Larotrectinib for paediatric solid tumours harbouring NTRK gene fusions: phase 1 results from a multicentre, open-label, phase 1/2 study

Gene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib, a highly selective small-molecule inhibitor of the TRK kinases, had shown activity in preclinical models and in adults with tumours harbouring TRK fusions. This...

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Vydané v:The lancet oncology Ročník 19; číslo 5; s. 705 - 714
Hlavní autori: Laetsch, Theodore W, DuBois, Steven G, Mascarenhas, Leo, Turpin, Brian, Federman, Noah, Albert, Catherine M, Nagasubramanian, Ramamoorthy, Davis, Jessica L, Rudzinski, Erin, Feraco, Angela M, Tuch, Brian B, Ebata, Kevin T, Reynolds, Mark, Smith, Steven, Cruickshank, Scott, Cox, Michael C, Pappo, Alberto S, Hawkins, Douglas S
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: England Elsevier Ltd 01.05.2018
Elsevier Limited
Predmet:
Administration, Oral
Adolescent
Adolescents
Age
Age Factors
Alanine
Alanine transaminase
Anthracycline
Antineoplastic Agents - administration & dosage
Antineoplastic Agents - adverse effects
Aspartate aminotransferase
Biomarkers, Tumor - antagonists & inhibitors
Biomarkers, Tumor - genetics
Cancer therapies
Central nervous system
Chemotherapy
Child
Child, Preschool
Children
Clinical trials
Discoidin Domain Receptor 2 - antagonists & inhibitors
Discoidin Domain Receptor 2 - genetics
Drug Administration Schedule
Female
Fibrosarcoma
Gene Fusion
Humans
Infant
Infants
Kinases
Leukopenia
Male
Membrane Glycoproteins - antagonists & inhibitors
Membrane Glycoproteins - genetics
Metastases
Metastasis
Nausea
Neoplasms - drug therapy
Neoplasms - genetics
Neoplasms - pathology
Neuroblastoma
Neutrophils
Oncology
Papillary thyroid cancer
Patients
Pediatrics
Protein Kinase Inhibitors - administration & dosage
Protein Kinase Inhibitors - adverse effects
Pyrazoles - administration & dosage
Pyrazoles - adverse effects
Pyrimidines - administration & dosage
Pyrimidines - adverse effects
Receptor Protein-Tyrosine Kinases - antagonists & inhibitors
Receptor Protein-Tyrosine Kinases - genetics
Receptor, trkA - antagonists & inhibitors
Receptor, trkA - genetics
Receptor, trkB - antagonists & inhibitors
Receptor, trkB - genetics
Safety
Solid tumors
Surgery
Thyroid cancer
Time Factors
Toxicity
Treatment Outcome
Tumors
United States
Vomiting
Young Adult
United States
ISSN:1470-2045, 1474-5488, 1474-5488
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Abstract Gene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib, a highly selective small-molecule inhibitor of the TRK kinases, had shown activity in preclinical models and in adults with tumours harbouring TRK fusions. This study aimed to assess the safety of larotrectinib in paediatric patients. This multicentre, open-label, phase 1/2 study was done at eight sites in the USA and enrolled infants, children, and adolescents aged 1 month to 21 years with locally advanced or metastatic solid tumours or CNS tumours that had relapsed, progressed, or were non-responsive to available therapies regardless of TRK fusion status; had a Karnofsky (≥16 years of age) or Lansky (<16 years of age) performance status score of 50 or more, adequate organ function, and full recovery from the acute toxic effects of all previous anticancer therapy. Following a protocol amendment on Sept 12, 2016, patients with locally advanced infantile fibrosarcoma who would require disfiguring surgery to achieve a complete surgical resection were also eligible. Patients were enrolled to three dose cohorts according to a rolling six design. Larotrectinib was administered orally (capsule or liquid formulation), twice daily, on a continuous 28-day schedule, in increasing doses adjusted for age and bodyweight. The primary endpoint of the phase 1 dose escalation component was the safety of larotrectinib, including dose-limiting toxicity. All patients who received at least one dose of larotrectinib were included in the safety analyses. Reported here are results of the phase 1 dose escalation cohort. Phase 1 follow-up and phase 2 are ongoing. This trial is registered with