A Phase 1 interventional study of Definitive Surgical Resection and Nanoplexed Poly I:C BO-112 in Leiomyosarcoma, Malignant Peripheral Nerve Sheath Tumor and Myxofibrosarcoma, sponsored by Jonsson Comprehensive Cancer Center. Active, not recruiting at 1 site in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-03-10.
Sponsored by Jonsson Comprehensive Cancer Center · Phase 1, Interventional, and Treatment
This phase I trial studies the side effects of BO-112 when given together with nivolumab before surgery in treating patients with soft tissue sarcoma that can be removed by surgery (resectable). Immunotherapy with monoclonal antibodies, such as nivolumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Immunotherapy with BO-112, may induce changes in body's immune system and may interfere with the ability of tumor cells to grow and spread. Giving nivolumab and BO-112 before surgery may work better in treating patients with soft tissue sarcoma compared to nivolumab alone.
PRIMARY OBJECTIVE:
I. To determine the safety and tolerability of integrating BO-112, and BO-112 with nivolumab in soft tissue sarcoma patients undergoing preoperative radiotherapy.
SECONDARY OBJECTIVES:
I. Determine the change in T cell infiltration at surgical resection from baseline as measured by immunohistochemistry.
II. Assess treatment effect (necrosis score) of BO-112 and BO-112 in combination with nivolumab in soft tissue sarcoma patients receiving preoperative hypofractionated radiotherapy, compared to patients treated on a recently completed phase 2 study of preoperative hypofractionated radiotherapy alone.
III. Evaluate the 2-year rate of local and distant metastasis of BO-112 and BO-112 in combination with nivolumab in patients with localized resectable soft tissue sarcoma receiving preoperative hypofractionated radiotherapy, as compared to historical patients receiving preoperative radiotherapy alone.
EXPLORATORY OBJECTIVES:
I. Evaluate the dynamics of the intratumoral T cell phenotype. II. Assess the capacity to grow ex vivo tumor infiltrating lymphocytes from patients treated with BO-112 and BO-112 in combination with nivolumab.
III. Analyze changes in T-cell receptor (TCR) repertoire in tumor infiltrating lymphocytes and peripheral blood mononuclear cells (PBMCs) between baseline, post-treatment, and ex vivo cultured tumor infiltrating lymphocyte (TIL) samples.
IV. For patients with disease burden outside of the resected lesion, assess imaging response to treatment using Response Evaluation Criteria in Solid Tumors (RECIST) criteria.
OUTLINE:
Patients receive BO-112 intratumorally on days 8 and 15 or 1, 8, and 15 and nivolumab intravenously (IV) over 30-60 minutes on day 8 in the absence of disease progression or unacceptable toxicity. Patients also undergo standard of care radiation therapy on days 8-12 for a total of 5 fractions. Patients then undergo standard of care definitive surgical resection on day 26 to 50.
After completion of study treatment, patients are followed up at 2 weeks, 3 months, and between 6-12, 12-18, and 18-24 months.
Biopsy proven soft tissue sarcoma of the extremity, trunk or retroperitoneum including undifferentiated pleomorphic sarcoma, myxofibrosarcoma, leiomyosarcoma, dedifferentiated liposarcoma, synovial sarcoma, malignant peripheral nerve sheath tumor, or pleomorphic rhabdomyosarcoma. Undifferentiated pleomorphic sarcoma encompasses any of the following histologies:
Highly effective methods of contraception have a failure rate of \< 1% when used consistently and correctly. WOCBP and female partners of male subjects, who are WOCBP, are expected to use one of the highly effective methods of contraception listed below. Male subjects must inform their female partners who are WOCBP of the contraceptive requirements of the protocol and are expected to adhere to using contraception with their partner. Contraception methods are as follows:
Vasectomized partner with documented azoospermia 90 days after procedure
Complete abstinence
The reliability of sexual abstinence needs to be evaluated in relation to the duration of the clinical trial and the preferred and usual lifestyle of the subject
Male or female condom with or without spermicide
Progestogen-only oral hormonal contraception, where inhibition of ovulation is not the primary mode of action
Exclusion Criteria:
Active or prior documented autoimmune disease within the past 3 years
Prisoners or subjects who are involuntarily incarcerated
Patients receive BO-112 intratumorally on days 8 and 15 or 1, 8, and 15 and nivolumab IV over 30-60 minutes on day 8 in the absence of disease progression or unacceptable toxicity. Patients also undergo standard of care radiation therapy on days 8-12 for a total of 5 fractions. Patients then undergo standard of care definitive surgical resection on day 26 to 50.
Procedure: Definitive Surgical Resection · Biological: Nanoplexed Poly I:C BO-112 · Biological: Nivolumab · Radiation: Radiation Therapy
Undergo definitive surgical resection
Given intratumorally
Also known as: BO 112, BO-112, BO112, Nanoplexed Poly IC BO-112, Nanoplexed Polyinosinic:Polycytidylic Acid BO-112
Given IV
Also known as: BMS-936558, CMAB819, MDX-1106, NIVO, Nivolumab Biosimilar CMAB819, ONO-4538, Opdivo
Undergo radiation therapy
Also known as: Cancer Radiotherapy, ENERGY_TYPE, Irradiate, Irradiated, Irradiation, Radiation, Radiation Therapy, NOS, Radiotherapeutics, Radiotherapy, RT, Therapy, Radiation
Incidence of adverse events (AEs)
AEs will be tabulated by type, severity, and the proportion of subject experiencing the event.
Time frame: study enrollment through 100 days after the last dose of study drug
Immune-oncologic impact of the BO-112 or the combined regimen of nivolumab and BO-112
Statistical analysis of immune-oncologic changes will be performed by comparing results from surgical specimens with baseline biopsy specimens. For immunohistochemical parameters, the percentage of CD4+ (cluster of differentiation 4) or CD8+((cluster of differentiation 8) cells will be compared between biopsy and surgical specimens using a paired two-tailed ratio T-test comparing means.
Time frame: from the date of study drug initiation until 50 days after study drug initiation (or the date of surgery, whichever comes first)
Pathologic treatment effect
Will be compared to historical samples receiving preoperative radiotherapy alone. Will use a two-sample paired T-test comparing means.
Time frame: At time of surgery
This study is active, not recruiting, as verified in Mar 2026. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Jonsson Comprehensive Cancer Center