The purpose of this prospective pilot clinical study is to evaluate the safety and immunostimulatory effect of intramuscularly administrations of autologous total IgG (autologous total IgG therapy) in healthy subjects and patients with advanced solid tumor (non-small cell lung cancer, stomach cancer, colon cancer, ovarian cancer, breast cancer, pancreatic cancer, biliary cancer, melanoma, renal cell carcinoma etc.). In addition, antitumor effect of intramuscularly administrations of autologous total IgG in patients with advanced solid tumor will be also evaluated.

After providing informed consent, study participants will be assessed for study eligibility at the screening visit. At screening visit (week -4), venous blood (320~400 mL) will be sampled using a double blood bag containing anticoagulant. Autologous plasma will be separated from the venous blood by centrifugation. During the 4 weeks of screening period, autologous total IgG (purity ≥97%) will be aseptically purified from the autologous plasma by chromatography using Protein A. Participants will receive the 8 intramuscular injections of autologous total IgG, twice a week for 4 weeks from baseline (week 0).

The investigators will evaluate the safety and immunostimulatory effect of intervention of this study by analyzing side effects, serum concentrations of immunological parameters (immunoglobulin, cytokine, etc.), and lymphocyte fraction by flow cytometry analysis of peripheral blood mononuclear cells.

[Part A) Autologous total IgG therapy in healthy subjects] The duration of this clinical study in healthy subjects is 16 weeks from the screening visit. A 4-week screening period will be followed by a 4-week intervention period and an 8-week follow-up period.

[Part B) Autologous total IgG therapy in patients with advanced solid tumor] The duration of this clinical study in patients with advanced solid tumor is 12 weeks from the screening visit. A 4-week screening period will be followed by a 4-week intervention period and a 4-week follow-up period(1 cycle).

If the patients agree to participate in additional long-term repeated study interventions at the end of 1st cycle of visit, patients will receive repeated study interventions in same the schedule up to week 44 (maximum 4 cycles). At the end of each cycle, antitumor effect will be evaluated by serum tumor marker concentrations, anatomical imaging, and Response Evaluation Criteria in solid tumors (RECIST ver. 1.1).

Inclusion Criteria:

1. Male or female, 19 years or older
2. Meeting the criteria for autologous blood donation 1) Body weight ≥32 kg (satisfying body weight limitation for planned sampling of 320 mL of venous blood volume) 2) Hemoglobin: ≥ 9 g/dL (Healthy volunteers Hemoglobin: ≥ 11 g/dL)
3. Provide signed informed consent
4. [Only for patients with advanced solid tumor] Patients with an Eastern Cooperative Oncology Group Performance Status (ECOG PS) ≤ 2 at the time of study enrollment.
5. [Only for patients with advanced solid tumor] Patients with a life expectancy longer than 3 months and metastatic (stage Ⅲ, Ⅳ) advanced solid tumor (non-small cell lung cancer, stomach cancer, colon cancer, ovarian cancer, breast cancer, pancreatic cancer, cholangiocarcinoma, malignant melanoma, renal cell carcinoma, etc.)
6. [Only for patients with advanced solid tumor] One or more target lesions must be present as confirmed by anatomical imaging (X-ray, CT sacn, MRI, etc.)

Exclusion Criteria:

1. Subjects under the age of 19 year, or unable to agree on their own (emergency patients, patients with mental disability, patients with limited capacity to consent due to stroke or delirium caused by diabetes), or severe disease whose expected survival duration is less than 3 months
2. Pregnancy or planned pregnancy within 1 year
3. Subjects who participated on another investigational device or drug studies within 4 weeks prior to screening visit
4. Medical history of alcohol or drug abuse within 2 years of the screening visit
5. Subjects is a member of the investigational team
6. Unable to comply with all clinic visits and study-related procedures
7. Planned or anticipated major surgical procedure within 4 weeks prior to baseline visit
8. [Only for patients with advanced solid tumor] A well-treated patients in combination with surgery and radiotherapy
9. [Only for patients with advanced solid tumor] Uncontrolled infections (bacterial, viral, fungal infection)
10. [Only for patients with advanced solid tumor] Has known active brain metastases(except for subjects with adequate treated and neurological asymptomatic at least 2 weeks, subjects without neurological symptoms without treatment for brain metastases, also subjects must be either off corticosteroid for corticosteroid therapy, or who have received stable doses of prednisone less than 10mg daily or who have received reduced doses may be enrolled.