ClinicalTrials.gov, number NCT02637687. Between Dec 21, 2015, and April 13, 2017, 24 patients (n=17 with tumours harbouring TRK fusions, n=7 without a documented TRK fusion) with a median age of 4·5 years (IQR 1·3–13·3) were enrolled to three dose cohorts: cohorts 1 and 2 were assigned doses on the basis of both age and bodyweight predicted by use of SimCyp modelling to achieve an area under the curve equivalent to the adult doses of 100 mg twice daily (cohort 1) and 150 mg twice daily (cohort 2); and cohort 3 was assigned to receive a dose of 100 mg/m2 twice daily (maximum 100 mg per dose), regardless of age, equating to a maximum of 173% of the recommended adult phase 2 dose. Among enrolled patients harbouring TRK fusion-positive cancers, eight (47%) had infantile fibrosarcoma, seven (41%) had other soft tissue sarcomas, and two (12%) had papillary thyroid cancer. Adverse events were predominantly grade 1 or 2 (occurring in 21 [88%] of 24 patients); the most common larotrectinib-related adverse events of all grades were increased alanine and aspartate aminotransferase (ten [42%] of 24 each), leucopenia (five [21%] of 24), decreased neutrophil count (five [21%] of 24), and vomiting (five [21%] of 24). Grade 3 alanine aminotransferase elevation was the only dose-limiting toxicity and occurred in one patient without a TRK fusion and with progressive disease. No grade 4 or 5 treatment-related adverse events were observed. Two larotrectinib-related serious adverse events were observed: grade 3 nausea and grade 3 ejection fraction decrease during the 28-day follow-up after discontinuing larotrectinib and while on anthracyclines. The maximum tolerated dose was not reached, and 100 mg/m2 (maximum of 100 mg per dose) was established as the recommended phase 2 dose. 14 (93%) of 15 patients with TRK fusion-positive cancers achieved an objective response as per Response Evaluation Criteria In Solid Tumors version 1.1; the remaining patient had tumour regression that did not meet the criteria for objective response. None of the seven patients with TRK fusion-negative cancers had an objective response. The TRK inhibitor larotrectinib was well tolerated in paediatric patients and showed encouraging antitumour activity in all patients with TRK fusion-positive tumours. The recommended phase 2 dose was defined as 100mg/m2 (maximum 100 mg per dose) for infants, children, and adolescents, regardless of age. Loxo Oncology Inc.
AbstractList Gene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib, a highly selective small-molecule inhibitor of the TRK kinases, had shown activity in preclinical models and in adults with tumours harbouring TRK fusions. This study aimed to assess the safety of larotrectinib in paediatric patients.BACKGROUNDGene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib, a highly selective small-molecule inhibitor of the TRK kinases, had shown activity in preclinical models and in adults with tumours harbouring TRK fusions. This study aimed to assess the safety of larotrectinib in paediatric patients.This multicentre, open-label, phase 1/2 study was done at eight sites in the USA and enrolled infants, children, and adolescents aged 1 month to 21 years with locally advanced or metastatic solid tumours or CNS tumours that had relapsed, progressed, or were non-responsive to available therapies regardless of TRK fusion status; had a Karnofsky (≥16 years of age) or Lansky (<16 years of age) performance status score of 50 or more, adequate organ function, and full recovery from the acute toxic effects of all previous anticancer therapy. Following a protocol amendment on Sept 12, 2016, patients with locally advanced infantile fibrosarcoma who would require disfiguring surgery to achieve a complete surgical resection were also eligible. Patients were enrolled to three dose cohorts according to a rolling six design. Larotrectinib was administered orally (capsule or liquid formulation), twice daily, on a continuous 28-day schedule, in increasing doses adjusted for age and bodyweight. The primary endpoint of the phase 1 dose escalation component was the safety of