The purpose of this study is to evaluate sensitivity and specificity of newly defined tumor biomarker with gastric cancer pts and cancer-free healthy volunteers.

Measurements of specific glycosylation changes in serum haptoglobin.

Arm1 (Gastric cancer patient)

1. Inclusion Criteria:

   • Male or female over 19 years
   • Patients with histologically Gastric Cancer (included Gastroesphageal junction)
   • Primary gastric cancer or/and metastatic gastric cancer.
   • Understand and voluntarily sign an informed consent document prior to any study related assessments/procedures are conducted

2. Exclusion Criteria:

   • Prior or present history of malignancies other than gastric cancer
   • Any condition that confounds the ability to interpret data from the study under the investigational confirmed.

Arm2 (Cancer-free healthy volunteers)

1. Inclusion Criteria:

   • Male or female over 19 years
   • Cancer-free status.
   • Understand and voluntarily sign an informed consent document prior to any study related assessments/procedures are conducted

2. Exclusion Criteria:

   • Prior or present history of malignancies (included gastric cancer)
   • Any condition that confounds the ability to interpret data from the study under the investigational confirmed

Arm1- Gastric cancer patient: 150 subjects Arm2- Cancer-free healthy volunteers : 203