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Foster JH, Reid JM, Minard C, Woodfield S, Denic KZ, Isikwei E, Voss SD, Nelson M, Liu X, Berg SL, Fox E, Weigel BJ. Phase 1 study of NEDD8 activating enzyme inhibitor pevonedistat in combination with chemotherapy in pediatric patients with recurrent or refractory solid tumors (ADVL1615). Eur J Cancer 2024; 209:114241. [PMID: 39096851 DOI: 10.1016/j.ejca.2024.114241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 06/24/2024] [Accepted: 07/22/2024] [Indexed: 08/05/2024]
Abstract
PURPOSE The objective of this study was to determine the recommended Phase 2 dose (RP2D) of pevonedistat, a first in class inhibitor of NEDD8 activating enzyme, in combination with irinotecan (IRN) and temozolomide (TMZ) in children with cancer. METHODS This Phase 1 study used a rolling 6 design to evaluate escalating doses of pevonedistat in combination with standard doses of IRN and TMZ in pediatric patients with recurrent/refractory solid or CNS tumors. During cycle 1, pevonedistat was administered intravenously on days 1, 8, 10, and 12, with IRN (IV, 50 mg/m2) and TMZ (orally, 100 mg/m2), on days 8-12 of a 28-day cycle. In subsequent cycles, pevonedistat was administered on days 1, 3, and 5, with IRN/TMZ on days 1-5 of a 21-day cycle. RESULTS Thirty patients enrolled; all were eligible and evaluable for toxicity. Six patients each enrolled on pevonedistat dose levels (DL) 1 (15 mg/m2), 2 (20 mg/m2), 3 (25 mg/m2) and 4 (35 mg/m2) as well as an expanded pharmacokinetic (PK) cohort at DL4. The maximum tolerated dose (MTD) was not exceeded. 2/12 (17 %) patients treated at the RP2D (35 mg/m2) experienced a cycle 1 dose limiting toxicity (DLT). IRN is unlikely to affect the pharmacokinetics of pevonedistat. Two patients had a partial response and 6 patients had prolonged stable disease (> 6 cycles). CONCLUSIONS Pevonedistat in combination with IRN/TMZ is well tolerated in children with solid or CNS tumors. The RP2D of pevonedistat is 35 mg/m2 on days 1, 3, 5 in combination with IRN/TMZ.
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Affiliation(s)
- Jennifer H Foster
- Texas Children's Hospital, Baylor College of Medicine, Dan L Duncan Comprehensive Cancer Center, Houston, TX, USA.
| | | | - Charles Minard
- Institute for Clinical and Translational Research, Baylor College of Medicine, Houston, TX, USA
| | - Sarah Woodfield
- Texas Children's Hospital, Baylor College of Medicine, Dan L Duncan Comprehensive Cancer Center, Houston, TX, USA
| | | | | | - Stephan D Voss
- Department of Radiology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Marvin Nelson
- Children's Hospital Los Angeles, Radiology, Keck USC School of Medicine, Los Angeles, CA, USA
| | - Xiaowei Liu
- Children's Oncology Group, Monrovia, CA, USA
| | - Stacey L Berg
- Texas Children's Hospital, Baylor College of Medicine, Dan L Duncan Comprehensive Cancer Center, Houston, TX, USA
| | - Elizabeth Fox
- Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Brenda J Weigel
- Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA
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2
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Zarrabi A, Perrin D, Kavoosi M, Sommer M, Sezen S, Mehrbod P, Bhushan B, Machaj F, Rosik J, Kawalec P, Afifi S, Bolandi SM, Koleini P, Taheri M, Madrakian T, Łos MJ, Lindsey B, Cakir N, Zarepour A, Hushmandi K, Fallah A, Koc B, Khosravi A, Ahmadi M, Logue S, Orive G, Pecic S, Gordon JW, Ghavami S. Rhabdomyosarcoma: Current Therapy, Challenges, and Future Approaches to Treatment Strategies. Cancers (Basel) 2023; 15:5269. [PMID: 37958442 PMCID: PMC10650215 DOI: 10.3390/cancers15215269] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 10/18/2023] [Accepted: 10/29/2023] [Indexed: 11/15/2023] Open
Abstract
Rhabdomyosarcoma is a rare cancer arising in skeletal muscle that typically impacts children and young adults. It is a worldwide challenge in child health as treatment outcomes for metastatic and recurrent disease still pose a major concern for both basic and clinical scientists. The treatment strategies for rhabdomyosarcoma include multi-agent chemotherapies after surgical resection with or without ionization radiotherapy. In this comprehensive review, we first provide a detailed clinical understanding of rhabdomyosarcoma including its classification and subtypes, diagnosis, and treatment strategies. Later, we focus on chemotherapy strategies for this childhood sarcoma and discuss the impact of three mechanisms that are involved in the chemotherapy response including apoptosis, macro-autophagy, and the unfolded protein response. Finally, we discuss in vivo mouse and zebrafish models and in vitro three-dimensional bioengineering models of rhabdomyosarcoma to screen future therapeutic approaches and promote muscle regeneration.
