Regorafenib and Nivolumab Simultaneous Combination Therapy

Inclusion Criteria

• Patients who provided written informed consent to be subjects in this trial
• Patients at least 20 years of age on the day of providing consent
• Dose-escalation cohort: Patients with histologically or cytologically confirmed advanced or metastatic solid tumors.

Expansion cohort: Patients with histologically or cytologically confirmed advanced or metastatic solid tumors (gastric, colorectal, or hepatocellular cancer).

• Patients with an Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 or 1
• Patients capable of taking oral medication
• Patients with evaluable or measurable lesions as per RECIST version 1.1
• Patients with adequate organ function at the time of enrollment as defined below:
• Neutrophil count ≥1500mm3
• Platelet count ≥10.0 × 104/mm3
• Hemoglobin (Hb) ≥ 9 g/dL,
• aspartate transaminase (AST), alanine transaminase (ALT) ≤100 U/L (≤100 U/L in patients with Hepatocellular carcinoma, ≤250 U/L in patients with liver metastasis)
• Total bilirubin ≤1.5-mg /dL
• Creatinine ≤1.5--mg /dL
• Lipase ≤ 80 IU/L
• Urinary protein: It satisfies one of the following (if any of the inspection criteria are satisfied, other examination may not be carried out) (i) urinary protein (test paper method) is 2+ or less (ii) Urine Protein Creatinine(UPC) ratio <3.5 (iii) 24-hour urine protein was measured, urinary protein ≦ 3500 mg
• Prothrombin time (PT)- International normalized ratio(INR): ≤ 1.5 (≦ 3.0 in case of anticoagulant administration)
• For women who are likely to become pregnant (including those without menstruation due to medical reasons such as chemical menopause) Note 1, we agreed to double contraceptive Note 2 for at least 5 months from consent acquisition patient to the final administration of the investigational product. Also, patients who agreed not to breast feeding for at least 5 months from acquiring consent to the final investigational drug administration.

For men, patients agreeing to double contraceptive for at least 7 months from the time of starting investigational drug administration to the final investigational drug administration.

Note 1): A woman who is likely to become pregnant is a woman who has experienced menarche and is not undergoing sterilization surgery (such as hysterectomy, bilateral salpingo ligation or bilateral oophorectomy), a woman without menopause Everything is included. The definition after menopause shall be amenorrhea continuously for 12 months or more even though there is no noteworthy reason. Women who are using oral contraceptives or mechanical contraceptive methods (such as intrauterine contraceptive devices or barrier methods) are considered to be pregnant.

Note 2): With regard to contraception, it is necessary to use two of the vasectomy or condom of a male patient or male male, the uterine tube ligation of a female patient or the other woman, a contraceptive pessary, an intrauterine contraceptive device or an oral contraceptive I need to agree to heavy contraception.

Exclusion Criteria

• Patients who have undergone systemic chemotherapy, radiotherapy, surgery, hormone therapy, or immunotherapy <2 weeks before enrollment. Immune checkpoint blockade as pretreatment is permitted.
• Patients with a history of taking regorafenib.
• Patients with hypertension that is difficult to control (systolic blood pressure ≥160 mmHg and diastolic blood pressure ≥90 mmHg) despite treatment with several hypotensive agents
• Patients with acute coronary syndrome (including myocardial infarction and unstable angina), and with a history of coronary angioplasty or stent placement performed within 6 months before enrollment
• Patients with a large amount of pleural effusion or ascites requiring drainage.
• Patients with a ≥grade 3 active infection according to NCI-CTCAE version 4.03
• Patients with symptomatic brain metastasis
• Patients with partial or complete gastrointestinal obstruction
• Patients with interstitial lung disease with s