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Trial in Korea, for in patients diagnosed with metastatic or recurrent colorectal cancer.

Nelmastobart (hSTC810): a humanized monoclonal antibody targeting BTN1A1, immunotherapy. Intravenous.
Capecitabine: 5-Fu precursor (Xeloda), chemotherapy, oral.

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Inclusion Criteria

Inclusion Criteria:

Male or female subject ≥18 years of age at the time of signing the informed consent form (ICF).
Subjects with histologically or cytologically confirmed colorectal adenocarcinoma who have failed or are ineligible for oxaliplatin and irinotecan-based chemotherapy.

Subjects with advanced/metastatic solid tumors, with evaluable lesion as determined by Response Evaluation Criteria In Solid Tumors (RECIST) Version 1.1.

Measurable lesion is optional.

Eastern Cooperative Oncology Group Performance Status (ECOG PS) ≤2.

Adequate organ and bone marrow function characterized by the following at screening:

Absolute neutrophil count(ANC) ≥1.0 × 109/L;b.
Platelets ≥75 × 109/L;c.
Hemoglobin ≥9.0 g/dL (with or without blood transfusions).
Adequate renal function defined by Serum creatinine ≤ ULN x 1.5 or an estimated creatinine clearance ≥30 mL/min according to the Cockcroft Gault formula or by 24-hour urine collection for creatinine clearance, or according to local institutional standard method.
Serum total bilirubin ≤2.0 x upper limit normal (ULN), if a subject with biliary obstruction is considered suitable if they meet the criteria after appropriate bile drainage.
ALT and AST ≤ 3 × ULN, or ≤5 × ULN in the presence of liver metastases.
Adequate cardiac function: QTc ≤480 msec; if QTc exceeds 480 msec, subjects can be enrolled if the average QTc value is less than 480 msec by measuring 3 times consecutively in total.
The subject is able to swallow and retain oral medication
Serum β hCG test negative within 14 days before the first administration of the study treatment (women of childbearing potential only)

Requirement for contraception must be observed by the subject.

Eligible women (all women of reproductive potential who are either undergoing clinical trial treatment or within 4 weeks after discontinuing clinical trial treatment, and who are not using appropriate contraception) must use the following contraceptive methods to be eligible for enrollment.
Subjects must abstain from all forms of sexual intercourse and are encouraged to practice consistent abstinence in their daily lives. Periodic abstinence methods (e.g., calendar-based methods, cervical mucus observation, basal body temperature methods, etc.) and withdrawal are not considered acceptable contraceptive methods.
Accepted infertility surgical procedures: Bilateral oophorectomy with or without hysterectomy; Tubal ligation at least 6 weeks before enrollment in this clinical trial. Bilateral oophorectomy is only allowed if the subject's potential for pregnancy is confirmed through hormone level assessment.
In the case of female participants in the clinical trial, their male partners who have undergone vasectomy (screening performed at least 6 months prior) should be their exclusive partners during the participation in this clinical trial
During the clinical trial, male participants should use condoms during sexual intercourse while they are receiving the investigational drug and for up to 1 month after discontinuing the treatment (after the last dose).
Life expectancy of at least 12 weeks. Capable and willing to give signed informed consent which includes compliance with the requirements and restrictions listed in the ICF and in the protocol.
Subject has signed the Informed Consent Form (ICF) prior to any screening procedures being performed

Exclusion Criteria

Exclusion Criteria:

Patient has a known or suspicious hypersensitivity to fluoropyrimidines.
Any cytotoxic chemotherapy from a previous treatment regimen within 14 days. If the subject received an investigational drug from another clinical trial, the subject can be enrolled after 2 weeks of last administration and more than 5 x half-life of the investigational drug. If monoclonal antibody therapy was given, the subject can be enrolled after four weeks after the last dose.
Uncontrolled severe infection

Subjects with conditions requiring high doses of steroids (>10 mg/day of prednisone or equivalent) or other immunosuppressive medications are excluded, all of the following will not be excluded:

Brief (<7 days) use of systemic corticosteroids is allowed when use is considered standard of care.
Subjects requiring intermittent use of bronchodilators, inhaled steroids, or local steroid injections will not be excluded.
Replacement therapy (e.g., thyroxine, insulin, physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency) is not considered a form of systemic treatment and is allowed.
Subjects who are pregnant or breastfeeding women.
History of autoimmune disease that has required systemic treatment in the past 2 years (i.e., with use of disease modifying agents, corticosteroids, or immunosuppressive drugs). Subjects with vitiligo, psoriasis not requiring systemic treatment, type 1 diabetes mellitus, hypothyroidism stable with hormone replacement, Sjögren's syndrome, or resolved childhood asthma/atopy will not be excluded.
Active central nervous system (CNS) lesions (i.e., those with radiologically unstable or symptomatic brain lesions). For those who receive radiation or surgical treatment, the subject can be enrolled if the subject is maintained without steroid therapy and the evidence of CNS disease progression for more than 4 weeks. However, patients with leptomeningeal metastases are excluded.
Subjects with a documented history of a cerebral vascular event (stroke or transient ischemic attack), unstable angina, myocardial infarction, or cardiac symptoms consistent with New York Heart Association (NYHA) Class IV within 6 months prior to screening.
Subjects with a history of idiopathic pulmonary fibrosis, organizing pneumonia, drug induced pneumonitis, idiopathic pneumonitis, or evidence of active pneumonitis on screening chest computerized tomography (CT) scan.
Subjects who have received a prior allogeneic stem cell or solid organ transplant.
Subjects who have received a live attenuated vaccine within 30 days prior to screening. Examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, varicella/zoster (chicken pox), yellow fever, rabies, Bacillus Calmette Guérin, and typhoid vaccine. Seasonal influenza vaccines for injection are generally killed virus vaccines and are allowed; however, intranasal influenza vaccines (e.g., FluMist®) are live attenuated vaccines and are not allowed.

History of other primary cancer. Exceptions are as follows:

- Adequately treated non-melanoma skin cancer (basal cell or squamous cell carcinoma), curatively treated in situ cancer of the cervix or stage I bladder cancer, completely resected thyroid cancer without distant metastasis in which all treatment has been completed (Appropriate wound healing is required prior to clinical trial enrollment)

Subject has not recovered to ≤ grade 1 (except alopecia) from related adverse effects of any prior anticancer therapy.
Radiotherapy with a wide field (more than 30% of the bone marrow) of radiation within 4 weeks or radiotherapy with a limited field of radiation for palliation within 2 weeks of the first dose of study treatment.
Subject who has undergone major surgery ≤ 4 weeks prior to starting study treatment or who has not recovered from adverse effects of such procedure.
Subjects with impaired gastrointestinal (GI) function or GI disease that may significantly alter the absorption of capecitabine.
Subjects who have known active hepatitis B (defined as positive hepatitis B surface antigen [HBsAg] with detected hepatitis B virus [HBV] DNA) or known active hepatitis C virus (defined as HCV RNA [qualitative] is detected) infection.
Subjects with genetic conditions such as galactose intolerance, Lapp lactase deficiency, or glucose-galactose malabsorption.
As judged by the Investigator, all other symptoms and associated disease for which the investigator determined that participation in this study is contraindicated (e.g. Infection/inflammation; severe liver dysfunction; bilateral diffuse interstitial lung disease; uncontrolled renal disease; unstable heart and lung disease; hemorrhagic disease; intestinal obstruction; unable to swallow oral pills; social and psychological problems, etc.)
Medical, psychiatric, cognitive, or other conditions that may interfere with the ability of the subject to understand the subject information, provide the informed consent, follow the protocol process, or complete the clinical trial