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Affiliation(s)
- Ali Zarrabi
- Department of Biomedical Engineering, Faculty of Engineering and Natural Sciences, Istinye University, Sariyer, Istanbul 34396, Türkiye; (A.Z.); (A.Z.)
| | - David Perrin
- Section of Orthopaedic Surgery, Department of Surgery, University of Manitoba, Winnipeg, MB R3E 0V9, Canada; (D.P.); (M.S.)
| | - Mahboubeh Kavoosi
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
- Biotechnology Center, Silesian University of Technology, 8 Krzywousty St., 44-100 Gliwice, Poland;
| | - Micah Sommer
- Section of Orthopaedic Surgery, Department of Surgery, University of Manitoba, Winnipeg, MB R3E 0V9, Canada; (D.P.); (M.S.)
- Section of Physical Medicine and Rehabilitation, Department of Internal Medicine, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Serap Sezen
- Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Türkiye; (S.S.); (N.C.); (B.K.)
| | - Parvaneh Mehrbod
- Department of Influenza and Respiratory Viruses, Pasteur Institute of Iran, Tehran 1316943551, Iran;
| | - Bhavya Bhushan
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
- Department of Anatomy and Cell Biology, School of Biomedical Sciences, Faculty of Science, McGill University, Montreal, QC H3A 0C7, Canada
| | - Filip Machaj
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
- Department of Physiology, Pomeranian Medical University, 70-111 Szczecin, Poland
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA
| | - Jakub Rosik
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
- Department of Physiology, Pomeranian Medical University, 70-111 Szczecin, Poland
- Department of Chemistry, University of Chicago, Chicago, IL 60637, USA
| | - Philip Kawalec
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
- Section of Neurosurgery, Department of Surgery, University of Manitoba, Health Sciences Centre, Winnipeg, MB R3A 1R9, Canada
| | - Saba Afifi
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
| | - Seyed Mohammadreza Bolandi
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
| | - Peiman Koleini
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
| | - Mohsen Taheri
- Genetics of Non-Communicable Disease Research Center, Zahedan University of Medical Sciences, Zahedan 9816743463, Iran;
| | - Tayyebeh Madrakian
- Department of Analytical Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan 6517838695, Iran; (T.M.); (M.A.)
| | - Marek J. Łos
- Biotechnology Center, Silesian University of Technology, 8 Krzywousty St., 44-100 Gliwice, Poland;
| | - Benjamin Lindsey
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
| | - Nilufer Cakir
- Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Türkiye; (S.S.); (N.C.); (B.K.)
| | - Atefeh Zarepour
- Department of Biomedical Engineering, Faculty of Engineering and Natural Sciences, Istinye University, Sariyer, Istanbul 34396, Türkiye; (A.Z.); (A.Z.)
| | - Kiavash Hushmandi
- Department of Food Hygiene and Quality Control, Division of Epidemiology, Faculty of Veterinary Medicine, University of Tehran, Tehran 1419963114, Iran;
| | - Ali Fallah
- Integrated Manufacturing Technologies Research and Application Center, Sabanci University, Tuzla, Istanbul 34956, Türkiye;
| | - Bahattin Koc
- Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Türkiye; (S.S.); (N.C.); (B.K.)
- Integrated Manufacturing Technologies Research and Application Center, Sabanci University, Tuzla, Istanbul 34956, Türkiye;
- Sabanci University Nanotechnology Research and Application Center (SUNUM), Tuzla, Istanbul 34956, Türkiye
| | - Arezoo Khosravi
- Department of Genetics and Bioengineering, Faculty of Engineering and Natural Sciences, Istanbul Okan University, Istanbul 34959, Türkiye;
| | - Mazaher Ahmadi
- Department of Analytical Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan 6517838695, Iran; (T.M.); (M.A.)
| | - Susan Logue
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
| | - Gorka Orive
- NanoBioCel Research Group, School of Pharmacy, University of the Basque Country (UPV/EHU), 01007 Vitoria-Gasteiz, Spain;
- University Institute for Regenerative Medicine and Oral Implantology–UIRMI (UPV/EHU-Fundación Eduardo Anitua), 01007 Vitoria-Gasteiz, Spain
- Bioaraba, NanoBioCel Research Group, 01006 Vitoria-Gasteiz, Spain
| | - Stevan Pecic
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, CA 92831, USA;
| | - Joseph W. Gordon
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
- College of Nursing, Rady Faculty of Health Science, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Saeid Ghavami
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (M.K.); (B.B.); (F.M.); (J.R.); (P.K.); (S.A.); (S.M.B.); (P.K.); (B.L.); (S.L.); (J.W.G.)
