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Table 3 Incidence for specific cancer types after diagnosis of dermatomyositis and polymyositis

From: Cancer risks of dermatomyositis and polymyositis: a nationwide cohort study in Taiwan

Cancer type Dermatomyositis group (n = 1,012) Polymyositis group (n = 643)
  Observeda Expectedb SIR (95% CI) Observeda Expectedb SIR (95% CI)
Nasopharynx 30 0.21 139.94 (137.79 to 148.06) 2 0.16 12.71 (10.83 to 14.36)
Lungc 22 1.07 20.58 (19.71 to 21.44) 5 0.93 5.38 (4.92 to 5.87)
Breast 9 2.55 3.53 (3.30 to 3.77) 3 1.80 1.67 (1.48 to 1.87)
Uterus 0 - - 1 0.14 7.13 (5.81 to 8.69)
Uterine cervix 3 0.91 3.28 (2.93 to 3.68) 1 0.70 1.44 (1.16 to 1.74)
Ovaryc 2 0.38 5.33 (4.56 to 6.05) 0 - -
Lymphoma/leukemia 4 0.16 24.70 (22.61 to 27.57) 1 0.13 7.78 (6.26 to 9.36)
Oropharynx and larynx 1 0.13 7.46 (6.26 to 9.36) 0 - -
Esophagus 1 0.33 3.06 (2.47 to 3.69) 0 - -
Liver/gall bladder 5 1.38 3.62 (3.31 to 3.96) 4 1.20 3.34 (3.01 to 3.68)
Colorectum 5 1.21 4.12 (3.78 to 4.51) 5 1.06 4.70 (4.31 to 5.15)
Stomach 1 0.97 1.03 (0.84 to 1.25) 0 - -
Pancreas 1 0.33 3.04 (2.47 to 3.69) 1 0.29 3.44 (2.81 to 4.19)
Kidney 3 0.51 5.93 (5.24 to 6.59) 1 0.45 2.22 (1.81 to 2.70)
Urinary bladder 2 0.49 4.05 (3.54 to 4.69) 2 0.44 4.59 (3.94 to 5.22)
Melanoma 1 0.23 4.33 (3.54 to 5.29)- 2 0.20 9.76 (8.66 to 11.49)
Bone/joint 1 0.07 14.87 (11.62 to 17.38) 2 0.05 39.64 (34.65 to 45.94)
Brain 0 - - 2 0.11 18.21 (15.75 to 20.88)
Thyroid 2 0.45 4.49 (3.85 to 5.10) 1 0.32 3.12 (2.54 to 3.80)
Metastatic cancersc 2 0.56 3.57 (3.09 to 4.10) 0 - -
  1. aObserved cancer cases. bExpected cancer cases based on estimates of the general population in Taiwan, after age and gender adjustment. cLung, including lung and mediastinum; ovary, including ovary and fallopian tube; metastatic cancers, including cancers of ill-defined or unknown origin. CI, confidence interval; SIR, standardized incidence ratio.