Larotrectinib in Treating Patients With Previously Untreated TRK Fusion Solid Tumors and TRK Fusion Relapsed Acute Leukemia

Larotrectinib (LOXO-101, NSC# 788607) for Previously Untreated TRK Fusion Pediatric Solid Tumors and TRK Fusion Relapsed Pediatric Acute Leukemias

This phase II trial studies the side effects and how well larotrectinib works in treating patients with previously untreated TRK fusion solid tumors and TRK fusion acute leukemia that has come back. Larotrectinib may stop the growth of cancer cells with TRK fusions by blocking the TRK enzymes needed for cell growth.

Study Overview

• Status: Active, not recruiting
• Conditions: Central Nervous System Neoplasm; Solid Neoplasm; Recurrent Acute Leukemia; Refractory Acute Leukemia; Infantile Fibrosarcoma
• Intervention / Treatment: Drug: Larotrectinib Sulfate

Detailed Description

PRIMARY OBJECTIVE:

I. To determine the objective response rate (ORR) of children with infantile fibrosarcoma (IFS) treated with neoadjuvant larotrectinib prior to local control.

SECONDARY OBJECTIVES:

I. To determine event-free survival (EFS), overall survival (OS), and duration of response (DoR) of children with IFS treated with neoadjuvant larotrectinib prior to local control.

II. To determine the ORR, EFS, OS, and DoR of children with newly diagnosed TRK fusion solid tumors other than IFS treated with neoadjuvant larotrectinib prior to local control.

III. To describe the toxicity of larotrectinib in children with solid tumors and acute leukemia.

IV. To determine the percentage of patients with TRK fusion solid tumors with detectable circulating tumor deoxyribonucleic acid (DNA) at baseline and after 2 weeks, 4 weeks, 24 weeks of treatment, at the time of discontinuation of larotrectinib therapy, and at progression.

EXPLORATORY OBJECTIVES:

I. To determine the EFS, OS, and DoR of children with TRK fusion solid tumors other than IFS treated with adjuvant larotrectinib following upfront surgery with positive margins after neoadjuvant larotrectinib.

II. To determine the EFS, OS, and DoR of children with TRK fusion solid tumors who experience a complete response to larotrectinib and subsequently discontinue larotrectinib therapy.

III. To determine the remission induction rate for patients with recurrent/refractory TRK fusion leukemia when treated with larotrectinib.

IV. To evaluate the surgical morbidity and extent of resection of initially unresectable tumors in patients with TRK fusion solid tumors who undergo surgical resection following neoadjuvant larotrectinib.

V. To evaluate mechanisms of response and resistance to larotrectinib in children with TRK fusion cancers.

VI. To evaluate the morphologic features of TRK fusion solid tumors at time of initial biopsy to further define criteria for pathologic diagnosis of these tumors.

VII. To evaluate immunohistochemistry for pan-TRK as a screening method for TRK fusion tumors and in resection specimens following neoadjuvant treatment with larotrectinib.

VIII. To evaluate the histologic response to larotrectinib in resection specimens following neoadjuvant treatment.

IX. To evaluate circulating tumor DNA for the detection of the emergence of resistance mutations and recurrence in patients with TRK fusion solid tumors treated with larotrectinib.

X. To evaluate the ratio of cerebrospinal fluid (CSF) to concurrent plasma concentrations of larotrectinib in patients with leukemia.

XI. To evaluate the change in neurocognitive/behavioral functioning over time between baseline and 2 years post-diagnosis of patients treated on this protocol using parent-reported adaptive functioning (Adaptive Behavior Assessment System [ABAS]-III General Adaptive Composite), executive function (Behavior Rating Inventory of Executive Function Scales-Preschool Version [BRIEF-P] or BRIEF-2 Global Executive Composite Score), psychosocial functioning (Behavior Assessment System for Children [BASC]-3 Internalizing, Externalizing and Behavioral Symptoms Indices) and quality of life (Pediatric Quality of Life Inventory [PedsQL] Total score).

OUTLINE:

Patients receive larotrectinib orally (PO) or by nasogastric (NG) or gastric tube (G-tube) twice daily (BID) on days 1-28. Treatment repeats every 28 days for up to 26 cycles in the absence of disease progression or unacceptable toxicity. Patients whose tumors shrink sufficiently while taking larotrectinib may undergo surgical resection of their tumor while on study.