larotrectinib, including dose-limiting toxicity. All patients who received at least one dose of larotrectinib were included in the safety analyses. Reported here are results of the phase 1 dose escalation cohort. Phase 1 follow-up and phase 2 are ongoing. This trial is registered with ClinicalTrials.gov, number NCT02637687.METHODSThis multicentre, open-label, phase 1/2 study was done at eight sites in the USA and enrolled infants, children, and adolescents aged 1 month to 21 years with locally advanced or metastatic solid tumours or CNS tumours that had relapsed, progressed, or were non-responsive to available therapies regardless of TRK fusion status; had a Karnofsky (≥16 years of age) or Lansky (<16 years of age) performance status score of 50 or more, adequate organ function, and full recovery from the acute toxic effects of all previous anticancer therapy. Following a protocol amendment on Sept 12, 2016, patients with locally advanced infantile fibrosarcoma who would require disfiguring surgery to achieve a complete surgical resection were also eligible. Patients were enrolled to three dose cohorts according to a rolling six design. Larotrectinib was administered orally (capsule or liquid formulation), twice daily, on a continuous 28-day schedule, in increasing doses adjusted for age and bodyweight. The primary endpoint of the phase 1 dose escalation component was the safety of larotrectinib, including dose-limiting toxicity. All patients who received at least one dose of larotrectinib were included in the safety analyses. Reported here are results of the phase 1 dose escalation cohort. Phase 1 follow-up and phase 2 are ongoing. This trial is registered with ClinicalTrials.gov, number NCT02637687.Between Dec 21, 2015, and April 13, 2017, 24 patients (n=17 with tumours harbouring TRK fusions, n=7 without a documented TRK fusion) with a median age of 4·5 years (IQR 1·3-13·3) were enrolled to three dose cohorts: cohorts 1 and 2 were assigned doses on the basis of both age and bodyweight predicted by use of SimCyp modelling to achieve an area under the curve equivalent to the adult doses of 100 mg twice daily (cohort 1) and 150 mg twice daily (cohort 2); and cohort 3 was assigned to receive a dose of 100 mg/m2 twice daily (maximum 100 mg per dose), regardless of age, equating to a maximum of 173% of the recommended adult phase 2 dose. Among enrolled patients harbouring TRK fusion-positive cancers, eight (47%) had infantile fibrosarcoma, seven (41%) had other soft tissue sarcomas, and two (12%) had papillary thyroid cancer. Adverse events were predominantly grade 1 or 2 (occurring in 21 [88%] of 24 patients); the most common larotrectinib-related adverse events of all grades were increased alanine and aspartate aminotransferase (ten [42%] of 24 each), leucopenia (five [21%] of 24), decreased neutrophil count (five [21%] of 24), and vomiting (five [21%] of 24). Grade 3 alanine aminotransferase elevation was the only dose-limiting toxicity and occurred in one patient without a TRK fusion and with progressive disease. No grade 4 or 5 treatment-related adverse events were observed. Two larotrectinib-related serious adverse events were observed: grade 3 nausea and grade 3 ejection fraction decrease during the 28-day follow-up after discontinuing larotrectinib and while on anthracyclines. The maximum tolerated dose was not reached, and 100 mg/m2 (maximum of 100 mg per dose) was established as the recommended phase 2 dose. 14 (93%) of 15 patients with TRK fusion-positive cancers achieved an objective response as per Response Evaluation Criteria In Solid Tumors version 1.1; the remaining patient had tumour regression that did not meet the criteria for objective response. None of the seven patients with TRK fusion-negative cancers had an objective response.FINDINGSBetween Dec 21, 2015, and April 13, 2017, 24 patients (n=17 with tumours harbouring TRK fusions, n=7 without a documented TRK fusion) with a median age of 4·5 years (IQR 1·3-13·3) were enrolled to three dose cohorts: cohorts 1 and 2 were assigned doses on the basis of both age and bodyweight predicted by use of SimCyp modelling to achieve