- Biology of Breathing Theme, Children Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
- Autophagy Research Center, Shiraz University of Medical Sciences, Shiraz 7134845794, Iran
- Academy of Silesia, Faculty of Medicine, Rolna 43, 40-555 Katowice, Poland
- Research Institutes of Oncology and Hematology, Cancer Care Manitoba-University of Manitoba, Winnipeg, MB R3E 0V9, Canada
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Casanova M, Bautista F, Campbell-Hewson Q, Makin G, Marshall LV, Verschuur AC, Cañete Nieto A, Corradini N, Ploeger BA, Brennan BJ, Mueller U, Zebger-Gong H, Chung JW, Geoerger B. Regorafenib plus Vincristine and Irinotecan in Pediatric Patients with Recurrent/Refractory Solid Tumors: An Innovative Therapy for Children with Cancer Study. Clin Cancer Res 2023; 29:4341-4351. [PMID: 37606641 PMCID: PMC10618645 DOI: 10.1158/1078-0432.ccr-23-0257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 05/17/2023] [Accepted: 08/18/2023] [Indexed: 08/23/2023]
Abstract
PURPOSE This phase Ib study defined the safety, MTD, and recommended phase II dose (RP2D) of regorafenib combined with vincristine and irinotecan (VI). Secondary objectives were evaluation of antitumor activity and pharmacokinetics (PK) of regorafenib and irinotecan. PATIENTS AND METHODS Patients aged 6 months to <18 years with relapsed/refractory solid malignancies [≥50% with rhabdomyosarcoma (RMS)] received regorafenib (starting dose 72 mg/m2/day) concomitantly or sequentially with vincristine 1.5 mg/m2 on days 1 and 8, and irinotecan 50 mg/m2 on days 1-5 (21-day cycle). Adverse events (AE) and tumor response were assessed. PK (regorafenib and irinotecan) were evaluated using a population PK model. RESULTS We enrolled 21 patients [median age, 10 years; 12, RMS; 5, Ewing sarcoma (EWS)]. The MTD/RP2D of regorafenib in the sequential schedule was 82 mg/m2. The concomitant dosing schedule was discontinued because of dose-limiting toxicities in 2 of 2 patients treated. Most common grade 3/4 (>30% of patients) AEs were neutropenia, anemia, thrombocytopenia, and leukopenia. The overall response rate was 48% and disease control rate [complete response (CR)/partial response/stable disease/non-CR/non-progressive disease] was 86%. Median progression-free survival was 7.0 months [95% confidence interval (CI), 2.9-14.8] and median overall survival was 8.7 months (95% CI, 5.5-16.3). When combined with VI, regorafenib PK was similar to single-agent PK in children and adults (treated with regorafenib 160 mg/day). CONCLUSIONS Regorafenib can be combined sequentially with standard dose VI in pediatric patients with relapsed/refractory solid tumors with appropriate dose modifications. Clinical activity was observed in patients with RMS and EWS (ClinicalTrials.gov NCT02085148).
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Affiliation(s)
- Michela Casanova
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Francisco Bautista
- Department of Paediatric Oncology, Hospital Infantil Universitario Niño Jesús, Madrid, Spain
| | | | - Guy Makin
- Division of Cancer Sciences, School of Medical Sciences, University of Manchester and Royal Manchester Children's Hospital, Manchester, United Kingdom
| | - Lynley V. Marshall
- Paediatric and Adolescent Oncology Drug Development Team, The Royal Marsden Hospital and The Institute of Cancer Research, London, United Kingdom
| | - Arnauld C. Verschuur
- Department of Pediatric Haematology-Oncology, La Timone Children's Hospital, AP-HM, Marseille, France
| | - Adela Cañete Nieto
- Unidad de Oncología Pediátrica, Hospital Universitario y Politecnico La Fe, Valencia, Spain
| | - Nadège Corradini
- Hematology and Oncology Pediatric Institute, Léon Bérard Center, Lyon, France
| | - Bart A. Ploeger
- Pharmacometrics/Modelling and Simulation, Bayer AG, Berlin, Germany
| | | | - Udo Mueller
- Department of Statistics, ClinStat GmbH, Cologne, Germany
| | - Hong Zebger-Gong
- Medical Affairs and Pharmacovigilance, Bayer AG, Berlin, Germany
| | - John W. Chung
- Clinical Development Oncology, Bayer HealthCare Pharmaceuticals, Whippany, New Jersey
| | - Birgit Geoerger
- Department of Pediatric and Adolescent Oncology, Gustave Roussy Cancer Center, INSERM U1015, Université Paris-Saclay, Villejuif, France
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4
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Zhang L, Lemberg KM, Calizo A, Varadhan R, Siegel AH, Meyer CF, Blakeley JO, Pratilas CA. Analysis of treatment sequence and outcomes in patients with relapsed malignant peripheral nerve sheath tumors. Neurooncol Adv 2023; 5:vdad156. [PMID: 38130899 PMCID: PMC10733661 DOI: 10.1093/noajnl/vdad156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023] Open
Abstract
Background Malignant peripheral nerve sheath tumors (MPNST) are aggressive soft tissue sarcomas originating from cellular components within the nerve sheath. The incidence of MPNST is highest in people with neurofibromatosis type 1 (NF1), and MPNST is the leading cause of death for these individuals. Complete surgical resection is the only curative therapeutic option, but is often unfeasible due to tumor location, size, or presence of metastases. Evidence-based choices of chemotherapy for recurrent/refractory MPNST remain elusive. To address this gap, we conducted a retrospective analysis of our institutional experience in treating patients with relapsed MPNST in order to describe patient outcomes related to salvage regimens. Methods We conducted a retrospective electronic health record analysis of patients with MPNST who were treated at Johns Hopkins Hospital from January 2010 to June 2021. We calculated time to progression (TTP) based on salvage chemotherapy regimens. Results Sixty-five patients were included in the analysis. Upfront therapy included single or combined modalities of surgery, chemotherapy, or radiotherapy. Forty-eight patients received at least 1 line of chemotherapy, which included 23 different regimens (excluding active clinical studies). Most patients (n = 42, 87.5%) received a combination of doxorubicin, ifosfamide, or etoposide as first-line chemotherapy. Salvage chemotherapy regimens and their TTP varied greatly, with irinotecan/temozolomide-based regimens having the longest average TTP (255.5 days, among 4 patients). Conclusions Patients with advanced or metastatic MPNST often succumb to their disease despite multiple lines of therapy. These data may be used as comparative information in decision-making for future patients and clinical trials.
