A Phase 1/2 interventional study of PEEL-224 and Temozolomide in Sarcoma, Sarcoma, Ewing and Desmoplastic Small Round Cell Tumor, sponsored by David S Shulman, MD. Recruiting at 3 sites in United States. Open to participants aged 12 Years to 49 Years. Per ClinicalTrials.gov, last updated 2026-02-19.
Sponsored by David S Shulman, MD · Phase 1/2, Interventional, and Treatment
This research is being done to test a new drug called PEEL-224 in combination with two commercially available drugs, Vincristine and Temozolomide, and to determine how effective this combination of drugs is at treating Ewing Sarcoma (EWS) and Desmoplastic Small Round Cell Tumor (DSRCT), as well as multiple other kinds of sarcomas.
The names of the study drugs and biological agents involved in this study are:
This is an open-label, single-arm, non-randomized, phase I/II trial to test a new drug called PEEL-224 in combination with two commercially available drugs, Vincristine and Temozolomide, and to determine how effective this combination of drugs is at treating Ewing Sarcoma (EWS) and Desmoplastic Small Round Cell Tumor (DSRCT), as well as multiple other kinds of sarcomas. This is the first time that PEEL-224 will be given in combination with Vincristine and Temozolomide to humans.
In Phase 1, the safety and tolerability of PEEL-224 in combination with Vincristine and Temozolomide will be assessed by dose escalation and establishment of a Recommended Phase 2 Dose. In Phase 2 the efficacy of the drug combination will be assessed in three separate cohorts of participants.
The U.S. Food and Drug Administration (FDA) has not approved PEEL-224 as a treatment for Relapsed or Refractory Sarcoma.
The U.S. Food and Drug Administration (FDA) has not approved Vincristine and Temozolomide for Relapsed or Refractory Sarcoma, but it has been approved for other uses.
The research study procedures include screening for eligibility, study treatment in-clinic visits, X-rays, Computerized Tomography (CT) scans, Magnetic Resonance Imaging (MRI) scans, or Positron Emission Tomography (PET) scans, blood tests, urine tests, and electrocardiograms (ECGs).
Participants will receive study treatment for up to 34 cycles (approximately 2 years) and will be followed for up to 1 year after the last participant has received the last dose of treatment.
It is expected that about 63 people will take part in this research study.
PEEL Therapeutics is funding this research study by providing the study drug, PEEL-224.
1,607 studies on the registry are indexed under Sarcoma; 366 are open to participants now.
This study's planned enrollment of 63 is above the median of 40 across 1,255 interventional studies indexed under Sarcoma.
Browse Sarcoma studies →This is the only study on the registry with David S Shulman, MD as lead sponsor.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
-Patients in all cohorts must have disease after standard therapy.
Inclusion Criteria Phase 1 (only) diagnosis requirements:
-Patients must have:
Inclusion Criteria Phase 2 (only) diagnosis requirements
EWS cohort: Patients must have:
Molecular evidence of a FET-ETS family translocation including but not limited to any of the following:
DSRCT cohort: Patients must have:
Other sarcoma cohort: Patients must have:
Participants must meet the following organ and marrow function as defined below: Adequate Bone Marrow Function:
Disease:
count ≥100,000/uL (transfusion independent, defined as not receiving platelet transfusions for at least 7 days prior to enrollment)
--Hematologic Requirements for Subjects with Bone Marrow Involvement by Disease:
Platelets ≥50,000 /uL (may receive platelet transfusions) Not known to be refractory to red cell and/or platelet transfusions.
--Adequate Renal Function: or radioisotope ≥70ml/min/1.73 m2 or A serum creatinine based on age/sex as follows:
Age 13 to \< 16 years, Maximum Serum Creatinine (mg/dL): Male 1.5, Female 1.4
---≥ 16 years, Maximum Serum Creatinine (mg/dL): Male 1.7, Female 1.4
--Adequate Liver Function:
(ALT) ≤110 U/L. For the purpose of this study, the ULN for SGPT is 45 U/L.