an area under the curve equivalent to the adult doses of 100 mg twice daily (cohort 1) and 150 mg twice daily (cohort 2); and cohort 3 was assigned to receive a dose of 100 mg/m2 twice daily (maximum 100 mg per dose), regardless of age, equating to a maximum of 173% of the recommended adult phase 2 dose. Among enrolled patients harbouring TRK fusion-positive cancers, eight (47%) had infantile fibrosarcoma, seven (41%) had other soft tissue sarcomas, and two (12%) had papillary thyroid cancer. Adverse events were predominantly grade 1 or 2 (occurring in 21 [88%] of 24 patients); the most common larotrectinib-related adverse events of all grades were increased alanine and aspartate aminotransferase (ten [42%] of 24 each), leucopenia (five [21%] of 24), decreased neutrophil count (five [21%] of 24), and vomiting (five [21%] of 24). Grade 3 alanine aminotransferase elevation was the only dose-limiting toxicity and occurred in one patient without a TRK fusion and with progressive disease. No grade 4 or 5 treatment-related adverse events were observed. Two larotrectinib-related serious adverse events were observed: grade 3 nausea and grade 3 ejection fraction decrease during the 28-day follow-up after discontinuing larotrectinib and while on anthracyclines. The maximum tolerated dose was not reached, and 100 mg/m2 (maximum of 100 mg per dose) was established as the recommended phase 2 dose. 14 (93%) of 15 patients with TRK fusion-positive cancers achieved an objective response as per Response Evaluation Criteria In Solid Tumors version 1.1; the remaining patient had tumour regression that did not meet the criteria for objective response. None of the seven patients with TRK fusion-negative cancers had an objective response.The TRK inhibitor larotrectinib was well tolerated in paediatric patients and showed encouraging antitumour activity in all patients with TRK fusion-positive tumours. The recommended phase 2 dose was defined as 100mg/m2 (maximum 100 mg per dose) for infants, children, and adolescents, regardless of age.INTERPRETATIONThe TRK inhibitor larotrectinib was well tolerated in paediatric patients and showed encouraging antitumour activity in all patients with TRK fusion-positive tumours. The recommended phase 2 dose was defined as 100mg/m2 (maximum 100 mg per dose) for infants, children, and adolescents, regardless of age.Loxo Oncology Inc.FUNDINGLoxo Oncology Inc.
Gene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib, a highly selective small-molecule inhibitor of the TRK kinases, had shown activity in preclinical models and in adults with tumours harbouring TRK fusions. This study aimed to assess the safety of larotrectinib in paediatric patients. This multicentre, open-label, phase 1/2 study was done at eight sites in the USA and enrolled infants, children, and adolescents aged 1 month to 21 years with locally advanced or metastatic solid tumours or CNS tumours that had relapsed, progressed, or were non-responsive to available therapies regardless of TRK fusion status; had a Karnofsky (≥16 years of age) or Lansky (<16 years of age) performance status score of 50 or more, adequate organ function, and full recovery from the acute toxic effects of all previous anticancer therapy. Following a protocol amendment on Sept 12, 2016, patients with locally advanced infantile fibrosarcoma who would require disfiguring surgery to achieve a complete surgical resection were also eligible. Patients were enrolled to three dose cohorts according to a rolling six design. Larotrectinib was administered orally (capsule or liquid formulation), twice daily, on a continuous 28-day schedule, in increasing doses adjusted for age and bodyweight. The primary endpoint of the phase 1 dose escalation component was the safety of larotrectinib, including dose-limiting toxicity. All patients who received at least one dose of larotrectinib were included in the safety analyses. Reported here are results of the phase 1 dose escalation cohort. Phase 1 follow-up and phase 2 are ongoing. This trial is registered with ClinicalTrials.gov, number NCT02637687. Between Dec 21, 2015, and April 13, 2017, 