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Affiliation(s)
- Lindy Zhang
- Sidney Kimmel Comprehensive Cancer Center and Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Cellular and Molecular Medicine Graduate Program, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Kathryn M Lemberg
- Sidney Kimmel Comprehensive Cancer Center and Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ana Calizo
- Cellular and Molecular Medicine Graduate Program, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ravi Varadhan
- Sidney Kimmel Comprehensive Cancer Center and Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Alan H Siegel
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Christian F Meyer
- Sidney Kimmel Comprehensive Cancer Center and Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Jaishri O Blakeley
- Sidney Kimmel Comprehensive Cancer Center and Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Neurology and Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Christine A Pratilas
- Sidney Kimmel Comprehensive Cancer Center and Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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5
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Zhu J, Wang J, Sun F, Zhen Z, Chen T, Lu S, Huang J, Zhang Y, Sun X. Vincristine, Irinotecan, and Temozolomide in Patients With Relapsed/Refractory Neuroblastoma. Front Oncol 2022; 12:804310. [PMID: 35359419 PMCID: PMC8961432 DOI: 10.3389/fonc.2022.804310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 02/03/2022] [Indexed: 11/22/2022] Open
Abstract
Purpose The combination of irinotecan, temozolomide and vincristine has been proposed as an effective salvage regimen for some pediatric malignancies. Thus, we sought to evaluate this combination for patients with relapsed and refractory neuroblastoma (NB). Patients and Methods In this retrospective study, forty-six patients with relapsed or refractory NB were treated with the combination of vincristine (1.5 mg/m2 i.v. day 1), irinotecan (50 mg/m2/day i.v. days 1–5) and temozolomide (100 mg/m2/day p.o. days 1–5) (VIT) during the period 2011–2019. All toxicities were documented. Results A total of 251 cycles (median 6 cycles/patient) were administered. A complete response (CR) was achieved in 5 patients, partial response (PR) in 27 patients, stable disease (SD) in 8 patients, and progression disease (PD) in 6 patients, with an overall objective response rate (CR+PR) of 69.6%. Eighteen patients developed diarrhea with Grade 3 or less. Grade 1-2 hematologic toxicity occurred in 10 patients. Grade 3-4 hematologic toxicity developed in 32 patients. VIT was an effective regimen for different metastatic sites. UGT1A*28 genotyping performed in 7 patients revealed wild type. Diarrhea occurred in 4 of them. Conclusion The shorter, 5-day VIT regimen is an active and well-tolerated salvage regimen in relapse/refractory NB.
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Affiliation(s)
- Jia Zhu
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Juan Wang
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Feifei Sun
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Zijun Zhen
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Tingting Chen
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Suying Lu
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Junting Huang
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Yizhuo Zhang
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Xiaofei Sun
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Guangzhou, China.,Department of Pediatric Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
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Tsakatikas S, Papageorgiou G, Fioretzaki R, Kosmas C. An overview of current results with the vincristine-irinotecan-temozolomide combination with or without bevacizumab in pediatric, adolescence and adult solid tumors. Crit Rev Oncol Hematol 2021; 166:103457. [PMID: 34428555 DOI: 10.1016/j.critrevonc.2021.103457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Revised: 01/02/2021] [Accepted: 08/19/2021] [Indexed: 11/29/2022] Open
Abstract
Malignant tumors in young patients present a significant therapeutic challenge for physicians, partially due to their rarity and a relative lack of data, at least compared to adult tumors. As a result, there is an urgent need to explore new possible therapeutic regimens, either by introducing novel agents or by exploring combinations of existing agents. Vincristine, Temozolomide and Irinotecan are chemotherapeutic drugs which have emerged over the last six decades as monotherapy or as part of therapeutic regimens in various solid tumors. Combining these agents can yield strong synergistic effects, as suggested by preclinical data and results from clinical trials. Furthermore, adding novel molecules, such as anti-VEGF factor Bevacizumab to the aforementioned regimens, has shown efficacy in a limited number of trials, which are thoroughly analyzed throughout this review. Data presented throughout this paper suggest that VIT(b) regimen should be further explored in solid tumors in pediatric and adolescent patients.