After completion of study treatment, patients are followed up at 3, 6, 12, 18, 24, 30, 36, and 48 months and annually thereafter for up to 5 years from the date of study entry.

• Study Type: Interventional
• Enrollment (Estimated): 70
• Phase: Phase 2

Contacts and Locations

Study Locations

• Canada
  • Nova Scotia
    • Halifax, Nova Scotia, Canada, B3K 6R8
      • IWK Health Centre
  • Quebec
    • Montreal, Quebec, Canada, H3T 1C5
      • Centre Hospitalier Universitaire Sainte-Justine
• United States
  • Alabama
    • Birmingham, Alabama, United States, 35233
      • Children's Hospital of Alabama
  • Arkansas
    • Little Rock, Arkansas, United States, 72202-3591
      • Arkansas Children's Hospital
  • California
    • Downey, California, United States, 90242
      • Kaiser Permanente Downey Medical Center
    • Los Angeles, California, United States, 90027
      • Children's Hospital Los Angeles
    • Oakland, California, United States, 94611
      • Kaiser Permanente-Oakland
    • Orange, California, United States, 92868
      • Children's Hospital of Orange County
    • San Francisco, California, United States, 94158
      • UCSF Medical Center-Mission Bay
  • Colorado
    • Aurora, Colorado, United States, 80045
      • Children's Hospital Colorado
    • Denver, Colorado, United States, 80218
      • Rocky Mountain Hospital for Children-Presbyterian Saint Luke's Medical Center
  • Connecticut
    • New Haven, Connecticut, United States, 06520
      • Yale University
  • Delaware
    • Wilmington, Delaware, United States, 19803
      • Alfred I duPont Hospital for Children
  • District of Columbia
    • Washington, District of Columbia, United States, 20010
      • Children's National Medical Center
    • Washington, District of Columbia, United States, 20007
      • MedStar Georgetown University Hospital
  • Florida
    • Fort Lauderdale, Florida, United States, 33316
      • Broward Health Medical Center
    • Fort Myers, Florida, United States, 33908
      • Golisano Children's Hospital of Southwest Florida
    • Gainesville, Florida, United States, 32610
      • University of Florida Health Science Center - Gainesville
    • Jacksonville, Florida, United States, 32207
      • Nemours Children's Clinic-Jacksonville
    • Miami, Florida, United States, 33155
      • Nicklaus Children's Hospital
    • Miami, Florida, United States, 33136
      • University of Miami Miller School of Medicine-Sylvester Cancer Center
    • Miami, Florida, United States, 33136
      • Jackson Memorial Hospital-Holtz Children's Hospital
    • Orlando, Florida, United States, 32827
      • Nemours Children's Hospital
    • Tampa, Florida, United States, 33607
      • Saint Joseph's Hospital/Children's Hospital-Tampa
  • Georgia
    • Atlanta, Georgia, United States, 30322
      • Children's Healthcare of Atlanta - Egleston
  • Hawaii
    • Honolulu, Hawaii, United States, 96826
      • Kapiolani Medical Center for Women and Children
  • Idaho
    • Boise, Idaho, United States, 83712
      • Saint Luke's Cancer Institute - Boise
  • Illinois
    • Peoria, Illinois, United States, 61637
      • Saint Jude Midwest Affiliate
  • Indiana
    • Indianapolis, Indiana, United States, 46202
      • Riley Hospital for Children
  • Iowa
    • Iowa City, Iowa, United States, 52242
      • University of Iowa/Holden Comprehensive Cancer Center
  • Kentucky
    • Louisville, Kentucky, United States, 40202
      • Norton Children's Hospital
  • Louisiana
    • New Orleans, Louisiana, United States, 70121
      • Ochsner Medical Center Jefferson
  • Maryland
    • Baltimore, Maryland, United States, 21215
      • Sinai Hospital of Baltimore
  • Massachusetts
    • Boston, Massachusetts, United States, 02215
      • Dana-Farber Cancer Institute
  • Michigan
    • Ann Arbor, Michigan, United States, 48109
      • C S Mott Children's Hospital
    • Grand Rapids, Michigan, United States, 49503
      • Helen DeVos Children's Hospital at Spectrum Health
    • Kalamazoo, Michigan, United States, 49007
      • Bronson Methodist Hospital
  • Minnesota
    • Minneapolis, Minnesota, United States, 55455
      • University of Minnesota/Masonic Cancer Center
    • Rochester, Minnesota, United States, 55905
      • Mayo Clinic in Rochester
  • Mississippi