24 patients (n=17 with tumours harbouring TRK fusions, n=7 without a documented TRK fusion) with a median age of 4·5 years (IQR 1·3-13·3) were enrolled to three dose cohorts: cohorts 1 and 2 were assigned doses on the basis of both age and bodyweight predicted by use of SimCyp modelling to achieve an area under the curve equivalent to the adult doses of 100 mg twice daily (cohort 1) and 150 mg twice daily (cohort 2); and cohort 3 was assigned to receive a dose of 100 mg/m twice daily (maximum 100 mg per dose), regardless of age, equating to a maximum of 173% of the recommended adult phase 2 dose. Among enrolled patients harbouring TRK fusion-positive cancers, eight (47%) had infantile fibrosarcoma, seven (41%) had other soft tissue sarcomas, and two (12%) had papillary thyroid cancer. Adverse events were predominantly grade 1 or 2 (occurring in 21 [88%] of 24 patients); the most common larotrectinib-related adverse events of all grades were increased alanine and aspartate aminotransferase (ten [42%] of 24 each), leucopenia (five [21%] of 24), decreased neutrophil count (five [21%] of 24), and vomiting (five [21%] of 24). Grade 3 alanine aminotransferase elevation was the only dose-limiting toxicity and occurred in one patient without a TRK fusion and with progressive disease. No grade 4 or 5 treatment-related adverse events were observed. Two larotrectinib-related serious adverse events were observed: grade 3 nausea and grade 3 ejection fraction decrease during the 28-day follow-up after discontinuing larotrectinib and while on anthracyclines. The maximum tolerated dose was not reached, and 100 mg/m (maximum of 100 mg per dose) was established as the recommended phase 2 dose. 14 (93%) of 15 patients with TRK fusion-positive cancers achieved an objective response as per Response Evaluation Criteria In Solid Tumors version 1.1; the remaining patient had tumour regression that did not meet the criteria for objective response. None of the seven patients with TRK fusion-negative cancers had an objective response. The TRK inhibitor larotrectinib was well tolerated in paediatric patients and showed encouraging antitumour activity in all patients with TRK fusion-positive tumours. The recommended phase 2 dose was defined as 100mg/m (maximum 100 mg per dose) for infants, children, and adolescents, regardless of age. Loxo Oncology Inc.
Gene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib, a highly selective small-molecule inhibitor of the TRK kinases, had shown activity in preclinical models and in adults with tumours harbouring TRK fusions. This study aimed to assess the safety of larotrectinib in paediatric patients. This multicentre, open-label, phase 1/2 study was done at eight sites in the USA and enrolled infants, children, and adolescents aged 1 month to 21 years with locally advanced or metastatic solid tumours or CNS tumours that had relapsed, progressed, or were non-responsive to available therapies regardless of TRK fusion status; had a Karnofsky (≥16 years of age) or Lansky (<16 years of age) performance status score of 50 or more, adequate organ function, and full recovery from the acute toxic effects of all previous anticancer therapy. Following a protocol amendment on Sept 12, 2016, patients with locally advanced infantile fibrosarcoma who would require disfiguring surgery to achieve a complete surgical resection were also eligible. Patients were enrolled to three dose cohorts according to a rolling six design. Larotrectinib was administered orally (capsule or liquid formulation), twice daily, on a continuous 28-day schedule, in increasing doses adjusted for age and bodyweight. The primary endpoint of the phase 1 dose escalation component was the safety of larotrectinib, including dose-limiting toxicity. All patients who received at least one dose of larotrectinib were included in the safety analyses. Reported here are results of the phase 1 dose escalation cohort. Phase 1 follow-up and phase 2 are ongoing. This trial is registered with ClinicalTrials.gov, number NCT02637687. Between Dec 21, 2015, and April 13, 2017, 24 patients (n=17 with tumours harbouring TRK