Adequate Cardiac Function: \< 480 msec
-Patients must have fully recovered from the acute toxic effects of all prior anti-cancer therapy except organ function as noted above. Patients must meet the following minimum prior to enrollment:
At least 42 days must have elapsed if other substantial BM radiation.
Irinotecan, liposomal irinotecan, and/or temozolomide: Patients may have received prior irinotecan, liposomal irinotecan, and/or temozolomide. NOTE: Patients who have had progressive disease while receiving irinotecan and temozolomide in combination will be excluded from the Phase 2 EWS and DSRCT cohorts only.
-For patients with disease to the CNS enrolling to the phase 1 portion of the trial or the "other sarcoma" cohort, any baseline neurologic deficits (including seizure) must be stable for at least one week prior to study enrollment. Patients with CNS metastatic disease receiving must be on a stable or decreasing dose at time of study entry.
Patients with CNS metastatic disease will not be eligible for the phase 2 EWS and DSRCT cohorts.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Relapsed: the illness came back after treatment had worked. Refractory: it did not respond to treatment, or stopped responding while still on it.
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
A 0–100 scale of how well someone can carry out everyday activities. 100 is no complaints and no signs of illness; 70 is able to look after yourself but not to work or keep up normal activity; 50 is needing considerable help and frequent medical care.
Studies often ask for 60 or 70 and above. Your doctor gives the score.
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
A planned gap after a treatment, so that its effects can lessen before the study treatment or a study assessment. Ask the study team and the doctor who prescribed it before changing any medicine.
Stem cell (bone marrow) transplants. Allogeneic uses cells from a donor; autologous uses your own cells, collected earlier and given back.
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
CYP3A is a group of enzymes, mainly CYP3A4, in the liver and gut that break down many medicines. Some medicines, supplements and foods (grapefruit, St John’s wort) slow them down or speed them up, which changes how much of a study drug stays in the body.
Studies list them so they can be avoided or switched; bring a list of everything you take, including supplements.
Relapsed and refractory
Relapsed: the illness came back after treatment had worked. Refractory: it did not respond to treatment, or stopped responding while still on it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Measurable disease
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
RECIST
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Karnofsky performance status (KPS)
A 0–100 scale of how well someone can carry out everyday activities. 100 is no complaints and no signs of illness; 70 is able to look after yourself but not to work or keep up normal activity; 50 is needing considerable help and frequent medical care.
Studies often ask for 60 or 70 and above. Your doctor gives the score.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Absolute neutrophil count (ANC)
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Creatinine clearance (CrCl)
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bilirubin
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
QT and QTc
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Washout period
A planned gap after a treatment, so that its effects can lessen before the study treatment or a study assessment. Ask the study team and the doctor who prescribed it before changing any medicine.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Allogeneic and autologous transplant
Stem cell (bone marrow) transplants. Allogeneic uses cells from a donor; autologous uses your own cells, collected earlier and given back.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Biopsy and archival tissue
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CYP3A (CYP3A4) inhibitors and inducers
CYP3A is a group of enzymes, mainly CYP3A4, in the liver and gut that break down many medicines. Some medicines, supplements and foods (grapefruit, St John’s wort) slow them down or speed them up, which changes how much of a study drug stays in the body.