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Affiliation(s)
- Sergios Tsakatikas
- Department of Medical Oncology & Hematopoietic Cell Transplant Unit, "Metaxa" Memorial Cancer Hospital, 18537, Piraeus, Greece.
| | - George Papageorgiou
- Department of Medical Oncology & Hematopoietic Cell Transplant Unit, "Metaxa" Memorial Cancer Hospital, 18537, Piraeus, Greece.
| | - Rodanthi Fioretzaki
- Department of Medical Oncology & Hematopoietic Cell Transplant Unit, "Metaxa" Memorial Cancer Hospital, 18537, Piraeus, Greece.
| | - Christos Kosmas
- Department of Medical Oncology & Hematopoietic Cell Transplant Unit, "Metaxa" Memorial Cancer Hospital, 18537, Piraeus, Greece.
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7
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Papageorgiou GI, Tsakatikas SA, Fioretzaki RG, Kosmas C. Notable response of a young adult with recurrent glioblastoma multiforme to vincristine-irinotecan-temozolomide and bevacizumab. Anticancer Drugs 2021; 32:330-336. [PMID: 33229903 DOI: 10.1097/cad.0000000000001021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Glioblastoma multiforme is a malignant central nervous system (CNS) disease with dismal prognosis. Current treatment modalities only offer modest activity and usually of short duration, so there is an urgent need for the conduct of clinical trials exploring new treatment options and modalities. The vincristine-irinotecan-temozolomide and bevacizumab (VITb) regimen is an option of special interest, as it has produced encouraging results in young patients with various relapsed/refractory childhood and adolescence solid tumors, with an acceptable toxicity profile. With the current report, we present the case of a young male patient who was treated for GBM in second relapse at out institution, after previous surgical attempts and two radiotherapy sessions in conjunction with temozolomide and experienced a major and long-lasting response, weaned off steroids, to the VITb regimen followed by bevacizumab maintenance. The above case is discussed in the context of the existing literature regarding available evidence of synergy between the drugs used and the activity of certain components of the combination (i.e. combination of temozolomide-irinotecan ± vincristine, or bevacizumab-irinotecan in GBM) or the complete VITb regimen in other pediatric/adolescence solid tumors and the few cases reported with GBM.
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Affiliation(s)
- Georgios I Papageorgiou
- Division of Medical Oncology & Hematopoietic Cell Transplant Unit, Department of Medicine, Metaxa Cancer Hospital, Piraeus, Greece
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8
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Heske CM, Mascarenhas L. Relapsed Rhabdomyosarcoma. J Clin Med 2021; 10:804. [PMID: 33671214 PMCID: PMC7922213 DOI: 10.3390/jcm10040804] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 02/02/2021] [Accepted: 02/13/2021] [Indexed: 12/14/2022] Open
Abstract
Relapsed rhabdomyosarcoma (RMS) represents a significant therapeutic challenge. Nearly one-third of patients diagnosed with localized RMS and over two-thirds of patients with metastatic RMS will experience disease recurrence following primary treatment, generally within three years. Clinical features at diagnosis, including primary site, tumor invasiveness, size, stage, and histology impact likelihood of relapse and prognosis post-relapse. Aspects of initial treatment, including extent of surgical resection, use of radiotherapy, and chemotherapy regimen, are also associated with post-relapse outcomes, as are features of the relapse itself, including time to relapse and extent of disease involvement. Although there is no standard treatment for patients with relapsed RMS, several general principles, including tissue biopsy confirmation of diagnosis, assessment of post-relapse prognosis, determination of the feasibility of additional local control measures, and discussion of patient goals, should all be part of the approach to care. Patients with features suggestive of a favorable prognosis, which include those with botryoid RMS or stage 1 or group I embryonal RMS (ERMS) who have had no prior treatment with cyclophosphamide, have the highest chance of achieving long-term cure when treated with a multiagent chemotherapy regimen at relapse. Unfortunately, patients who do not meet these criteria represent the majority and have poor outcomes when treated with such regimens. For this group, strong consideration should be given for enrollment on a clinical trial.
