Table 1. Clinical characteristics of the controls and patients.

Variables	Patients (n = 1,000)	Controls (n = 1,000)	P-value
Age at diagnosis	65.2 ± 6.1	64.8 ± 4.7	0.100
Family history of cancer
Yes	99	21	P < 0.001
No	901	979
Smoking status
Never	877	918	0.003
Ever	123	82
Drinking status
Never	746	793	0.766
Ever	254	207
Body mass index
< 25 kg/m2	500	511	0.623
≥ 25 kg/m2	500	489