Canadian clinical trial registry

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Study Description

This is a Phase I, open-label, dose escalation and dose expansion study with BID (suspension) and TID (tablet) oral dose of tazemetostat. Subjects will be screened for eligibility within 14 days of the planned first dose of tazemetostat. A treatment cycle will be 28 days. Response assessment will be evaluated after 8 weeks of treatment and subsequently every 8 weeks while on study.

The study has two parts: Dose Escalation and Dose Expansion.

Dose escalation for subjects with the following relapsed/refractory malignancies:

• Rhabdoid tumors:
• Atypical teratoid rhabdoid tumor (ATRT)
• Malignant rhabdoid tumor (MRT)
• Rhabdoid tumor of kidney (RTK)
• Selected tumors with rhabdoid features
• INI1-negative tumors:
• Epithelioid sarcoma
• Epithelioid malignant peripheral nerve sheath tumor
• Extraskeletal myxoid chondrosarcoma
• Myoepithelial carcinoma
• Renal medullary carcinoma
• Other INI1-negative malignant tumors (e.g., dedifferentiated chordoma) (with Sponsor approval)
• Synovial Sarcoma with a SS18-SSX rearrangement

Dose Expansion at the MTD or the RP2D

• Cohort 1 -(closed to enrollment) ATRT
• Cohort 2 - (closed to enrollment) MRT/RTK/selected tumors with rhabdoid features
• Cohort 3 - INI-negative tumors:
  • Epithelioid sarcoma
  • Epithelioid malignant peripheral nerve sheath tumor
  • Extraskeletal myxoid chondrosarcoma
  • Myoepithelial carcinoma
  • Renal medullary carcinoma
  • Chordoma (poorly differentiated or de-differentiated)
  • Other INI1-negative malignant tumors (e.g., dedifferentiated chordoma) with Sponsor approval
• Cohort 4 -(closed to enrollment) Tumor types eligible for Cohorts 1 through 3 or synovial sarcoma with SS18-SSX rearrangement

Inclusion Criteria

1. Age (at the time of consent/assent): ≥6 months to <18 years

   - Cohort 4 only: ≥10 years to <18 years

2. Performance Status:

   • If <12 years of age: Lanksy Performance Status >50%
   • If ≥12 years of age: Karnofsky Performance Status >50% NOTE: If subject is unable to walk due to paralysis, but is mobile in a wheelchair, subject is considered to be ambulatory for the purpose of assessing their performance status.
3. Has provided signed written informed consent/assent
4. Has a life expectancy of >3 months
5. Has relapsed or refractory disease and no standard treatment options as determined by locally or regionally available standards of care and treating physician's discretion
6. Is ineligible or inappropriate for other treatment regimens known to have effective potential
7. Has a documented local diagnostic pathology of original biopsy confirmed by a Clinical Laboratory Improvement Amendments (CLIA)/College of American Pathologists (CAP) or equivalent laboratory certification
8. Has all prior treatment (i.e., chemotherapy, immunotherapy, radiotherapy) related clinically significant toxicities resolve to ≤ Grade 1 per CTCAE, version 4.03 or are clinically stable and not clinically significant, at time of enrollment

9. Has completed a prior therapy (ies) according to the criteria below:

   • Other investigational study agent (any medicinal product that is not approved in the country of treatment for any indication, adult or pediatric) (At least 30 days or five half-lives, whichever is longer, since last dose prior to the first dose of tazemetostat)
   • Chemotherapy: cytotoxic (At least 14 days since last dose of chemotherapy prior to first dose of tazemetostat)
   • Chemotherapy: nitrosoureas (At least 6 weeks since last dose of nitrosoureas prior to first dose of tazemetostat)
   • Chemotherapy: non-cytotoxic (e.g., small molecule inhibitor) (At least 14 days since last dose of non-cytotoxic chemotherapy prior to first dose of tazemetostat)
   • Monoclonal antibody (ies) (At least 28 days since the last dose of any monoclonal antibody prior to first dose of tazemetostat)
   • Immunotherapy (e.g., tumor vaccine) At least 6 weeks since last dose of immunotherapy agent(s) prior to first dose of tazemetostat)
   • Radiotherapy (RT) (At least 14 days from last local site RT prior to first dose of tazemetostat/At least 21 days from stereotactic radiosurgery prior to first dose of tazemetostat/At least 12 weeks from craniospinal, ≥ 50% radiation of pelvis, or total body irradiation prior to first dose of tazemetostat)
   • Hematopoietic growth factor (At least 14 days from last dose of hematopoietic growth factor prior to first dose of tazemetostat)
   • Hematopoietic cell transplantation (At least 60 days from infusion of hematopoietic cells prior to first dose of tazemetostat)

10. Has adequate hematologic (bone marrow and coagulation factors), renal and hepatic function as defined by criteria below:

    • Hematologic (BM Function):

      • Hemoglobin ≥ 8 g/dL
      • Platelets ≥100,000/mm^3 (≥100 x 10^9/L)
      • ANC ≥1,000/mm^3 (≥1.0 x 10^9/L)

    • Hematologic (Coagulation Factors):

      • INR/ PTd ≤1.5 ULN
      • PTT ≤1.5 ULN
      • Fibrinogen ≥0.75 LLN

    • Renal Function (creatinine clearance or serum creatinine):