    • Jackson, Mississippi, United States, 39216
      • University of Mississippi Medical Center
  • Missouri
    • Kansas City, Missouri, United States, 64108
      • Children's Mercy Hospitals and Clinics
    • Saint Louis, Missouri, United States, 63110
      • Washington University School of Medicine
    • Saint Louis, Missouri, United States, 63141
      • Mercy Hospital Saint Louis
    • Saint Louis, Missouri, United States, 63104
      • Cardinal Glennon Children's Medical Center
  • Nebraska
    • Omaha, Nebraska, United States, 68198
      • University of Nebraska Medical Center
    • Omaha, Nebraska, United States, 68114
      • Children's Hospital and Medical Center of Omaha
  • New Hampshire
    • Lebanon, New Hampshire, United States, 03756
      • Dartmouth Hitchcock Medical Center/Dartmouth Cancer Center
  • New Jersey
    • Hackensack, New Jersey, United States, 07601
      • Hackensack University Medical Center
    • Morristown, New Jersey, United States, 07960
      • Morristown Medical Center
  • New York
    • Bronx, New York, United States, 10467
      • Montefiore Medical Center - Moses Campus
    • New York, New York, United States, 10032
      • NYP/Columbia University Medical Center/Herbert Irving Comprehensive Cancer Center
  • North Carolina
    • Asheville, North Carolina, United States, 28801
      • Mission Hospital
    • Charlotte, North Carolina, United States, 28203
      • Carolinas Medical Center/Levine Cancer Institute
    • Charlotte, North Carolina, United States, 28204
      • Novant Health Presbyterian Medical Center
  • Ohio
    • Akron, Ohio, United States, 44308
      • Children's Hospital Medical Center of Akron
    • Cincinnati, Ohio, United States, 45229
      • Cincinnati Children's Hospital Medical Center
    • Cleveland, Ohio, United States, 44195
      • Cleveland Clinic Foundation
    • Columbus, Ohio, United States, 43205
      • Nationwide Children's Hospital
    • Dayton, Ohio, United States, 45404
      • Dayton Children's Hospital
  • Oklahoma
    • Oklahoma City, Oklahoma, United States, 73104
      • University of Oklahoma Health Sciences Center
  • Oregon
    • Portland, Oregon, United States, 97239
      • Oregon Health and Science University
  • Pennsylvania
    • Allentown, Pennsylvania, United States, 18103
      • Lehigh Valley Hospital-Cedar Crest
    • Philadelphia, Pennsylvania, United States, 19104
      • Children's Hospital of Philadelphia
    • Philadelphia, Pennsylvania, United States, 19134
      • Saint Christopher's Hospital for Children
    • Pittsburgh, Pennsylvania, United States, 15224
      • Children's Hospital of Pittsburgh of UPMC
  • Rhode Island
    • Providence, Rhode Island, United States, 02903
      • Rhode Island Hospital
  • South Carolina
    • Greenville, South Carolina, United States, 29605
      • BI-LO Charities Children's Cancer Center
  • Tennessee
    • Memphis, Tennessee, United States, 38105
      • Saint Jude Children's Research Hospital
  • Texas
    • Austin, Texas, United States, 78723
      • Dell Children's Medical Center of Central Texas
    • Dallas, Texas, United States, 75390
      • UT Southwestern/Simmons Cancer Center-Dallas
    • Dallas, Texas, United States, 75230
      • Medical City Dallas Hospital
    • Houston, Texas, United States, 77030
      • Baylor College of Medicine/Dan L Duncan Comprehensive Cancer Center
    • San Antonio, Texas, United States, 78229
      • University of Texas Health Science Center at San Antonio
  • Utah
    • Salt Lake City, Utah, United States, 84113
      • Primary Children's Hospital
  • Virginia
    • Norfolk, Virginia, United States, 23507
      • Children's Hospital of The King's Daughters
  • Washington
    • Seattle, Washington, United States, 98105
      • Seattle Children's Hospital
    • Spokane, Washington, United States, 99204
      • Providence Sacred Heart Medical Center and Children's Hospital
    • Tacoma, Washington, United States, 98405
      • Mary Bridge Children's Hospital and Health Center
  • Wisconsin
    • Madison, Wisconsin, United States, 53792
      • University of Wisconsin Carbone Cancer Center
    • Marshfield, Wisconsin, United States, 54449
      • Marshfield Medical Center-Marshfield
    • Milwaukee, Wisconsin, United States, 53226
      • Children's Hospital of Wisconsin

