0,15.0–63.0 (507) |