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Affiliation(s)
- Christine M. Heske
- Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Leo Mascarenhas
- Cancer and Blood Disease Institute, Children’s Hospital Los Angeles, Division of Hematology/Oncology, Department of Pediatrics and Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90027, USA;
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Autophagy modulates temozolomide-induced cell death in alveolar Rhabdomyosarcoma cells. Cell Death Discov 2018; 4:52. [PMID: 30416757 PMCID: PMC6202374 DOI: 10.1038/s41420-018-0115-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 09/20/2018] [Accepted: 09/26/2018] [Indexed: 02/08/2023] Open
Abstract
Rhabdomyosarcoma (RMS) is a muscle-derived tumor. In both pre-clinical and clinical studies Temozolomide (TMZ) has been recently tested against RMS; however, the precise mechanism of action of TMZ in RMS remains unclear. Here we demonstrate that TMZ decreases the cell viability of the RH30 RMS and C2C12 cell line, where cells display evidence of mitochondrial outer membrane permeability. Interestingly, the C2C12 mouse myoblast line was relatively more resistant to TMZ-induced apoptosis. Moreover, we observed that TMZ activated biochemical and morphological markers of autophagy in both cell lines. Autophagy inhibition in both RH30 and C2C12 cells significantly increased TMZ-induced cell death. In RH30 cells, TMZ increased Mcl-1 and Bax protein expression compared to corresponding time match controls while in C2C12 Mcl-1, Bcl-2, Bcl-XL, and Bax protein expression were not changed. Baf-A1 co-treatment with TMZ significantly decrease Mcl-1 expression compared to TMZ while increase Bax expression in C2C12 cells (Bcl2 and Bcl-XL do not significantly change in Baf-A1/TMZ co-treatment). Using a three-dimensional (3D) C2C12 and RH30 culture model we demonstrated that TMZ is significantly more toxic in RH30 cells (live/dead assay). Additionally, we have observed in our 3D culture model that TMZ induced both apoptosis (cleavage of PARP) and autophagy (LC3-puncta and localization of LC3/p62). Therefore, our data demonstrate that TMZ induces simultaneous autophagy and apoptosis in both RH30 and C2C12 cells in 2D and 3D culture model, where RH30 cells are more sensitive to TMZ-induced death. Furthermore, autophagy serves to protect RH30 cells from TMZ-induced death.
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10
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Wolff DW, Lee MH, Jothi M, Mal M, Li F, Mal AK. Camptothecin exhibits topoisomerase1-independent KMT1A suppression and myogenic differentiation in alveolar rhabdomyosarcoma cells. Oncotarget 2018; 9:25796-25807. [PMID: 29899822 PMCID: PMC5995248 DOI: 10.18632/oncotarget.25376] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 04/24/2018] [Indexed: 01/01/2023] Open
Abstract
Alveolar rhabdomyosarcoma (aRMS) is an aggressive subtype of the most common soft tissue cancer in children. A hallmark of aRMS tumors is incomplete myogenic differentiation despite expression of master myogenic regulators such as MyoD. We previously reported that histone methyltransferase KMT1A suppresses MyoD function to maintain an undifferentiated state in aRMS cells, and that loss of KMT1A is sufficient to induce differentiation and suppress malignant phenotypes in these cells. Here, we develop a chemical compound screening approach using MyoD-responsive luciferase reporter myoblast cells to identify compounds that alleviate suppression of MyoD-mediated differentiation by KMT1A. A screen of pharmacological compounds yielded the topoisomerase I (TOP1) poison camptothecin (CPT) as the strongest hit in our assay system. Furthermore, treatment of aRMS cells with clinically relevant CPT derivative irinotecan restores MyoD function, and myogenic differentiation in vitro and in a xenograft model. This differentiated phenotype was associated with downregulation of the KMT1A protein. Remarkably, loss of KMT1A in CPT-treated cells occurs independently of its well-known anti-TOP1 mechanism. We further demonstrate that CPT can directly inhibit KMT1A activity in vitro. Collectively, these findings uncover a novel function of CPT that downregulates KMT1A independently of CPT-mediated TOP1 inhibition and permits differentiation of aRMS cells.
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Affiliation(s)
- David W. Wolff
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Min-Hyung Lee
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
- Current address: Division of Biotechnology Review and Research IV, Office of Biotechnology Products, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Mathivanan Jothi
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
- Current address: Department of Human Genetics, National Institute of Mental Health and Neurosciences, Bengaluru, KA 560029, India
| | - Munmun Mal
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Fengzhi Li
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Asoke K. Mal
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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11
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Abstract
PURPOSE OF REVIEW Three primary categories of gynecologic cancer are found in pediatric and adolescent patients: stromal carcinomas including juvenile granulosa cell tumors and Sertoli-Leydig cell tumors, rhabdomyosarcomas arising from the vagina and cervix (sarcoma botryoides), and ovarian germ cell tumors which comprise a wide range of histologies. These entities are rare and treatment approaches have focused on decreasing late effects of chemotherapy treatment. Here, we review presentation, histologic classifications, diagnosis, and treatment recommendations for pediatric gynecologic cancers. RECENT FINDINGS Event-free and overall survival for these cancers is high, and the goals of treatment are minimization of morbidity and preservation of fertility with unilateral salpingo-oophorectomies and limited staging. Surveillance of tumor markers after surgery is helpful in monitoring for disease progression and adjuvant chemotherapy is often reserved for patients at recurrence. Recent literature supports avoiding chemotherapy even in high-grade germ cell tumors in the pediatric population.