      • Calculated creatinine clearance ≥50 mL/min/1.73m^2
      • Serum creatinine 6 months to 1 year: male 0.6 mg/dL (53 µmol/L) female 0.5 mg/dL (44 µmol/L)
      • Serum creatinine 1 to < 2 years: male 0.6 mg/dL (53 µmol/L) female 0.6 mg/dL (53 µmol/L)
      • Serum creatinine 2 to < 6 years: male 0.8 mg/dL (71 µmol/L) female 0.8 mg/dL (71 µmol/L)
      • Serum creatinine 6 to <10 years: male 1 mg/dL (88 µmol/L) female 1 mg/dL (88 µmol/L)
      • Serum creatinine 10 to <13 years: male 1.2 mg/dL (106 µmol/L) female 1.2 mg/dL (106 µmol/L)
      • Serum creatinine 13 to <16 years: male 1.5 mg/dL (133 µmol/L) female 1.4 mg/dL (125 µmol/L)
      • Serum creatinine ≥16 years: male 1.7 mg/dL (150 µmol/L) female 1.4 mg/dL (125 µmol/L)

    • Hepatic Function:

      • Total bilirubin <1.5 x ULN
      • ALT or AST <3 x ULN Eligibility can be determined by either total or conjugated bilirubin

11. For subjects with CNS involvement: Subjects must have deficits that are stable for a minimum of 14 days prior to enrollment, or seizures that are stable, not increasing in frequency or severity and controlled on current anti-seizure medication(s) for a minimum of 7 days prior to enrollment

    NOTE: Subjects with leptomeningeal disease or brian tumors with positive cerebral spinal fluid cytology are eligible for this study. Subjects may receive glucocorticoids (at stable or tapering dose) to control CNS symptoms prior to enrollment; however, subjects should receive a stable or tapering dose for at least 7 days prior to enrollment.

12. Has a shortening fraction of >27% or an ejection fraction of ≥50% by echocardiogram or multi-gated acquisition scan and New York Heart Association Class<2
13. Has a QT interval corrected by Fridericia's formula (QTcF) ≤450 msec
14. Is able to swallow and retain orally administered medication and does not have any uncontrolled gastrointestinal (GI) condition such as nausea, vomiting, or diarrhea, or any clinically significant GI abnormalities that may alter absorption such as malabsorption syndromes, hereditary fructose intolerance, glucose-galactose malabsorption, sucrose-isomaltase insufficiency, or major resection of stomach and/or bowels NOTE: Nasogastric and gastrostomy tube administration of the oral suspension formulation of study drug is permitted.
15. Has sufficient tumor tissue (slides or blocks) available for central confirmatory testing of immunohistochemistry and/or cytogenetics/fluorescence in situ hybridization (FISH) and/or deoxyribonucleic acid mutation analysis (required for study entry but enrollment based on local results)
16. Is willing and able to comply with all aspects of the protocol as judged by Investigator

17. For female subjects of childbearing potential: Subject must:

    • Have a negative beta-human chorionic gonadotropin (β-hCG) pregnancy test at time of Screening and within 72 hours prior to planned first dose of tazemetostat (urine or serum test is acceptable however, positive urine tests must be confirmed with serum testing), and
    • Agree to use effective contraception, as defined in Section 8.6.11 start of Screening until 6 months following the last dose of study treatment and have a male partner who uses a condom, or
    • Practice true abstinence (when this is in line with the preferred and usual lifestyle of the subject, see Section 8.6.11, or
    • Have a male partner who is vasectomized with confirmed azoospermia

18. For male subjects with a female partner of childbearing potential: Subject must:

    • Be vasectomized or
    • Agree to use condoms as defined in Section 8.5.11 from first dose of tazemetostat until 3 months following the last dose of tazemetostat, or
    • Have a female partner who is NOT of childbearing potential

For Dose Escalation Only:

To be eligible for enrollment in dose escalation, a subject must meet ALL of the following criteria in addition to the inclusion criteria listed above for all subjects:

1. Has evaluable disease as defined as lesions that can be accurately measured at least in one dimension by radiographic examination or physical examination and other lesions such as bone lesions, leptomeningeal disease, ascites, hepatosplenomegaly from disease.

2. Has one of the following histologically confirmed tumors: (NOTE: Evidence of diagnostic pathology of original biopsy confirmed by a CLIA/CAP certified laboratory must be available)

   • Rhabdoid tumor:

     • ATRT (Closed to enrollment)
     • MRT
     • RTK
     • Selected tumors with rhabdoid features

   • NI1-negative tumor:

     • Epithelioid sarcoma
     • Epithelioid malignant peripheral nerve sheath tumor
     • Extraskeletal myxoid chondrosarcoma
     • Myoepithelial carcinoma
     • Renal medullary carcinoma
     • Other INI1-negative malignant tumors (e.g., dedifferentiated chordoma) with Sponsor approval
   • Synovial sarcoma with SS18-SSX rearrangement (NOTE: Evidence of diagnostic pathology of original biopsy confirmed by a CLIA/CAP certified laboratory must be available) (Closed to enrollment)
3. For subjects with ATRT, MRT, RTK, or selected tumors with rhabdoid features only: the following test results must be available: Morphology and immunophenotypic panel consistent with rhabdoid tumor and Loss of INI1 or SMARCA4 confirmed by IHC, or Molecular confirmation of tumor bi-allelic INI1 or SMARCA4 loss/mutation when INI1 or SMARCA4 IHC is equivocal or unavailable

4. For subjects with INI1 negative tumor only:

   the following test results must be available: Morphology and immunophenotypic panel consistent with INI1-negative tumors, and Loss of INI1 confirmed by IHC, or Molecular confirmation of tumor bi-allelic INI1 loss/mutation when INI1 IHC is equivocal or unavailable

5. For subjects with synovial sarcoma only:

The following test results must be available:

Morphology consistent with synovial sarcoma, and Cytogenetics or FISH and/or molecular confirmation (e.g., DNA sequencing) of SS18 rearrangement t(X;18)(p11;q11)

For Dose Expansion Only:

