Solid Tumor, Childhood

This research is being done to find out if an investigational drug, Nivolumab, can be safely administered after a "half-matched" (haplo) bone marrow transplant (BMT), and if the investigational drug will help to prevent or delay relapse or progression of sarcomas. In this study investigators will also be trying to learn more about how the investigational drug changes blood and/or tumors. Participants are eligible for this trial if they have recently undergone a "half-matched" (haplo) bone marrow transplant and have either relapsed or are at high risk to relapse.

This is a study to explore the phenotypic and transcriptional changes of different cellular components in the tumor following the injection of somatic cell therapy drugs. The second objective is to explore phenotypic and transcriptional changes of different cellular components in blood and bone marrow following injection of somatic cell therapy drugs.Then correlate the phenotypic and transcriptional profile of different tumor, blood and bone marrow immune populations with clinical response and/or toxicity. And to finish this study is designed in order to identify a phenotypic, transcriptional and epigenetic profile of intra-tumoral adoptive cells and correlate this profile with clinical response and/or toxicity.

More than half of all pediatric cancer in Korea are solid cancer. For the treatment of solid cancer, multidisciplinary methods such as surgery, chemotherapy, and radiation therapy are applied, and with the development of the treatment method, the treatment performance has improved dramatically, and the 5-year survival rate of more than 80% is currently recorded. Due to the improvement in survival rate, interest in side effects caused by cancer treatment itself is gradually increasing, and efforts to reduce them are increasing. Accordingly, it aims to contribute to improving the quality of life of pediatric solid cancer survivors. by developing a Korean-type early diagnosis and follow-up protocol of ototoxic hearing loss, which commonly occurs in pediatric solid cancer who have undergone chemotherapy.