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: No older than 30 years (Child, Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Patients must be =< 30 years of age at the time of study entry
• COHORT A: Patients must have a histologic diagnosis of infantile fibrosarcoma with an NTRK1, NTRK2, or NTRK3 fusion identified in a Clinical Laboratory Improvement Act/College of American Pathologists (CLIA/CAP) certified laboratory. Fusions may be identified by fluorescence in situ hybridization (FISH) or molecular techniques (reverse transcriptase-polymerase chain reaction [RT-PCR] using primers flanking the fusion junction or next generation sequencing). For fusions identified by FISH, an ETV6 rearrangement is sufficient for eligibility in Cohort A. Identification of the upstream TRK fusion partner is not required.
• COHORT B: Patients must have a histologic diagnosis of any solid tumor other than infantile fibrosarcoma, including central nervous system (CNS) tumors but excluding high grade gliomas. An NTRK1, NTRK2, or NTRK3 fusion must be identified in a CLIA/CAP certified laboratory. Fusions may be identified by FISH or molecular techniques (RT-PCR using primers flanking the fusion junction or next generation sequencing). For fusions identified by FISH, there must be an identified rearrangement in NTRK1, NTRK2, or NTRK3 (e.g., an ETV6 rearrangement is not sufficient for eligibility) unless the patient has a diagnosis of congenital mesoblastic nephroma in which case an ETV6 rearrangement is sufficient for eligibility. Identification of the upstream TRK fusion partner is not required.
• COHORT C: Patients must have a histologic diagnosis of relapsed or refractory acute leukemia with an NTRK1, NTRK2, or NTRK3 fusion identified in a CLIA/CAP certified laboratory. Fusions may be identified by FISH or molecular techniques (RT-PCR using primers flanking the fusion junction or next generation sequencing). For fusions identified by FISH, there must be an identified rearrangement in NTRK1, NTRK2, or NTRK3 (e.g., an ETV6 rearrangement is not sufficient for eligibility). Identification of the upstream TRK fusion partner is not required.
• SOLID TUMORS (COHORTS A AND B): Patients must have measurable disease. Patients must have disease that cannot be completely resected without a predicted functional, neurologic, or significant cosmetic deficit in the opinion of the investigator.
• LEUKEMIA (COHORT C): Patients must have >= 5% blasts in the bone marrow. Extramedullary disease is permitted.
• Patients must have a Lansky or Karnofsky performance status score of >= 50, corresponding to Eastern Cooperative Oncology Group (ECOG) categories 0, 1 or 2. Use Karnofsky for patients > 16 years of age and Lansky for patients =< 16 years of age. NOTE: Neurologic deficits in patients with CNS tumors must have been stable for at least 7 days prior to study enrollment. 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.

• COHORTS A AND B: No prior anti-cancer therapy, including radiotherapy, other than surgical resection is permitted.

  • Patients who experience recurrence after surgery alone and no other anti-cancer therapy will be eligible.
  • If not eligible due to prior anticancer therapy, patients may be eligible for the larotrectinib arm of Pediatric MATCH (APEC1621A) or treatment with commercial larotrectinib off study.

• COHORT C: Patients with relapsed leukemia (Cohort C) 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 numerical 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. The duration of this interval must be discussed with the study chair and the study-assigned research coordinator prior to enrollment.

    • A waiting period prior to enrollment is not required for patients receiving standard cytotoxic maintenance chemotherapy (i.e., corticosteroid, vincristine, thioguanine [6MP], and/or methotrexate).
    • A waiting period is not required for patients receiving a single dose of intrathecal methotrexate, hydrocortisone, and/or cytarabine within 7 days prior to enrollment.

    • >= 14 days must have elapsed after the completion of other cytotoxic therapy, with the exception of hydroxyurea, for patients not receiving standard maintenance therapy. Additionally, patients must have fully recovered from all acute toxic effects of prior therapy.