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Setty BA, Stanek JR, Mascarenhas L, Miller A, Bagatell R, Okcu F, Nicholls L, Lysecki D, Gupta AA. VIncristine, irinotecan, and temozolomide in children and adolescents with relapsed rhabdomyosarcoma. Pediatr Blood Cancer 2018; 65:10.1002/pbc.26728. [PMID: 28748602 PMCID: PMC7497851 DOI: 10.1002/pbc.26728] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 06/06/2017] [Accepted: 06/20/2017] [Indexed: 11/11/2022]
Abstract
BACKGROUND The combination of vincristine, irinotecan, and temozolomide (VIT) is often used to treat children and adolescents with relapsed rhabdomyosarcoma (RMS); however, the outcome of these patients has not been previously described. PROCEDURES We sought to determine the response rate (RR) and progression-free survival (PFS) for patients with relapsed RMS treated with VIT by retrospective review of patients treated at five tertiary care hospitals. Prior treatment with irinotecan was permitted. RESULTS Among 19 patients with a median age of 8 years (range 2-17 years), 12 (63%) were males and 12 (63%) had embryonal histology. Median time to relapse from initial diagnosis was 16 months (range 2.8-45 months). VIT was used as first, second, third, or fourth line of therapy in four (21%), seven (37%), six (32%), and two (10%) patients, respectively. Four patients received VIT as adjuvant therapy following radiation and/or surgery. Therefore, among 15 evaluable patients, the best response to VIT was 0 (complete response, CR), 0 (partial response, PR), 4 (stable disease, SD), and 11 (progressive disease, PD) for an overall clinical benefit rate (CR + PR + SD) of 26.7% (95% CI: 7.8-55.1%). After a median follow-up of 8 months, 2 (10%) patients were alive without disease, 3 (16%) were alive with disease, and 14 (74%) patients died of PD. PFS at 3 months was 23% (95% CI: 5.7-46.7%). CONCLUSIONS VIT therapy in combination with adequate local control is associated with some disease control in patients with first relapse RMS and may be another reasonable option to offer patients as salvage therapy.
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Affiliation(s)
- Bhuvana A Setty
- Division of Hematology/Oncology/BMT, Nationwide Children's Hospital, Columbus, Ohio
| | - Joseph R Stanek
- Division of Hematology/Oncology/BMT, Nationwide Children's Hospital, Columbus, Ohio
| | - Leo Mascarenhas
- Division of Hematology, Oncology and Blood and Marrow Transplantation, Department of Pediatrics, Children's Hospital Los Angeles, Los Angeles, California
- Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Alexandra Miller
- Department of Pediatrics, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Rochelle Bagatell
- Department of Pediatrics, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Fatih Okcu
- Division of Pediatrics, University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Lauren Nicholls
- Division of Pediatrics, University of Texas MD Anderson Cancer Center, Houston, Texas
| | - David Lysecki
- Division of Pediatrics, McMaster Children's Hospital, Hamilton, Ontario, Canada
| | - Abha A Gupta
- Department of Hematology/Oncology, Hospital for Sick Children, Toronto, Ontario, Canada
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Sertoli-Leydig Cell Tumor with Concurrent Rhabdomyosarcoma: Three Case Reports and a Review of the Literature. Case Rep Med 2017; 2017:4587296. [PMID: 28751916 PMCID: PMC5511678 DOI: 10.1155/2017/4587296] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 05/19/2017] [Accepted: 05/29/2017] [Indexed: 12/24/2022] Open
Abstract
Sertoli-Leydig Cell Tumors (SLCTs) make up <1% of all ovarian tumors and are benign or malignant, androgen-secreting tumors. Rhabdomyosarcoma (RMS) is a heterogeneous group of malignant tumors that resemble developing skeletal muscle. There have been case reports of patients with concurrent SLCT and RMS with limited treatment options. We aim to demonstrate treatment strategies used in our patients, which seemed to have prolonged survival when compared to prior case reports of patients not cured by surgical resection. Herein we describe 22 cases of SLCT with RMS elements as discussed in prior case reports and three cases from the authors' institution. Of the 19 cases from prior case reports, five were lost to follow-up and two had NED after surgical intervention. Eleven patients had recurrence and were deceased within one year. Of those patients not surgically cured, only three patients were documented as living beyond two years, all of whom received chemotherapy. The three patients presented from our institution had clinical evidence of response to chemotherapy that is traditionally used for RMS. In conclusion, chemotherapy with doxorubicin and ifosfamide has activity in patients with SLCT and RMS as does salvage chemotherapy with vincristine, irinotecan, and temozolomide.