Note: To be eligible for enrollment in Dose Expansion, a subject must meet ALL of the following criteria in addition to the inclusion criteria for ALL subjects listed above

1. Has measurable disease

2. Has one of the following histologically confirmed tumors:

   • Cohort 1 - ATRT (Closed to enrollment)
   • Cohort 2 - MRT/RTK/selected tumors with rhabdoid features(Closed to enrollment)
   • Cohort 3 - INI-negative tumors:
     • Epithelioid sarcoma
     • Epithelioid malignant peripheral nerve sheath tumor
     • Extraskeletal myxoid chondrosarcoma(EMC)
     • Myoepithelial carcinoma
     • Renal medullary carcinoma
     • Chordoma (poorly differentiated or de-differentiated)
     • Other INI1-negative malignant tumors (e.g., dedifferentiated chordoma) with Sponsor approval
   • Cohort 4 - Tumor types eligible for Cohorts 1 through 3 or synovial sarcoma with SS18-SSX rearrangement (Closed to enrollment) NOTE: Evidence of diagnostic pathology of original biopsy confirmed by a CLIA/CAP or other Sponsor-approved certified laboratory must be available.

3. For subjects with ATRT/MRT/RTK only - have the following test results available:

   • Morphology and immunophenotypic panel consistent with rhabdoid tumor, and
   • Loss of INI1 or SMARCA4 confirmed by IHC, or
   • Molecular confirmation of tumor bi-allelic INI1 or SMARCA4 loss/mutation when INI1 or SMARCA4 IHC is equivocal or unavailable

4. For subjects with INI1-negative tumors only: The following test results must be available:

   • Morphology and immunophenotypic panel consistent with INI1-negative tumors, and
   • Loss of INI1 confirmed by IHC, or
   • Molecular confirmation of tumor bi-allelic INI1 loss/mutation when INI1 IHC is equivocal or unavailable

5. For subjects with synovial sarcoma with SS18-SSX rearrangement (in Cohort 4 ONLY - Closed to enrollment): The following test results must be available:

   • Morphology consistent with synovial sarcoma, and
   • Cytogenetics or FISH and/or molecular confirmation (e.g., deoxyribonucleic acid [DNA] sequencing) of SS18 rearrangement t(X;18)(p11;q11)
6. For subjects to be enrolled in Cohort 4 (Closed to enrollment): Able to swallow and retain orally administered tablets

Exclusion Criteria

1. Has had prior exposure to tazemetostat or other inhibitor(s) of EZH2
2. Is being actively treated for another concurrent malignancy or is less than five years from completion of treatment for another malignancy
3. Has participated in another interventional clinical study and received investigational drug within 30 days or 5 half-lives, whichever is longer, prior to the planned first dose of tazemetostat
4. Has had major surgery within 2 weeks prior to enrollment NOTE: Minor surgery (e.g., minor biopsy of extracranial site, central venous catheter placement, shunt revision) is permitted within 2 weeks prior to enrollment.

5. Has thrombocytopenia, neutropenia, or anemia of Grade ≥3 (per CTCAE 4.03 criteria) or any prior history of myeloid malignancies, including myelodysplastic syndrome (MDS). Has abnormalities known to be associated with MDS (e.g. del 5q, chr 7 abn) and MPN (e.g. JAK2 V617F) observed in cytogenetic testing and DNA sequencing.

   Note: Bone marrow aspirate/biopsy will be conducted following abnormal peripheral blood smear morphology assessment conducted by central lab at screening. Cytogenetic testing and DNA sequencing will be conducted following an abnormal result of bone marrow aspirate/biopsy.

6. Has a prior history of T-LBL/T-ALL.
7. Has clinically active heart disease including prolonged corrected QTcF (>450 msec)
8. Is currently taking any prohibited medication(s) as described in Section 7.3.
9. Is unwilling to exclude grapefruit juice, Seville oranges and grapefruit from the diet and all foods that contain those fruits from time of enrollment to while on study
10. Has an active infection requiring systemic treatment
11. Is immunocompromised (i.e. congenital immunodeficiencies), including subjects known history of infection with human immunodeficiency virus (HIV)
12. Has known history of chronic infection with hepatitis B virus (hepatitis B surface antigen positive) or hepatitis C virus (detectable HCV RNA)
13. Has had a symptomatic venous thrombosis within the 14 days prior to study enrollment NOTE: Subjects with a history of a deep vein thrombosis 14 days prior to study enrollment who are on anticoagulation therapy with low molecular weight heparin are eligible for this study
14. For subjects with CNS involvement (primary tumor or metastatic disease): Have any active bleeding, or new intratumoral hemorrhage of more than punctate size on Screening MRI obtained within 14 days of starting study drug,or known bleeding diathesis or treatment with anti-platelet or anti-thrombotic agents 15.15. Has known hypersensitivity to any of the components of tazemetostat or other inhibitor(s) of EZH2, or hypersensitivity to Ora-sweet or methylparaben

16. Has an uncontrolled intercurrent illness including, but not limited to, uncontrolled infection, or psychiatric illness/social situations that would limit compliance with study requirements 17. For female subjects of childbearing potential: Is pregnant or nursing For male subjects: Is unwilling to adhere to contraception criteria from time of enrollment in study to at least 30 days after last dose of tazemetostat.

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Centres

Study Description

The purpose of Phase 1b of this study is to:

• Asses the safety, tolerability and activity of carfilzomib, alone and in combination with induction chemotherapy, in children with relapsed or refractory acute lymphoblastic leukemia (ALL).
• Determine the maximum tolerated dose (MTD) and to recommend a phase 2 dose of carfilzomib in combination with induction chemotherapy.

