Table S1.

Demographic and clinical features of the serum samples for training set

Cancer/disease	Clinical stage	Number of patients
Gastric cancer	I	7
	II	31
	III	57
	IV	3
	Unclear	2
	Total	100
Colorectal cancer	I	7
	II	55
	III	34
	IV	2
	Unclear	2
	Total	100
Benign diseases	Gastric diseasea	60
	Colorectal diseaseb	60
Other cancersc		50
Healthy people		250
	Total	620

Notes:

^aGastric benign disease includes gastritis, gastrohelcoma, gastroesophageal reflux, gastric polyps, and so on.

^bColorectal benign disease includes rectal polyp, colonitis, duodenal ulcer, colon colostomy, and so on.

^cOther cancers include breast cancer, esophageal cancer, ovarian cancer, liver cancer, cervical cancer, endometrial cancer, and lung cancer. The figures in bold are highlighted because they are the results of a total calculation for each sample type.