Studies list them so they can be avoided or switched; bring a list of everything you take, including supplements.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Up to 15 participants will be enrolled using a Bayesian design, the Continual Reassessment Method (CRM), to determine the maximum tolerated dose of PEEL-224 and starting at Dose Level 0. Transition to a lower dose level will be determined by types of dose-limiting toxicities observed per the protocol. * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Transition to a lower dose level will be determined by types of dose-limiting toxicities observed per the protocol, otherwise establishment of the MTD/RP2D will be according to the CRM model. * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Transition to a lower dose level will be determined by types of dose-limiting toxicities observed per the protocol, otherwise establishment of the MTD/RP2D will be according to the CRM model. * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Establishment of the MTD/RP2D will be according to the CRM design. * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Escalation to Dose Level 2 or establishment of the MTD/RP2D will be determined by the CRM design. * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Establishment of the MTD/RP2D will be determined by the CRM design. * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Administration of PEEL-224 will be at the RP2D, and safety monitoring rules will be applied for the occurrence of dose-limiting toxicities. 15 participants will be enrolled and will complete: * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Administration of PEEL-224 will be at the RP2D, and safety monitoring rules will be applied for the occurrence of dose-limiting toxicities. 15 participants will be enrolled and will complete: * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Administration of PEEL-224 will be at the RP2D, and safety monitoring rules will be applied for the occurrence of dose-limiting toxicities. 15 participants will be enrolled and will complete: * Baseline visit with assessments and imaging * Cycle 1 (21 day cycle): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Day 10: Myeloid growth factor (Pegfilgrastim or Filgrastim) administration 1x daily * Cycle 2 through End of Treatment (21 day cycles): * Days 1 through 5: Predetermined dose of Temozolomide 1x daily * Days 1 and 8: Predetermined dose of PEEL-224 1x daily and predetermined dose of Vincristine 1x daily * Imaging every 2 cycles until Cycle 6 and then every 3 cycles * End of study visit
Drug: PEEL-224 · Drug: Temozolomide · Drug: Vincristine · Biological: Pegfilgrastim · Biological: Filgrastim
Topoisomerase 1 inhibitor, 200mg amber vial, via intravenous (into the vein) infusion per protocol.
Alkylating agent, 5, 20, 100, 140, 180, or 250 mg capsule, taken orally per standard of care.
Also known as: Temodar, Temodal
Vinca alkaloid, 1 or 2mL vials, via intravenous (into the vein) infusion per institutional policy.
Myeloid growth factor administered per institutional standards.
Also known as: Neupogen
Myeloid growth factor administered per institutional standards.
Also known as: Nivestym, Granix, Zarxio, Filgrastim-Aafi, Filgrastim-Sndz, Tbo-Filgrastim,, RHG-CSF
Maximum Tolerated Dose (MTD) (Phase 1)
The MTD is determined by a Continual Reassessment Method (CRM) design and defined as the dose level with the posterior probability of dose-limiting toxicity (DLT) closest to the target toxicity rate of 0.3 with a maximum sample size of 15. The DLT observation period is up to 35 days long, beginning at the first dose of any of the three drugs in cycle 1 and ending at the occurrence of a DLT.
Time frame: Up to 35 days
Number of Participants with Dose-Limiting Toxicities (Phase 1)
Any ≥ Grade 2 CTCAE v5 adverse events that are possibly, probably, or definitely attributable to the combination of Vincristine, PEEL-224, and Temozolomide and within the first 35 days, beginning at the first dose of any of the three drugs in cycle 1 and ending at the occurrence of DLT or at the start of treatment in cycle 2 (whichever occurs first). To be evaluable for dose-limiting toxicity, a participant must also receive at least 75% of prescribed agents in cycle 1 and be followed for at least 35 days during cycle 1 or to the start of cycle 2 (whichever occurs first).
Time frame: Up to 35 days
Number of Participants with DLTs (Phase 2)
A safety monitoring rule will be applied to Phase 2 of the study for the overall participant cohort. The DLT observation period is up to 35 days long, beginning at the first dose of any of the three drugs in cycle 1 and ending at the occurrence of DLT or at the start of treatment in cycle 2 (whichever occurs first).
Time frame: Up to 35 days
Objective Response Rate EWS Cohort (Phase 2)
ORR is defined as the percentage of participants achieving complete response (CR) or partial response (PR) on treatment based on RECIST 1.1 criteria. Evaluable participants must have measurable disease at screening, be treated at RP2D dose, have received at least one dose of study drug, and either have evidence of clinical progression or have had at least one follow-up disease evaluation of their RECIST measurable disease after initiation of protocol therapy. The proportion of responders is calculated as the (number of responders) / (number of evaluable participants).