The purpose of Phase 2 of this study is to compare the rate of complete response (CR) of carfilzomib in combination with vincristine, dexamethasone, PEG asparaginase, daunorubicin (VXLD) at the end of induction therapy to an appropriate external control.

Inclusion Criteria

Phase 1b Key Inclusion Criteria:

1. Age 21 years or younger at the time of initial ALL diagnosis and age > 1 year at the time of study treatment initiation.

2. Subjects must have a diagnosis of relapsed or refractory ALL with ≥ 5% blasts in the bone marrow (M2 or M3 disease), with or without extramedullary disease.

   -To be eligible, subjects must have had 1 or more prior therapeutic attempts, defined as:

   • Early first relapse (< 36 months from original diagnosis) after achieving a CR (B-ALL) or first relapse any time following the original diagnosis after achieving a CR (T-ALL)
   • First refractory bone marrow relapse occurring any time after original diagnosis after achieving a CR (ie, ≥1 failed attempt to induce a second remission) OR
   • Relapse after achieving a CR following the first or subsequent relapse (i.e., ≥ 2 relapses) OR
   • Failing to achieve a CR from original diagnosis after at least 1 induction attempt
3. Subjects must have fully recovered from the acute toxic effects of all previous chemotherapy, immunotherapy, or radiotherapy treatment before enrollment.
4. Subjects must have a serum creatinine level that is ≤ 1.5 × institutional upper limit of normal (ULN) according to age. If serum creatinine level is > 1.5 × ULN, the subject must have a calculated creatinine clearance or radioisotope glomerular filtration rate (GFR) ≥ 70 mL/min/1.73 m2.

5. Adequate liver function, defined as both of the following:

   • Total bilirubin ≤ 1.5 × institutional ULN except in the presence of Gilbert Syndrome
   • Alanine aminotransferase (ALT) ≤ 5 × institutional ULN
6. Performance status: Karnofsky or Lansky scores ≥ 50 for subjects > 16 years old or ≤ 16 years old, respectively.

Phase 2 Inclusion Criteria:

1. Subject's legally acceptable representative has provided informed consent when the subject is legally too young to provide informed consent and the subject has provided written assent based on local regulations and/or guidelines prior to any study-specific activities/procedures being initiated.
2. Age ≥ 1 month to < 21 years. Subjects ≥ 18 years must have had their original diagnosis at < 18 years of age.
3. Subjects must be diagnosed with relapsed or refractory relapsed ALL.
4. Subjects must have a documented first remission, ≤ 5% blasts in the bone marrow (M1 bone marrow) and no evidence of extramedullary disease.

5. T-cell ALL with bone marrow relapse (defined as ≥ 5% leukemia blasts in bone marrow) or refractory relapse with or without extramedullary disease.

   OR B-cell ALL bone marrow relapse or refractory relapse (defined as ≥ 5% leukemia blasts in bone marrow) after having received a targeted B-cell immune therapy as treatment for a prior relapse (eg, blinatumomab, inotuzumab or a CAR-T therapy) with or without extramedullary disease. Subjects that receive blinatumomab for treatment of MRD positive disease during first remission do not qualify.

6. Adequate liver function: bilirubin ≤ 1.5 x upper limit of normal (ULN), alanine aminotransferase (ALT) ≤ 5 x ULN.
7. Adequate renal function: serum creatinine ≤ 1.5 x ULN or glomerular filtration rate (GFR) ≥ 70 ml/min/1.73m^2; or for children < 2 years of age ≥ 50 ml/min/1.73m^2.
8. Adequate cardiac function: shortening fraction > 30% or ejection fraction ≥ 50%.
9. Karnofsky (subjects ≥ 16 years of age) or Lansky (subjects 12 months to < 16 years of age) performance status ≥ 50%.
10. Subjects must have fully recovered from the acute toxic effects of all previous chemotherapy, immunotherapy, or radiotherapy treatment before enrollment (for example: recovery from gastrointestinal toxicity may occur more rapidly than less reversible organ toxicities such as sinusoidal obstruction syndrome or non-infectious pneumonitis, for serious prior toxicities recommended discussion with Amgen medical monitor).
11. Life expectancy of ≥ 6 weeks per investigator's judgement at time of screening.

Exclusion Criteria

Phase 1b Key Exclusion Criteria:

1. Known allergy to any of the drugs used in the study (Subjects who have had a previous allergy to PEG-asparaginase and if able, may receive Erwinia asparaginase at the investigator's discretion)
2. Known allergy to Captisol (a cyclodextrin derivative used to solubilize carfilzomib)
3. Left ventricular fractional shortening < 30%
4. History of ≥ Grade 2 pancreatitis
5. Active graft-versus-host disease requiring systemic treatment
6. Positive culture for or other clinical evidence of infection with bacteria or fungus within 14 days of the initiation of study treatment
7. Down Syndrome

8. Prior therapy restrictions:

   • Subjects must have completed therapy with granulocyte-colony stimulating factor (G-CSF) or other myeloid growth factors at least 7 days before study treatment initiation, or at least 14 days before study treatment initiation, if pegylated myeloid growth factors were administered.
   • Subjects must have completed any type of active immunotherapy (e.g., tumor vaccines) at least 42 days before study treatment initiation.
   • Subjects must have received the last dose of a non-monoclonal antibody biologic agent at least 7 days before study treatment initiation.
   • At least 3 antibody half-lives must have elapsed since the last dose of monoclonal antibody (e.g., 66 days for rituximab and 69 days for epratuzumab) before subjects may initiate study treatment.
   • Subjects must not have received other antineoplastic agents with therapeutic intent, excluding hydroxyurea and antimetabolites administered as part of maintenance chemotherapy, within 7 days prior to study treatment initiation.
9. Hepatitis B infection with positive hepatitis B DNA

Phase 2 Exclusion Criteria:

1. Prior treatment with carfilzomib.
2. Prior treatment with a proteasome inhibitor (other than carfilzomib) within < 3 months of enrollment or to which a subject did not respond (response is defined as bone marrow with < 5% blasts).
3. Treatment with a chemotherapy regimen including a vinca alkaloid, steroid, L-asparaginase, and anthracycline combination with or without other chemotherapy agents within 2 months of enrollment (eg VXLD, VPLD, R3).
4. Intolerance, hypersensitivity, or inability to receive any of the chemotherapy components of the VXLD regimen. An exception is allowed for allergy to asparaginase products if Erwinia Asparaginase is unable to be administered, or if PEG-Asparaginase or Erwinia Asparaginase are not available in the country, these subjects may still be included.
5. Autologous HSCT within 6 weeks prior to start of study treatment.
6. Allogeneic HSCT within 3 months prior to start of study treatment.
7. Active GVHD requiring systemic immune suppression.
8. < 30 days from discontinuation of immune suppressive therapy administered for the treatment of acute or chronic GVHD.
9. Isolated extramedullary relapse.
10. Positive bacterial or fungal infection within 14 days of enrollment (except for documented line infection, line has been removed, and blood culture after line removal is negative for 5 days prior to first dose of induction therapy). Antibiotics may be administered for prophylaxis as per institutional standards up to and after enrollment.
11. < 3 antibody half-lives since the last dose of monoclonal antibody (eg, 66 days for rituximab, 69 days for epratuzumab, inotuzumab for 36 days), prior to first dose of investigational product.
12. Cell-based immunotherapy (eg, donor leucocyte infusion, CAR-T cells, tumor vaccines) within 42 days prior to first dose of investigational product. If the Amgen medical monitor agrees, an exception may be granted to the 42-day requirement for subjects with rapidly rising peripheral or bone marrow blast counts.
13. Down's syndrome.
14. Presence of another active cancer.
15. History of grade ≥ 2 pancreatitis within 6 months to screening.
16. Unresolved toxicities from prior anticancer therapy, defined as not having resolved to CTCAE version 4.03 grade 1 or to levels dictated in the eligibility criteria apart from alopecia or toxicities from prior anticancer therapy that are considered irreversible and do not trigger another exclusion criterion (defined as having been present and stable for > 4 weeks).
17. Antitumor therapy (chemotherapy, investigational agents, molecular-targeted therapy) within 7 days of day 1 of induction. Exception: hydroxyurea to control peripheral blood leukemic cell counts is allowed until start of investigational product.
18. Active viral infection, including but not limited to CMV, Hepatitis B infection with positive serum hepatitis surface antigen or hepatitis B DNA, HIV, Hepatitis C with detectable hepatitis C RNA.
19. Currently receiving treatment in another investigational device or product study, or < 14 days since ending treatment on another investigational device or product study.
20. Uncontrolled arrhythmias or screening ECG with corrected QT interval (QTc) of > 470 msec.
21. History or evidence of any other clinically significant disorder, condition or disease (with the exception of those outlined above) that, in the opinion of the investigator or Amgen physician, if consulted, would pose a risk to subject safety or interfere with the study evaluation, procedures or completion.
22. Female subject is pregnant or breastfeeding or planning to become pregnant or breastfeed during treatment and for an additional months after the last dose of any study treatment or for 12 months after last dose of cyclophosphamide if administered during optional consolidation cycle.
23. Female subjects of childbearing potential unwilling to use 1 highly effective method of contraception during treatment and for an additional 12 months after the last dose of any study treatment. Refer to Section 28 for additional contraceptive information.
24. Female subjects of childbearing potential with a positive pregnancy test assessed at Screening by a serum or urine pregnancy test.
25. Male subjects with a female partner of childbearing potential who are unwilling to practice sexual abstinence (refrain from heterosexual intercourse) or use a condom with spermicide during treatment and for an additional 6 months after the last dose of any study treatment, even if they have undergone a successful vasectomy.
26. Male subjects with a pregnant partner who are unwilling to practice abstinence or use a condom with spermicide during treatment, for duration of pregnancy, and for an additional 6 months after the last dose of any study treatment.
27. Male subjects unwilling to abstain from donating semen or sperm during treatment and for an additional 6 months after the last dose of any study treatment.

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Centres

Study Description

This study will compare three treatment regimens containing metaiodobenzylguanidine (MIBG) and compare their effects on tumor response and associated side effects, to determine if one therapy is better than the other for people diagnosed with relapsed or persistent neuroblastoma.

(From NANT website - https://www.nant.org/n2011-01/)

The purpose of this study is to compare three different treatments using the investigational medicine called ¹³¹I-Metaiodobenzylguanidine (MIBG).  MIBG is taken up by neuroblastoma tumor cells, and can be combined together with radioactive iodine ¹³¹ in the laboratory to form the radioactive compound ¹³¹I-MIBG. The ¹³¹I-MIBG compound delivers radiation treatment when it is taken up by neuroblastoma cancer cells throughout the body.   Although testing in laboratories has found that adding other agents can improve the response of neuroblastoma tumor cells to 131 I-MIBG, it is not known if adding other agents to the 131 I-MIBG will increase the number of tumors in patients that will respond to the therapy.  

The three treatment arms on this study are:  1) 131 I-MIBG alone, 2) 131 I-MIBG with Irinotecan and Vincristine, or 3) 131 I-MIBG with Vorinostat.  Patients on all treatment arms will receive autologous (their own) stem cells as part of this therapy.  All three 131 I-MIBG treatment regimens have already been used for the treatment of neuroblastoma and shown tumor responses, and their tolerated doses have been determined.  This study will compare the number of tumor responses seen with each of the three different treatment arms.