      • Note: Cytoreduction with hydroxyurea must be discontinued >= 24 hours prior to the start of protocol therapy.
  • Anti-cancer agents not known to be myelosuppressive (e.g., not associated with reduced platelet or absolute neutrophil [ANC] counts): >= 7 days after the last dose of agent. The duration of this interval must be discussed with the study chair and the study-assigned research coordinator prior to enrollment.
  • Anti-cancer agents that are 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. There is an exception for blinatumomab infusions, for which patients must have been off for at least 3 days and all drug related toxicity must have resolved to grade 2 or lower as outlined in the inclusion/exclusion criteria.
  • Corticosteroids: If used to modify immune adverse events related to prior therapy, >= 14 days must have elapsed since last dose of corticosteroid. A waiting period prior to enrollment is not required for patients receiving corticosteroid for leukemia therapy/cytoreduction.
  • Hematopoietic growth factors: >= 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 and the study-assigned research coordinator.
  • Interleukins, interferons and cytokines (other than hematopoietic growth factors): >= 21 days after the completion of interleukins, interferon or cytokines (other than hematopoietic growth factors ).

  • Stem cell infusions (with or without total body irradiation [TBI]):

    • Allogeneic (non-autologous) bone marrow or stem cell transplant, or any stem cell infusion including donor lymphocyte infusion (DLI) or boost infusion: >= 84 days after infusion and no evidence of graft versus host disease (GVHD).
    • Autologous stem cell infusion including boost infusion: >= 42 days.
  • Cellular therapy: >= 42 days after the completion of any type of cellular therapy (e.g., modified T cells, natural killer [NK] cells, dendritic cells, etc.)
  • Radiation therapy (XRT)/external beam irradiation including protons: >= 14 days after local XRT; >= 150 days after TBI, craniospinal XRT or if radiation to >= 50% of the pelvis; >= 42 days if other substantial BM radiation.
  • Radiopharmaceutical therapy (e.g., radiolabeled antibody): >= 42 days after systemically administered radiopharmaceutical therapy.
  • Patients must not have received prior exposure to TRK inhibitors (including larotrectinib, LOXO-195, entrectinib, lorlatinib, crizotinib, or lestaurtinib).
• For patients with solid tumors without known bone marrow involvement: Peripheral absolute neutrophil count (ANC) >= 1000/mm^3 (within 7 days prior to enrollment).
• For patients with solid tumors without known bone marrow involvement: Platelet count >= 100,000/mm^3 (transfusion independent, defined as not receiving platelet transfusions for at least 7 days prior to enrollment).
• For patients with solid tumors without known bone marrow involvement: Hemoglobin >= 8.0 g/dL at baseline (within 7 days prior to enrollment) (may receive red blood cell [RBC] transfusions).
• Patients with solid tumors 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.
• For patients with leukemia: Platelet count >= 20,000/mm^3 (within 7 days prior to enrollment) (may receive platelet transfusions; must not be known to be refractory to red cell or platelet transfusion).
• For patients with leukemia: Hemoglobin >= 8.0 g/dL at baseline (within 7 days prior to enrollment) (may receive RBC transfusions; must not be known to be refractory to red cell or platelet transfusion).

• 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 (within 7 days prior to enrollment):

  • 1 month to < 6 months (male 0.4 mg/dL, female 0.4 mg/dL)
  • 6 months to < 1 year (male 0.5 mg/dL, female 0.5 mg/dL)
  • 1 to < 2 years (male 0.6 mg/dL, female 0.6 mg/dL)
  • 2 to < 6 years (male 0.8 mg/dL, female 0.8 mg/dL)
  • 6 to < 10 years (male 1 mg/dL, female 1 mg/dL)
  • 10 to < 13 years (male 1.2 mg/dL, female 1.2 mg/dL)
  • 13 to < 16 years (male 1.5 mg/dL, female 1.4 mg/dL)

  • >= 16 years (male 1.7 mg/dL, female 1.4 mg/dL)