Time frame: Up to 5 years (based on accrual duration of 2 years)
Objective Response Rate DSRCT Cohort (Phase 2)
ORR is defined as the percentage of participants achieving complete response (CR) or partial response (PR) on treatment based on RECIST 1.1 criteria. Evaluable participants must have measurable disease at screening, be treated at RP2D dose, have received at least one dose of study drug, and either have evidence of clinical progression or have had at least one follow-up disease evaluation of their RECIST measurable disease after initiation of protocol therapy. The proportion of responders is calculated as the (number of responders) / (number of evaluable participants).
Time frame: Up to 5 years (based on accrual duration of 2 years)
Objective Response Rate Other Sarcoma Cohort
ORR is defined as the percentage of participants achieving complete response (CR) or partial response (PR) on treatment based on RECIST 1.1 criteria. Evaluable participants must have measurable disease at screening, be treated at RP2D dose, have received at least one dose of study drug, and either have evidence of clinical progression or have had at least one follow-up disease evaluation of their RECIST measurable disease after initiation of protocol therapy. The proportion of responders is calculated as the (number of responders) / (number of evaluable participants).
Time frame: Up to 5 years (based on accrual duration of 2 years)
Median Progression-Free Survival (PFS) Other Sarcoma Cohort
Progression-Free Survival (PFS) based on the Kaplan-Meier method is defined as the time from registration to the earlier of progression or death due to any cause. Participants alive without disease progression are censored at date of last disease evaluation.
Time frame: Approximately 2 years
Overall Survival (OS) Other Sarcoma Cohort
Overall Survival (OS) based on the Kaplan-Meier method is defined as the time from registration to death due to any cause, or censored at date last known alive.
Time frame: Up to 5 years (based on accrual duration of 2 years)
Median PFS EWS Cohort
PFS based on the Kaplan-Meier method is defined as the time from registration to the earlier of progression or death due to any cause. Participants alive without disease progression are censored at date of last disease evaluation.
Time frame: Approximately 2 years
OS EWS Cohort
OS based on the Kaplan-Meier method is defined as the time from registration to death due to any cause, or censored at date last known alive.
Time frame: Up to 5 years (based on accrual duration of 2 years)
Median PFS DSRCT Cohort
PFS based on the Kaplan-Meier method is defined as the time from registration to the earlier of progression or death due to any cause. Participants alive without disease progression are censored at date of last disease evaluation.
Time frame: Approximately 2 years
OS DSRCT Cohort
OS based on the Kaplan-Meier method is defined as the time from registration to death due to any cause, or censored at date last known alive.
Time frame: Up to 5 years (based on accrual duration of 2 years)
Peak Plasma Concentration (Cmax) of PEEL-224
Cmax will be estimated within the cohort of evaluable participants 12 years and older who received PEEL-224 given on a 2-week on and 1-week off schedule.
Time frame: Days 1, 2, 3, and 8 of Cycle 1 (21 days per cycle)
Area Under the Plasma Concentration Versus Time Curve (AUC) of PEEL-224
AUC will be estimated within the cohort of evaluable participants 12 years and older who received PEEL-224 given on a 2-week on and 1-week off schedule.
Time frame: Days 1, 2, 3, and 8 of Cycle 1 (21 days per cycle)
Peak Time (Tmax) of PEEL-224
Tmax will be estimated within the cohort of evaluable participants 12 years and older who received PEEL-224 given on a 2-week on and 1-week off schedule.
Time frame: Days 1, 2, 3, and 8 of Cycle 1 (21 days per cycle)
Circulating Tumor DNA (ctDNA) Burden EWS Cohort at Baseline
ctDNA burden is the amount of circulating tumor DNA (ctDNA) present in the bloodstream, reflecting the extent of tumor-derived DNA shed into circulation. A next generation sequencing or PCR-based approach will be used to detect ctDNA.