Once patients are registered on this study, they will be randomly assigned to one of the three treatment arms.  Random assignment means that the assignment is based on chance. It is like a flip of a coin, and assignment is done by a computer. Neither patients nor their physicians will choose the treatment. All patients will have an equal chance of being assigned to each of the three treatment arms. A total of 105 patients are expected to enroll on this study. There will be 35 patients on each treatment arm.

Inclusion Criteria

• Patients must be > 24 months and < 30 years of age when registered on study.
• Patients must have relapsed neuroblastoma, refractory neuroblastoma that had less than a partial response to standard treatment or persistent neuroblastoma that had at least a partial response to frontline therapy frontline therapy with > 3 residual lesions on end-induction MIBG scan.
• Patients must have evidence of MIBG uptake into tumor at ≥ one site within 4 weeks prior to entry on study and subsequent to any intervening therapy.
• Patients must have adequate heart, kidney, liver and bone marrow function. Patients who have bone marrow disease must still have adequate bone marrow function to enter the study.
• Patients must have a dose of unpurged peripheral blood stem cells is 2.0 x 106 viable CD34+ cells/kg available.

Exclusion Criteria

• They have had previous I-131 MIBG therapy
• They have other medical problems that could get much worse with this treatment.
• They are pregnant or breast feeding.
• They have a history of a venous or arterial thrombosis that was not associated to a central line.
• They have active infections such as hepatitis or fungal infections.
• They have active diarrhea.
• They have had an allogeneic stem cell transplant (received stem cell from someone else)
• They can't cooperate with the special precautions that are needed for this trial.

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Centres

Study Description

Brief Summary:

This phase I/II trial studies the side effects and best dose of nivolumab when given with or without ipilimumab to see how well they work in treating younger patients with solid tumors or sarcomas that have come back (recurrent) or do not respond to treatment (refractory). Immunotherapy with monoclonal antibodies, such as nivolumab and ipilimumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. It is not yet known whether nivolumab works better alone or with ipilimumab in treating patients with recurrent or refractory solid tumors or sarcomas.

Detailed Description:

PRIMARY OBJECTIVES:

I. Determine the tolerability, and define and describe the toxicities of nivolumab administered as a single agent in children with relapsed or refractory solid tumors at the adult recommended dose of 3 mg/kg.

II. Determine if systemic nivolumab exposure in children is similar to the systemic exposure in adults following a 3 mg/kg dose.

III. Determine the maximum tolerated dose (MTD) and/or recommended phase 2 dose (RP2D) and define and describe the toxicities of nivolumab plus ipilimumab administered to children with relapsed or refractory solid tumors.

IV. Assess antitumor effects of nivolumab across selected childhood solid tumors in seven expansion cohorts (Parts B1-B6, B8); neuroblastoma (2 cohorts: measurable disease, metaiodobenzylguanidine [MIBG] positive only non-measurable disease), osteosarcoma, rhabdomyosarcoma, Ewing sarcoma, Hodgkin lymphoma, and non-Hodgkin lymphoma.

V. Assess antitumor effects of nivolumab in combination with ipilimumab across selected childhood solid tumors in two dose combinations (Part D and Part E).

VI. Characterize the pharmacokinetics of nivolumab alone and in combination with ipilimumab, including area under the curve (AUC), concentration maximum (Cmax), concentration minimum (Cmin), using intensive sampling.

VII. Assess immunogenicity of nivolumab alone and in combination with ipilimumab by measuring anti-drug antibody (ADA) levels.

SECONDARY OBJECTIVES:

I. Conduct exploratory studies of the phenotypic and functional effects of nivolumab (alone and in combination with ipilimumab), as well as changes in antibodies to previously vaccinated viruses, in serum samples.

II. Explore whether correlations exist between PD-L1 expression on tumor and antitumor effects of nivolumab (alone and in combination with ipilimumab) in pediatric solid tumors and to conduct exploratory studies of potential tumor associated biomarkers of response in tumor tissue (at least five out of the following markers: NRAS, BRAF, MEK, KIT, PDGF, TP53, RB1 and BRCA1, Akt phosphorylation, IL-17 or PD-L1).

III. Explore presence of tumor infiltrating lymphocytes and their association with antitumor effects of nivolumab (alone and in combination with ipilimumab).

IV. Conduct exploratory studies of the effect of nivolumab (alone or in combination with ipilimumab) on cytokine levels in serum samples.

V. For Part E, determine tumor mutational burden of diagnostic specimens using FoundationOneCDx testing to explore immune- related gene expression or mutation and its association with antitumor response to nivolumab in combination with ipilimumab.

OUTLINE: This is a phase I, dose-escalation study of nivolumab followed by a phase II study.

PART A (COMPLETED): Patients with recurrent or refractory solid tumors receive nivolumab intravenously (IV) over 30 minutes on days 1 and 15. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity.

PART B (COMPLETED): Patients with neuroblastoma, osteosarcoma, rhabdomyosarcoma, Ewing sarcoma, Hodgkin lymphoma, non-Hodgkin lymphoma, or melanoma receive nivolumab as in Part A.

PART C (COMPLETED):

INDUCTION: Patients receive nivolumab IV over 60 minutes and ipilimumab IV over 90 minutes on day 1. Treatment repeats every 21 days for 4 cycles in the absence of disease progression or unacceptable toxicity.

MAINTENANCE: Patients receive nivolumab IV as in Part A. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity.

PART D (COMPLETED):

INDUCTION: Patients with neuroblastoma, osteosarcoma, rhabdomyosarcoma, Ewing sarcoma, Hodgkin lymphoma, non-Hodgkin lymphoma, or melanoma receive nivolumab IV and ipilimumab IV as in Part C. Treatment repeats every 21 days for 4 cycles in the absence of disease progression or unacceptable toxicity.

