Inclusion Criteria:

• Aged 19 years or older
• Subjects who have been diagnosed with stages 1 to 4 of solid tumor or healthy volunteers who have scheduled a cancer screening examination
• Subjects who have agreed to provide clinical information and blood samples
• Subjects who have agreed for the storage and secondary use of residual blood samples for research
• Subjects who have understood the study and are able to provide a written informed consent

Exclusion Criteria:

• Subjects who are not appropriate for the study because of intellectual disabilities or severe mental disorders
• Subjects with a history of HIV, HTLV, or Syphilis infection
• Subjects with primary site unknown cancer or synchronous or metachronous double primary cancers
• Subjects who have diagnosed with any other malignant tumor within the past 5 years (except for cured non-melanoma skin cancer, in situ cancer, or thyroid cancer)