fusions, n=7 without a documented TRK fusion) with a median age of 4·5 years (IQR 1·3–13·3) were enrolled to three dose cohorts: cohorts 1 and 2 were assigned doses on the basis of both age and bodyweight predicted by use of SimCyp modelling to achieve an area under the curve equivalent to the adult doses of 100 mg twice daily (cohort 1) and 150 mg twice daily (cohort 2); and cohort 3 was assigned to receive a dose of 100 mg/m2 twice daily (maximum 100 mg per dose), regardless of age, equating to a maximum of 173% of the recommended adult phase 2 dose. Among enrolled patients harbouring TRK fusion-positive cancers, eight (47%) had infantile fibrosarcoma, seven (41%) had other soft tissue sarcomas, and two (12%) had papillary thyroid cancer. Adverse events were predominantly grade 1 or 2 (occurring in 21 [88%] of 24 patients); the most common larotrectinib-related adverse events of all grades were increased alanine and aspartate aminotransferase (ten [42%] of 24 each), leucopenia (five [21%] of 24), decreased neutrophil count (five [21%] of 24), and vomiting (five [21%] of 24). Grade 3 alanine aminotransferase elevation was the only dose-limiting toxicity and occurred in one patient without a TRK fusion and with progressive disease. No grade 4 or 5 treatment-related adverse events were observed. Two larotrectinib-related serious adverse events were observed: grade 3 nausea and grade 3 ejection fraction decrease during the 28-day follow-up after discontinuing larotrectinib and while on anthracyclines. The maximum tolerated dose was not reached, and 100 mg/m2 (maximum of 100 mg per dose) was established as the recommended phase 2 dose. 14 (93%) of 15 patients with TRK fusion-positive cancers achieved an objective response as per Response Evaluation Criteria In Solid Tumors version 1.1; the remaining patient had tumour regression that did not meet the criteria for objective response. None of the seven patients with TRK fusion-negative cancers had an objective response. The TRK inhibitor larotrectinib was well tolerated in paediatric patients and showed encouraging antitumour activity in all patients with TRK fusion-positive tumours. The recommended phase 2 dose was defined as 100mg/m2 (maximum 100 mg per dose) for infants, children, and adolescents, regardless of age. Loxo Oncology Inc.
Summary Background Gene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib, a highly selective small-molecule inhibitor of the TRK kinases, had shown activity in preclinical models and in adults with tumours harbouring TRK fusions. This study aimed to assess the safety of larotrectinib in paediatric patients. Methods This multicentre, open-label, phase 1/2 study was done at eight sites in the USA and enrolled infants, children, and adolescents aged 1 month to 21 years with locally advanced or metastatic solid tumours or CNS tumours that had relapsed, progressed, or were non-responsive to available therapies regardless of TRK fusion status; had a Karnofsky (≥16 years of age) or Lansky (<16 years of age) performance status score of 50 or more, adequate organ function, and full recovery from the acute toxic effects of all previous anticancer therapy. Following a protocol amendment on Sept 12, 2016, patients with locally advanced infantile fibrosarcoma who would require disfiguring surgery to achieve a complete surgical resection were also eligible. Patients were enrolled to three dose cohorts according to a rolling six design. Larotrectinib was administered orally (capsule or liquid formulation), twice daily, on a continuous 28-day schedule, in increasing doses adjusted for age and bodyweight. The primary endpoint of the phase 1 dose escalation component was the safety of larotrectinib, including dose-limiting toxicity. All patients who received at least one dose of larotrectinib were included in the safety analyses. Reported here are results of the phase 1 dose escalation cohort. Phase 1 follow-up and phase 2 are ongoing. This trial is registered with ClinicalTrials.gov, number NCT02637687. Findings Between Dec 21, 2015, and April 13, 2017, 24 patients (n=17 with tumours harbouring TRK fusions, n=7 