MAINTENANCE: Patients receive nivolumab IV over 30 minutes on days 1 and 15. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity.

PART E: Patients receive nivolumab IV over 30 minutes on day 1 and ipilimumab IV over 90 minutes on day 1. Treatment repeats every 21 days for up to 4 cycles in the absence of disease progression or unacceptable toxicity. Patients then receive nivolumab IV over 30 minutes on days 1 and 15. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed up at approximately 100 days, every 6 months for up to 24 months, and then annually for up to 60 months.

Inclusion Criteria

• Parts A & C: patients must be >= 12 months and < 18 years of age at the time of study enrollment
• Parts B1-B6, B8, D1-D6, E3, E4: patients must be >= 12 months and =< 30 years of age at the time of study enrollment
• Part B7: patients must be >= 12 months and < 18 years of age at the time of study enrollment

• Patients must have had histologic verification of malignancy at original diagnosis or relapse

  • Parts A & C: patients with recurrent or refractory solid tumors, without central nervous system (CNS) tumors or known CNS metastases, are eligible; note: CNS imaging for patients without a known history of CNS disease is only required if clinically indicated
  • Part B1: patients with relapsed or refractory neuroblastoma
  • Part B2: patients with relapsed or refractory osteosarcoma
  • Part B3: patients with relapsed or refractory rhabdomyosarcoma
  • Part B4: patients with relapsed or refractory Ewing sarcoma or peripheral primitive neuroectodermal tumor (PNET)
  • Part B5: patients with relapsed or refractory Hodgkin lymphoma
  • Part B6: patients with relapsed or refractory non-Hodgkin lymphoma
  • Part B7: patients with unresectable melanoma or metastatic melanoma or relapsed melanoma or refractory melanoma
  • Part B8: Patients with relapsed or refractory neuroblastoma (MIBG evaluable disease without Response Evaluation Criteria in Solid Tumors [RECIST] measurable lesion)
  • Once the dose-escalation portion of Part A is completed, cohorts that are open concurrently for eligible patients (including Parts B and C and potential pharmacokinetic [PK] expansion cohorts) may be selected at the treating physician's discretion pending slot availability; in the event a disease group cohort in Part B is completed after the initial stage of Simon's optimal two-stage design, for selected disease cohorts, a corresponding cohort in the same disease group for select disease types will be open in Part D:
  • Part D1: Patients with relapsed or refractory neuroblastoma
  • Part D2: Patients with relapsed or refractory osteosarcoma
  • Part D3: Patients with relapsed or refractory rhabdomyosarcoma
  • Part D4: Patients with relapsed or refractory Ewing sarcoma or peripheral PNET
  • Part D5: Patients with relapsed or refractory non-Hodgkin lymphoma
  • Part D6: Patients with relapsed or refractory neuroblastoma (MIBG evaluable disease without RECIST measurable lesion)
  • Part E3: Patients with relapsed or refractory rhabdomyosarcoma
  • Part E4: Patients with relapsed or refractory Ewing sarcoma or peripheral PNET
• Parts A & C: patients must have either measurable or evaluable disease
• Parts B, D & E: patients must have measurable disease for Parts B1-B6, D1-D5, E3 and E4; melanoma patients in Part B7 must have either measurable or evaluable disease; neuroblastoma patients in Parts B8 and D6 must be evaluable for MIBG response without evidence of RECIST measurable lesions
• Patient's current disease state must be one for which there is no known curative therapy or therapy proven to prolong survival with an acceptable quality of life
• Karnofsky >= 50% for patients > 16 years of age and Lansky >= 60 for patients =< 16 years of age; patients who are unable to walk because of paralysis, but who are up in a wheelchair, will be considered ambulatory for the purpose of assessing the performance score

• Patients must have fully recovered from the acute toxic effects of all prior anti-cancer therapy and must meet the following minimum duration from prior anti-cancer directed therapy prior to enrollment; if after the required timeframe, the defined eligibility criteria are met, e.g. blood count criteria, the patient is considered to have recovered adequately

  • Cytotoxic chemotherapy or other anti-cancer agents known to be myelosuppressive

    • At least 21 days after the last dose of cytotoxic or myelosuppressive chemotherapy (42 days if prior nitrosourea)
  • Hematopoietic growth factors: At least 14 days after the last dose of a long-acting growth factor (e.g. pegfilgrastim) or 7 days for short-acting growth factor; for agents that have known adverse events occurring beyond 7 days after administration, this period must be extended beyond the time during which adverse events are known to occur; the duration of this interval must be discussed with the study chair
  • Anti-cancer agents not known to be myelosuppressive (e.g. not associated with reduced platelet or absolute neutrophil count [ANC] counts): At least 7 days after the last dose of agent
  • Interleukins, interferons and cytokines (other than hematopoietic growth factors): >= 21 days after the completion of interleukins, interferon or cytokines (other than hematopoietic growth factors)
  • Antibodies: >= 21 days must have elapsed from infusion of last dose of antibody, and toxicity related to prior antibody therapy must be recovered to grade =< 1
  • External beam radiation therapy (XRT)/external beam irradiation including protons: >= 14 days after local XRT; >= 150 days after total body irradiation (TBI), craniospinal XRT or if radiation to >= 50% of the pelvis; >= 42 days if other substantial bone marrow (BM) radiation.
  • Radiopharmaceutical therapy (e.g., radiolabeled antibody, 131I-MIBG): >= 42 days must have elapsed since systemically administered radiopharmaceutical therapy
  • Cellular therapy: >= 42 days must have elapsed since the completion of any type of cellular therapy (e.g. modified T cells, natural killer [NK] cells, dendritic cells, etc.)
  • Patients must not have received prior exposure to nivolumab; for patients enrolled in Parts C, D, and E patients must not have received prior nivolumab or ipilimumab
• For patients with solid tumors without known bone marrow involvement:
• Peripheral absolute neutrophil count (ANC) >= 750/mm^3
• Platelet count >= 75,000/mm^3 (transfusion independent, defined as not receiving platelet transfusions for at least 7 days prior to enrollment)
• Patients with known bone marrow metastatic disease will be eligible for study provided they meet the blood counts above (may receive transfusions provided they are not known to be refractory to red cell or platelet transfusions); these patients will not be evaluable for hematologic toxicity; at least 5 of every cohort of 6 patients with a solid tumor must be evaluable for hematologic toxicity, for Parts A and C; if dose-limiting hematologic toxicity is observed on either Part A or C, all subsequent patients enrolled must be evaluable for hematologic toxicity on that Part