    • For patients < 1 month of age, serum creatinine levels must be < 1.5 x the treating institution's creatinine upper limit of normal (ULN) for patients < 1 month of age or the creatinine clearance or radioisotope GFR must be >= 70 mL/min/1.73 m^2.
• Patients with solid tumors: Bilirubin (sum of conjugated + unconjugated) =< 1.5 x upper limit of normal (ULN) for age (within 7 days prior to enrollment). After approval of the study chair or designee, infants with a higher total bilirubin due to physiologic or breast milk jaundice are eligible if the conjugated (direct) bilirubin is =< 2 mg/dL.
• Patients with solid tumors: Serum glutamate pyruvate transaminase (SGPT) (alanine aminotransferase [ALT]) =< 135 U/L (within 7 days prior to enrollment). For the purpose of this study, the ULN for SGPT is 45 U/L.
• Patients with solid tumors: Serum albumin >= 2 g/dL (within 7 days prior to enrollment).
• Patients with leukemias: Conjugated (direct) bilirubin =< 1.5 x upper limit of normal (ULN) for age (within 7 days prior to enrollment).
• Patients with leukemias: SGPT (ALT) =< 225 U/L (within 7 days prior to enrollment). For the purpose of this study, the ULN for SGPT is 45 U/L.
• Patients with leukemias: Serum albumin >= 2 g/dL (within 7 days prior to enrollment).
• Patients with seizure disorder may be enrolled if on a stable antiepileptic regimen for >= 14 days and well controlled.
• Nervous system disorders (Common Terminology Criteria for Adverse Events [CTCAE] version [v] 5) except tendon reflex decreased resulting from prior therapy must be =< grade 2.
• All patients and/or their parents or legal guardians must sign a written informed consent.
• All institutional, Food and Drug Administration (FDA), and National Cancer Institute (NCI) requirements for human studies must be met.

Exclusion Criteria:

• Pregnant or breast-feeding women will not be entered on this study due to risks of fetal and teratogenic adverse events as seen in animal/human studies, OR because there is yet no available information regarding human fetal or teratogenic toxicities. Pregnancy tests must be obtained in girls who are post-menarchal. Female patients of reproductive potential may not participate unless they have agreed to use a highly effective contraceptive method for the duration of study therapy and for at least one month after the final dose of larotrectinib. Males of reproductive potential with a non-pregnant female partner of child-bearing potential must use a highly effective contraception for the duration of the study and for at least one month after the final dose of larotrectinib. Because of the unknown risk of larotrectinib in nursing infants, nursing women should discontinue breastfeeding during treatment with larotrectinib and for 3 days following the final dose.
• Patients with solid tumors, including CNS tumors, requiring corticosteroids who have not been on a stable or decreasing dose of corticosteroid for at least 7 days prior to enrollment are not eligible. Patients with leukemia may receive systemic corticosteroids for cytoreduction up to 24 hours prior to the start of protocol therapy. If used to modify immune adverse events related to prior therapy, >= 14 days must have elapsed since last dose of corticosteroid.
• Patients who are currently receiving another investigational drug are not eligible.
• Patients who are currently receiving other anti-cancer agents are not eligible [except leukemia patients receiving corticosteroids or hydroxyurea, which may be continued until 24 hours prior to start of protocol therapy]. Patients with leukemia should receive a single dose of intrathecal cytarabine, hydrocortisone, and/or methotrexate within 7 days prior to Day 1 of Cycle 1 at the time of the baseline lumbar puncture.
• Patients who are receiving cyclosporine, tacrolimus or other agents to prevent graft-versus-host disease post bone marrow transplant are not eligible for this trial.
• Patients currently receiving a strong CYP3A4 inducer or inhibitor are not eligible. Strong inducers or inhibitors of CYP3A4 should be avoided from 14 days prior to enrollment to the end of the study. Note: CYP3A4 inducing anti-epileptic drugs and dexamethasone for CNS tumors or metastases, on a stable dose, are allowed.
• Patients with malabsorption syndrome or other conditions that significantly limit enteral absorption are not eligible.
• Patients who are unable to swallow capsules or liquid and do not have gastric access via a nasogastric or gastrostomy tube are not eligible.
• Patients who have an uncontrolled infection are not eligible.
• Patients who have received prior solid organ transplantation 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 with high grade gliomas (HGG) are not eligible.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Treatment (larotrectinib); Patients receive larotrectinib PO or by NG or G-tube BID on days 1-28. Treatment repeats every 28 days for up to 26 cycles in the absence of disease progression or unacceptable toxicity, or complete surgical resection of tumor.	Drug: Larotrectinib Sulfate; Given PO or via NG or G tube; Other Names: ARRY 470 Sulfate; LOXO 101 Sulfate; LOXO-101 Sulfate; Vitrakvi

