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NCT Number: NCT05312411

A Phase I Feasibility And Safety Study of Fluorescein-Specific (FITC-E2) CAR T Cells In Combination With Parenterally Administered Folate-Fluorescein (UB-TT170) For Osteogenic Sarcoma

The purpose of this study is to see if a new treatment could help patients who have osteosarcoma that does not go away with treatment (is refractory) or comes back after treatment (is recurrent).This study is testing a combination of study therapies, UB-TT170 and genetically modified chimeric antigen receptor T lymphocyte (CAR T) cells, which work together in a way that is different from chemotherapy.

In this study, researchers will take some of your blood and remove the T cells in a process called "apheresis". Then the T cells are taken to a lab and changed to CAR T cells that recognize the flags from UB-TT170. Once researchers think they have grown enough CAR T cells, called antiFL(FITC-E2) CAR T cells, to fight your cancer, you may get some chemotherapy to make room in your body for the new cells and then have those cells put back in your body.

A few days after the you get your CAR T cell infusion you will start to get infusions of UB-TT170, with the dose slowly increasing for the first few infusions until you have reached a maximum dose that you will get on a regular schedule. The UB-TT170 will attach to your tumor cells and flag them so that they attract the CAR T cells. When the CAR T cells see the labeled tumor cells they can kill the tumor cells.

The active part of the study lasts about 8 months, and if you get the CAR T cell infusion you will be in long-term follow-up for 15 years.

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This study is active but is not currently recruiting participants.

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Key information

Conditions

Osteosarcoma Bone Diseases Bone Neoplasms Musculoskeletal Diseases Neoplasms Neoplasms by Histologic Type Neoplasms by Site Neoplasms, Bone Tissue Neoplasms, Connective Tissue Neoplasms, Connective and Soft Tissue Sarcoma

Age range

15 year–30 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1

Primary location

Seattle Children's Hospital

Seattle, Washington, 98105, United States

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Refractory or recurrent/progressive osteosarcoma that has failed first line therapy for Osteosarcoma per NCCN or upfront Children's Oncology Group clinical trial and is not amenable to surgical resection (must meet one of the following):
  • New site of measurable disease by radiographic imaging or histologic confirmation
  • New site of evaluable disease by radiographic imaging (including FDG-PET) or histologic confirmation
  • Greater than 20% increase in at least one tumor dimension documented by CT/MRI, AND a maximum absolute increase of 5 mm in longest dimension of existing lesion(s) (previously irradiated lesions may be included)
  • Persistent measurable disease or FDG-PET avid bone metastasis that has failed to achieve complete remission to upfront conventional therapy (surgery, radiotherapy and/or chemotherapy)
  • Able to tolerate apheresis, including placement of temporary apheresis catheter, if necessary, or already has an apheresis product available for use in manufacturing
  • Life expectancy ≥ 8 weeks
  • Lansky or Karnofsky score ≥ 50
  • Anti-cancer agents, radiotherapy, cytoxic chemotherapy, biologic therapy, anti-tumor antibody therapy, genetically modified cell therapy, and, if no apheresis product available, corticosteroid therapy (excluding physiologic replacement), discontinued within protocol specified wash-out period
  • Adequate hematologic, renal, hepatic, cardiac, and respiratory function.
  • Negative HIV, hepatitis B and C test within 3 months
  • If of child-bearing or fathering potential, willing to use highly effective contraception through 12 months following final stud drug infusion

Exclusion criteria

  • Active malignancy other than primary malignant solid tumor diagnosis (CNS intracranial metastases are allowed)
  • Ongoing, symptomatic CNS pathology requiring medical intervention
  • Receiving external beam radiotherapy
  • Presence of active, severe infection
  • Primary immunodeficiency syndrome
  • Pregnant or breast feeding
  • Unwilling to provide consent/assent for study participation, including 15 year follow up
  • Presence of any condition that, in the opinion of the investigator, would prohibit the subject from undergoing treatment under this protocol.

Treatment and study plan

SCRI-E2CAR_EGFRtv1

Biological

Autologous CD4+ and CD8+ T cells that have been genetically modified to express antiFL(FITC-E2)

UB_TT170

Drug

Bispecific small molecule adapter formulated with phosphate buffered saline

Primary outcomes

  1. Adverse events associated with ex-vivo expanded autologous T cells genetically modified to express an antiFL(FITC-E2) CAR administered with UB-TT170 will be assessed

    Time frame: 30 days

    The type, frequency, severity, and duration of adverse events will be summarized

Secondary outcomes

  1. Ability to manufacture antiFL(FITC-E2) CAR cells

    Time frame: 28 Days

    The number of successfully manufactured antiFL(FITC-E2) CAR products will be assessed

  2. Evaluate the pharmacokinetics of UB-TT170 in combination with the anti-FL(FITC-E2) CAR T cells

    Time frame: 25 days

    Pharmacokinetics of UB-TT170 in combination with the anti-FL(FITC-E2) CAR T cells

Sponsors and collaborators

Lead sponsor

Seattle Children's Hospital

Other

Collaborators

  • Umoja Biopharma

Registry information

Official study title

A Phase I Feasibility And Safety Study of Fluorescein-Specific (FITC-Ew) CAR T Cells In Combination With Parenterally Administered Folate-Fluorescein (UB-TT170) For Osteogenic Sarcoma

Important dates

Study start
2022
Primary completion
2025
Study completion
2040
First posted
Apr 5, 2022
Registry last updated
Nov 20, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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