• Creatinine clearance or radioisotope glomerular filtration rate (GFR) >= 70 ml/min/1.73 m^2 or a serum creatinine based on age/gender as follows:

  • Age 1 to < 2 years: maximum serum creatinine (mg/dL) 0.6 for males and females
  • Age 2 to < 6 years: 0.8 for males and females
  • Age 6 to < 10 years: 1 for males and females
  • Age 10 to < 13 years: 1.2 for males and females
  • Age 13 to < 16 years: 1.5 for males and 1.4 for females
  • Age >= 16 years: 1.7 for males and 1.4 for females
• Bilirubin (sum of conjugated + unconjugated) =< 1.5 x upper limit of normal (ULN) for age
• Serum glutamate pyruvate transaminase (SGPT) (alanine aminotransferase [ALT]) =< 135 U/L; for the purpose of this study, the ULN for SGPT is 45 U/L
• No evidence of dyspnea at rest, no exercise intolerance due to pulmonary insufficiency, and a pulse oximetry > 92% while breathing room air
• Serum lipase =< ULN at baseline; patients with glucose intolerance should be on a stable regimen and be monitored
• All patients and/or their parents or legally authorized representatives must sign a written informed consent; assent, when appropriate, will be obtained according to institutional guidelines
• Tissue blocks or slides must be sent for all patients; if tissue blocks or slides are unavailable, the study chair must be notified prior to enrollment

Exclusion Criteria

• Pregnant or breast-feeding women will not be entered on this study due to risks of fetal and teratogenic adverse events as there is yet no available information regarding human fetal or teratogenic toxicities; pregnancy tests must be obtained in girls who are post-menarchal; women of childbearing potential (WOCBP) receiving nivolumab will be instructed to adhere to contraception for a period of 5 months after the last dose of nivolumab; men receiving nivolumab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 7 months after the last dose of nivolumab
• Patients requiring daily systemic corticosteroids are not eligible; patients must not have received systemic corticosteroids within 7 days prior to enrollment; if used to modify immune adverse events related to prior therapy, >= 14 days must have elapsed since last dose of corticosteroid; Note: use of topical or inhaled corticosteroids will not render a patient ineligible
• Patients who are currently receiving another investigational drug are not eligible
• Patients who are currently receiving other anti-cancer agents are not eligible
• Patients with CNS tumors or known CNS metastases will be excluded from this trial; patients with a history of CNS metastases that have been previously treated may enroll if sequential imaging shows not evidence for active disease; patients with extra axial disease (e.g. skull [bone] metastasis that do not invade the dura) may enroll if there is no evidence for CNS edema associated with the lesion
• Patients with a history of any grade autoimmune disorder are not eligible; asymptomatic laboratory abnormalities (e.g. antinuclear antibody [ANA], rheumatoid factor, altered thyroid function studies) will not render a patient ineligible in the absence of a diagnosis of an autoimmune disorder
• Patients with >= grade 2 hypothyroidism due to history of autoimmunity are not eligible; note: hypothyroidism due to previous irradiation on thyroidectomy will not impact eligibility
• Patients who have an uncontrolled infection are not eligible

• Patients with a history of congestive heart failure (CHF) or are at risk because of underlying cardiovascular disease or exposure to cardiotoxic drugs must have adequate cardiac function as clinically indicated:

  • Corrected QT interval (QTC) =< 480 msec
  • Shortening fraction of >= 27% by echocardiogram or ejection fraction of >= 50% by gated radionuclide study
• Patients with known human immunodeficiency virus (HIV) or hepatitis B or C are excluded
• Patients who have received prior solid organ transplantation are not eligible
• Patient who have received allotransplantation are not eligible
• Patients who in the opinion of the investigator may not be able to comply with the safety monitoring requirements of the study are not eligible
• Patients who have received prior anti-PD1 directed therapy (monoclonal antibody [mAb] or small molecule) are not eligible
• Parts C, D, and E: patients who have received prior ipilimumab are not eligible

Publications

Davis KL, Fox E, Merchant MS, Reid JM, Kudgus RA, Liu X, Minard CG, Voss S, Berg SL, Weigel BJ, Mackall CL. Nivolumab in children and young adults with relapsed or refractory solid tumours or lymphoma (ADVL1412): a multicentre, open-label, single-arm, phase 1-2 trial. Lancet Oncol. 2020 Apr;21(4):541-550. doi: 10.1016/S1470-2045(20)30023-1. Epub 2020 Mar 17.

Hattinger CM, Patrizio MP, Magagnoli F, Luppi S, Serra M. An update on emerging drugs in osteosarcoma: towards tailored therapies? Expert Opin Emerg Drugs. 2019 Sep;24(3):153-171. doi: 10.1080/14728214.2019.1654455. Epub 2019 Aug 14. Review.