without a documented TRK fusion) with a median age of 4·5 years (IQR 1·3–13·3) were enrolled to three dose cohorts: cohorts 1 and 2 were assigned doses on the basis of both age and bodyweight predicted by use of SimCyp modelling to achieve an area under the curve equivalent to the adult doses of 100 mg twice daily (cohort 1) and 150 mg twice daily (cohort 2); and cohort 3 was assigned to receive a dose of 100 mg/m2 twice daily (maximum 100 mg per dose), regardless of age, equating to a maximum of 173% of the recommended adult phase 2 dose. Among enrolled patients harbouring TRK fusion-positive cancers, eight (47%) had infantile fibrosarcoma, seven (41%) had other soft tissue sarcomas, and two (12%) had papillary thyroid cancer. Adverse events were predominantly grade 1 or 2 (occurring in 21 [88%] of 24 patients); the most common larotrectinib-related adverse events of all grades were increased alanine and aspartate aminotransferase (ten [42%] of 24 each), leucopenia (five [21%] of 24), decreased neutrophil count (five [21%] of 24), and vomiting (five [21%] of 24). Grade 3 alanine aminotransferase elevation was the only dose-limiting toxicity and occurred in one patient without a TRK fusion and with progressive disease. No grade 4 or 5 treatment-related adverse events were observed. Two larotrectinib-related serious adverse events were observed: grade 3 nausea and grade 3 ejection fraction decrease during the 28-day follow-up after discontinuing larotrectinib and while on anthracyclines. The maximum tolerated dose was not reached, and 100 mg/m2 (maximum of 100 mg per dose) was established as the recommended phase 2 dose. 14 (93%) of 15 patients with TRK fusion-positive cancers achieved an objective response as per Response Evaluation Criteria In Solid Tumors version 1.1; the remaining patient had tumour regression that did not meet the criteria for objective response. None of the seven patients with TRK fusion-negative cancers had an objective response. Interpretation The TRK inhibitor larotrectinib was well tolerated in paediatric patients and showed encouraging antitumour activity in all patients with TRK fusion-positive tumours. The recommended phase 2 dose was defined as 100mg/m2 (maximum 100 mg per dose) for infants, children, and adolescents, regardless of age. Funding Loxo Oncology Inc.
Author Davis, Jessica L
Rudzinski, Erin
Ebata, Kevin T
Cruickshank, Scott
Mascarenhas, Leo
Federman, Noah
Pappo, Alberto S
Turpin, Brian
Nagasubramanian, Ramamoorthy
Laetsch, Theodore W
DuBois, Steven G
Reynolds, Mark
Tuch, Brian B
Cox, Michael C
Smith, Steven
Hawkins, Douglas S
Albert, Catherine M
Feraco, Angela M
Author_xml – sequence: 1
  givenname: Theodore W
  surname: Laetsch
  fullname: Laetsch, Theodore W
  email: ted.laetsch@utsouthwestern.edu
  organization: University of Texas Southwestern Medical Center/Children's Health, Dallas, TX, USA
– sequence: 2
  givenname: Steven G
  surname: DuBois
  fullname: DuBois, Steven G
  organization: Dana-Farber/Boston Children's Cancer and Blood Disorders Center and Harvard Medical School, Boston, MA, USA
– sequence: 3
  givenname: Leo
  surname: Mascarenhas
  fullname: Mascarenhas, Leo
  organization: Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
– sequence: 4
  givenname: Brian
  surname: Turpin
  fullname: Turpin, Brian
  organization: Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
– sequence: 5
  givenname: Noah
  surname: Federman
  fullname: Federman, Noah
  organization: University of California, Los Angeles, Los Angeles, CA, USA
– sequence: 6
  givenname: Catherine M
  surname: Albert
  fullname: Albert, Catherine M
  organization: Seattle Children's Hospital, University of Washington, Fred Hutchinson Cancer Research Center Seattle, WA, USA
– sequence: 7
  givenname: Ramamoorthy
  surname: Nagasubramanian
  fullname: Nagasubramanian, Ramamoorthy
  organization: Nemours Children's Hospital, Orlando, FL, USA
– sequence: 8
  givenname: Jessica L
  surname: Davis
  fullname: Davis, Jessica L
  organization: Seattle Children's Hospital, University of Washington, Fred Hutchinson Cancer Research Center Seattle, WA, USA