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Ruiz-Mesa C, Goldberg JM, Coronado Munoz AJ, Dumont SN, Trent JC. Rhabdomyosarcoma in adults: new perspectives on therapy. Curr Treat Options Oncol 2016; 16:27. [PMID: 25975442 DOI: 10.1007/s11864-015-0342-8] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
OPINION STATEMENT Rhabdomyosarcoma (RMS) is well known as a pediatric disease. Most of the knowledge, like biology, genetics, and treatments of this disease, comes from studies done in that age group. The two subtypes of RMS, embryonic RMS and alveolar RMS, that affect mainly the pediatric population are well described in the literature and that has had an impact on the improvement in overall survival during the past 20 years. RMS in the adult population has a low incidence, therefor the study of RMS in this group is challenging. Pleomorphic RMS is the subtype that mainly affects adults and its biology and genetics are not yet completely understood and described. The risk factors for this tumor and the differences among adults and children is also poorly understood. The treatments for adults that have RMS are not standardized having an impact on the overall survival. Pleomorphic RMS has, compared to other adult sarcomas, poor overall survival. Adult patients with RMS have poor prognosis. The standardization of treatments for the adult population is necessary as maybe new treatments for this specific group. There are new treatment options that are being studied mostly in pediatrics and young adults. Immunotherapy is currently proposed as an important treatment possibility including different techniques like vaccination, antigen-mediated therapy, and immune checkpoints. Even if we have a better understanding of RMS, there are still unanswered questions. The improvements seen in the pediatric population are encouraging, but there is still the need to enhance better therapies for adults with RMS.
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Affiliation(s)
- Catalina Ruiz-Mesa
- Department of Pediatrics, University of Miami/Holtz Children's Hospital at Jackson Health System, 1611 NW 12th Ave, Holtz Hospital 6th floor, Miami, FL, 33136, USA,
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Wagner LM. Fifteen years of irinotecan therapy for pediatric sarcoma: where to next? Clin Sarcoma Res 2015; 5:20. [PMID: 26322224 PMCID: PMC4552408 DOI: 10.1186/s13569-015-0035-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 08/22/2015] [Indexed: 12/31/2022] Open
Abstract
Over the past 15 years, irinotecan has emerged as an important agent for treating pediatric sarcoma patients. This review summarizes the activity noted in previous studies, and outlines current issues regarding scheduling, route of administration, and amelioration of side effects. Also discussed are new pegylated and nanoliposomal formulations of irinotecan and its active metabolite, SN-38, as well as future plans for how irinotecan may be used in combination with other conventional cytotoxic as well as targeted agents.
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Affiliation(s)
- Lars M Wagner
- Division of Pediatric Hematology/Oncology, Kentucky Clinic Suite, University of Kentucky, J-457, Lexington, KY 40536 USA
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Phase I dose escalation and pharmacokinetic study of oral gefitinib and irinotecan in children with refractory solid tumors. Cancer Chemother Pharmacol 2014; 74:1191-8. [PMID: 25257509 DOI: 10.1007/s00280-014-2593-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 09/11/2014] [Indexed: 12/23/2022]
Abstract
PURPOSE This phase I study endeavored to estimate the maximum tolerated dose and describe the dose-limiting toxicities (DLTs) of oral irinotecan with gefitinib in children with refractory solid tumors. METHODS Oral irinotecan was administered on days 1-5 and 8-12 with oral gefitinib (fixed dose, 150 mg/m(2)/day) on days 1-12 of a 21-day course. The escalation with overdose control method guided irinotecan dose escalation (7 dose levels, range 5-40 mg/m(2)/day). RESULTS Sixteen of 19 patients were evaluable, with serial pharmacokinetic studies in ten patients. Diagnoses included osteosarcoma (N = 5), neuroblastoma (N = 3), sarcoma (N = 3), and others (N = 5). Patients received a median of two courses (range 1-20), with at least two patients treated on dose levels 2-7. Three patients had five DLTs; the most common being metabolic (hypokalemia, N = 2 and hypophosphatemia, N = 1) at dose levels two (10 mg/m(2)) and four (20 mg/m(2)). One patient experienced grade 3 diarrhea (40 mg/m(2)). Irinotecan bioavailability was 2.5-fold higher when co-administered with gefitinib, while the conversion rate of irinotecan to SN-38 lactone was unaffected. The study closed due to poor accrual before evaluation of the next recommended irinotecan dose level (35 mg/m(2)). Of 11 patients receiving at least two courses of therapy, three had stable disease lasting two to four courses and one patient maintained a complete response through 18 courses. CONCLUSIONS The combination of oral gefitinib and irinotecan has acceptable toxicity and anti-tumor activity in pediatric patients with refractory solid tumors. Pharmacokinetic analysis confirms that co-administration of gefitinib increases irinotecan bioavailability leading to an increased SN-38 lactone systemic exposure.
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