Table 1. Incidence rate (per 100,000 person-years) and hazard ratios among patients with cancer of unknown primary in Sweden.

Subtype	No.	IR	HR	95%CI
Total	33,224	12.3	15.5	15.2	15.8
Histology
Adenocarcinoma	30,392	6.5	19.1	18.6	19.6
SCC	1,584	0.6	8.1	7.3	9.1
Melanoma	1,360	0.5	6.7	5.9	7.6
Undifferentiated	5,316	2.0	16.8	16.0	17.7
Location
Neck	1,630	0.6	8.6	7.7	9.5
Thorax	2,873	1.1	9.8	9.1	10.5
Abdomen	7,061	2.6	16.3	15.7	16.9
Liver	5,993	2.2	34.3	32.4	36.3
Skin	499	0.2	6.2	5.3	7.3
Brain	817	0.3	22.7	19.6	26.3
Bone	1,336	0.5	20.9	18.6	23.5
Suprarenal	564	0.2	11.2	9.6	13.0
Unspecified	11,312	4.2	16.3	15.7	16.9
Diagnosis period
1987–1999	17,390	13.0	21.6	20.9	22.3
2000–2012	15,834	11.6	18.2	17.6	18.7