– sequence: 9
  givenname: Erin
  surname: Rudzinski
  fullname: Rudzinski, Erin
  organization: Seattle Children's Hospital, University of Washington, Fred Hutchinson Cancer Research Center Seattle, WA, USA
– sequence: 10
  givenname: Angela M
  surname: Feraco
  fullname: Feraco, Angela M
  organization: Dana-Farber/Boston Children's Cancer and Blood Disorders Center and Harvard Medical School, Boston, MA, USA
– sequence: 11
  givenname: Brian B
  surname: Tuch
  fullname: Tuch, Brian B
  organization: Loxo Oncology Inc, South San Francisco, CA, USA
– sequence: 12
  givenname: Kevin T
  surname: Ebata
  fullname: Ebata, Kevin T
  organization: Loxo Oncology Inc, South San Francisco, CA, USA
– sequence: 13
  givenname: Mark
  surname: Reynolds
  fullname: Reynolds, Mark
  organization: Loxo Oncology Inc, South San Francisco, CA, USA
– sequence: 14
  givenname: Steven
  surname: Smith
  fullname: Smith, Steven
  organization: Loxo Oncology Inc, South San Francisco, CA, USA
– sequence: 15
  givenname: Scott
  surname: Cruickshank
  fullname: Cruickshank, Scott
  organization: Loxo Oncology Inc, South San Francisco, CA, USA
– sequence: 16
  givenname: Michael C
  surname: Cox
  fullname: Cox, Michael C
  organization: Loxo Oncology Inc, South San Francisco, CA, USA
– sequence: 17
  givenname: Alberto S
  surname: Pappo
  fullname: Pappo, Alberto S
  organization: St Jude Children's Research Hospital, Memphis, TN, USA
– sequence: 18
  givenname: Douglas S
  surname: Hawkins
  fullname: Hawkins, Douglas S
  organization: Seattle Children's Hospital, University of Washington, Fred Hutchinson Cancer Research Center Seattle, WA, USA
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29606584 - Lancet Oncol. 2018 May;19(5):594-595
29726388 - Lancet Oncol. 2018 May;19(5):e229
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Snippet Gene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib, a highly selective...
Summary Background Gene fusions involving NTRK1, NTRK2, or NTRK3 (TRK fusions) are found in a broad range of paediatric and adult malignancies. Larotrectinib,...
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elsevier
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StartPage 705
SubjectTerms Administration, Oral
Adolescent
Adolescents
Age
Age Factors
Alanine
Alanine transaminase
Anthracycline
Antineoplastic Agents - administration & dosage
Antineoplastic Agents - adverse effects
Aspartate aminotransferase
Biomarkers, Tumor - antagonists & inhibitors
Biomarkers, Tumor - genetics
Cancer therapies
Central nervous system
Chemotherapy
Child
Child, Preschool
Children
Clinical trials
Discoidin Domain Receptor 2 - antagonists & inhibitors
Discoidin Domain Receptor 2 - genetics
Drug Administration Schedule
Female
Fibrosarcoma
Gene Fusion
Humans
Infant
Infants
Kinases
Leukopenia
Male
Membrane Glycoproteins - antagonists & inhibitors
Membrane Glycoproteins - genetics
Metastases
Metastasis
Nausea
Neoplasms - drug therapy
Neoplasms - genetics
Neoplasms - pathology
Neuroblastoma
Neutrophils
Oncology
Papillary thyroid cancer
Patients
Pediatrics
Protein Kinase Inhibitors - administration & dosage
Protein Kinase Inhibitors - adverse effects
Pyrazoles - administration & dosage
Pyrazoles - adverse effects
Pyrimidines - administration & dosage
Pyrimidines - adverse effects
Receptor Protein-Tyrosine Kinases - antagonists & inhibitors
Receptor Protein-Tyrosine Kinases - genetics
Receptor, trkA - antagonists & inhibitors
Receptor, trkA - genetics
Receptor, trkB - antagonists & inhibitors
Receptor, trkB - genetics
Safety
Solid tumors
Surgery
Thyroid cancer
Time Factors
Toxicity
Treatment Outcome
Tumors
United States
Vomiting
Young Adult
Title Larotrectinib for paediatric solid tumours harbouring NTRK gene fusions: phase 1 results from a multicentre, open-label, phase 1/2 study
URI https://www.clinicalkey.com/#!/content/1-s2.0-S1470204518301190
https://dx.doi.org/10.1016/S1470-2045(18)30119-0
https://www.ncbi.nlm.nih.gov/pubmed/29606586
https://www.proquest.com/docview/2030729687
https://www.proquest.com/docview/2020891543
Volume 19
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