Time frame: Baseline
ctDNA Burden EWS Cohort at Day 8
ctDNA burden is the amount of circulating tumor DNA (ctDNA) present in the bloodstream, reflecting the extent of tumor-derived DNA shed into circulation. A next generation sequencing or PCR-based approach will be used to detect ctDNA.
Time frame: Day 8
ctDNA Burden DSRCT Cohort at Baseline
ctDNA burden is the amount of circulating tumor DNA (ctDNA) present in the bloodstream, reflecting the extent of tumor-derived DNA shed into circulation. A next generation sequencing or PCR-based approach will be used to detect ctDNA.
Time frame: Baseline
ctDNA Burden DSRCT Cohort at Day 8
ctDNA burden is the amount of circulating tumor DNA (ctDNA) present in the bloodstream, reflecting the extent of tumor-derived DNA shed into circulation. A next generation sequencing or PCR-based approach will be used to detect ctDNA.
Time frame: Day 8
≥ Grade 2 Treatment-Related Toxicity Rate (Phase 1)
The percentage of participants that experience a maximum grade 2-5 treatment-related adverse event based on the Common Toxicity Criteria for Adverse events Version 5.0 (CTCAEv5) as reported on case report forms. From start of protocol therapy until 30 days after last dose of temozolomide, vincristine or PEEL-224, which ever occurs last.
Time frame: Approximately 2 years
≥ Grade 2 Treatment-Related Toxicity Rate (Phase 2)
The percentage of participants who experience ≥ Grade 2 treatment-related adverse event based on the Common Toxicity Criteria for Adverse events Version 5.0 (CTCAEv5) as reported on case report forms. From start of protocol therapy until 30 days after last dose of temozolomide, vincristine or PEEL-224, which ever occurs last.
Time frame: Approximately 2 years
Median Duration of Overall Response (DOR) (Phase 2)
The duration of overall response is measured from the time measurement criteria are met for CR or PR (whichever is first recorded) until the first date that recurrent or progressive disease is objectively documented (taking as reference for progressive disease the smallest measurements recorded since the treatment started, or death due to any cause. Participants without events reported are censored at the last disease evaluation)
Time frame: Approximately 2 years
Median Duration of Complete Response (CR) (Phase 2)
The duration of CR is measured from the time measurement criteria are first met for CR until the first date that progressive disease is objectively documented, or death due to any cause. Participants without events reported are censored at the last disease evaluation.
Time frame: Approximately 2 years
Median Duration of Stable Disease (Phase 2)
Stable disease is measured from the start of the treatment until the criteria for progression are met, taking as reference the smallest measurements recorded since the treatment started, including the baseline measurements.
Time frame: Approximately 2 years
Plan to share: Yes — The Dana-Farber / Harvard Cancer Center encourages and supports the responsible and ethical sharing of data from clinical trials. De-identified participant data from the final research dataset used in the published manuscript may only be shared under the terms of a Data Use Agreement. Requests may be directed to: [contact information for Sponsor Investigator or designee]. The protocol and statistical analysis plan will be made available on Clinicaltrials.gov only as required by federal regulation or as a condition of awards and agreements supporting the research.
Supporting information: Study protocol, Statistical analysis plan
Time frame: Data can be shared no earlier than 1 year following the date of publication
Access criteria: Contact the Belfer Office for Dana-Farber Innovations (BODFI) at innovation@dfci.harvard.edu
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Started Jan 2025 (actual). Primary completion is estimated for Nov 2028, 45 months after the start.
Of 57 non-industry phase 1/2 interventional studies under Sarcoma, half reached primary completion within 71 months of starting (the median), counting those still running; a quarter within 51 and three quarters within 117. This study's planned 45 months is below that.
Counting every sponsor, half of 101 studies reached it within 62 months; a quarter within 45 and three quarters within 106.
How these figures are worked out, and which studies are left out of them.
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Studies of the drug tested here: Pegylated TOP1 Inhibitor PEEL-224