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Objective response rate (ORR) of children with infantile fibrosarcoma (IFS) treated with neoadjuvant larotrectinib prior to local control	Response rates will be calculated as the percent of evaluable patients who are responders, and confidence intervals will be constructed accounting for the two-stage design.	Up to 5 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Event-free survival (EFS) of children with IFS treated with neoadjuvant larotrectinib prior to local control	Will be computed one year after the last enrollment in a stratum.	Up to 5 years
Overall survival (OS) of children with IFS treated with neoadjuvant larotrectinib prior to local control	Will be computed one year after the last enrollment in a stratum.	Up to 5 years
Duration of response (DoR) of children with IFS treated with neoadjuvant larotrectinib prior to local control	Will be computed one year after the last enrollment in a stratum. Will be defined among patients with a confirmed best response of either PR and CR.	From first observation of either partial response (PR) or complete response (CR) until either the first observation of progressive disease (PD) (event) or last known observation of the patient (censored observation), assessed up to 5 years
ORR of children with newly diagnosed TRK fusion solid tumors other than IFS treated with neoadjuvant larotrectinib prior to local control	Response rates will be calculated as the percent of evaluable patients who are responders, and confidence intervals will be constructed accounting for the two-stage design.	Up to 5 years
EFS of children with newly diagnosed TRK fusion solid tumors other than IFS treated with neoadjuvant larotrectinib prior to local control	Will be computed one year after the last enrollment in a stratum.	Up to 5 years
OS of children with newly diagnosed TRK fusion solid tumors other than IFS treated with neoadjuvant larotrectinib prior to local control	Will be computed one year after the last enrollment in a stratum.	Up to 5 years
DoR of children with newly diagnosed TRK fusion solid tumors other than IFS treated with neoadjuvant larotrectinib prior to local control	Will be computed one year after the last enrollment in a stratum. Will be defined among patients with a confirmed best response of either PR and CR.	From first observation of either partial response (PR) or complete response (CR) until either the first observation of progressive disease (PD) (event) or last known observation of the patient (censored observation), assessed up to 5 years
Incidence of adverse events	Per National Cancer Institute Common Terminology Criteria for Adverse Events version 5.0. Toxicity tables will be constructed to summarize the observed incidence by type of toxicity and grade. A patient will be counted only once for a given toxicity for the worst grade of that toxicity reported for that patient. Toxicity information recorded will include the type, severity, time of onset, time of resolution, and the attribution(s) to the study regimen.	Up to 5 years
Percentage of patients with TRK fusion solid tumors with detectable circulating tumor deoxyribonucleic acid (DNA)	The percentage of ctDNA and frequency with which patients have detectable ctDNA prior to the start of therapy and at times during therapy when subsequent serial samples are obtained will be summarized with simple summary statistics, including means, medians, ranges, and standard deviations (if numbers and distribution permit). In cases of treatment resistance, we will also perform exploratory deep sequencing of ctDNA to determine whether this method can detect the emergence of resistance mutations.	Baseline up to 5 years

Collaborators and Investigators

• Sponsor: Children's Oncology Group
• Collaborators: National Cancer Institute (NCI)
• Investigators: Principal Investigator: Theodore W Laetsch, Children's Oncology Group

Study record dates

Study Major Dates

• Study Start (Actual): October 25, 2019
• Primary Completion (Estimated): September 30, 2024
• Study Completion (Estimated): September 30, 2024

Study Registration Dates

• First Submitted: January 22, 2019
• First Submitted That Met QC Criteria: February 6, 2019
• First Posted (Actual): February 8, 2019

Study Record Updates

• Last Update Posted (Actual): March 22, 2024
• Last Update Submitted That Met QC Criteria: March 21, 2024
• Last Verified: March 1, 2024

More Information

Terms related to this study

• Keywords: Larotrectinib; NTRK fusion; TRK fusion; Infantile fibrosarcoma
• Additional Relevant MeSH Terms: Pathologic Processes; Nervous System Diseases; Neoplasms, Connective and Soft Tissue; Neoplasms by Histologic Type; Neoplasms by Site; Disease Attributes; Hematologic Diseases; Neoplasms, Connective Tissue; Sarcoma; Neoplasms, Fibrous Tissue; Neoplasms; Leukemia; Nervous System Neoplasms; Central Nervous System Neoplasms; Acute Disease; Fibrosarcoma
• Other Study ID Numbers: ADVL1823 (Other Identifier: CTEP); U10CA180886 (U.S. NIH Grant/Contract); NCI-2019-00015 (Registry Identifier: CTRP (Clinical Trial Reporting Program))

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No