Drugs / O6-benzylguanine
last change Jan 2023 re-read 9 days ago

O6-benzylguanine

Small molecule targets AGT via inhibition

Developed for
central nervous system neoplasm · cancer of unknown primary site · gliosarcoma · mycosis fungoides and variants · primary cutaneous T-cell non-Hodgkin lymphoma · sarcoma · astrocytoma (excluding glioblastoma) · benign meningioma
+35 more · brain cancer · brain neoplasm · childhood brain stem glioma · childhood central nervous system germ cell tumor · childhood cerebellar astrocytic neoplasm · childhood cerebral astrocytoma · childhood choroid plexus neoplasm · childhood germ cell tumor · childhood malignant neoplasm · childhood medulloblastoma · childhood oligodendroglioma · colorectal cancer · craniopharyngioma · cutaneous melanoma · ependymoblastoma · extragonadal germ cell tumor · grade II meningioma · grade III meningioma · kidney cancer · liver cancer · lymphoma · medulloepithelioma · mixed glioma · neuroblastoma · oligoastrocytoma · oligodendroglioma · optic pathway glioma · ovarian cancer · pediatric infratentorial ependymoma · pediatric supratentorial ependymoma · pineoblastoma · plasma cell myeloma · subependymal giant cell astrocytoma · supratentorial primitive neuroectodermal tumor · glioblastoma
Investigated by
National Cancer Institute (NCI) · Duke University · Case Comprehensive Cancer Center · Fred Hutchinson Cancer Center · Keryx / AOI Pharmaceuticals, Inc. · University of Chicago
+6 more · Children's Hospital Medical Center, Cincinnati · Leland Metheny · Pediatric Brain Tumor Consortium · SWOG Cancer Research Network · Schering-Plough · Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins

Trials 29

PhaseRegistry idDatesIndicationSponsorStatusOutcome
Phase 113 trials
Phase 1 NCT00612989 Feb 2005 → Aug 2007 gliosarcoma Duke University Completed No outcome recorded
Phase 1 NCT00086970 Jun 2004 → Nov 2005 cancer of unknown primary site National Cancer Institute (NCI) Terminated No outcome recorded
Phase 1 NCT00045721 Mar 2003 → Jul 2004 central nervous system neoplasm Pediatric Brain Tumor Consortium Terminated No outcome recorded Stop: Enrollment
Phase 1 NCT00052780 Oct 2002 → Nov 2007 benign meningioma, childhood brain stem glioma, childhood central nervous system germ cell tumor, childhood cerebellar astrocytic neoplasm +16 National Cancer Institute (NCI) Completed No outcome recorded
Phase 1 NCT00006474 Mar 2001 → Aug 2004 central nervous system neoplasm Duke University Completed No outcome recorded
Phase 1 NCT00020150 Jun 2000 → ? central nervous system neoplasm, childhood germ cell tumor, childhood malignant neoplasm, extragonadal germ cell tumor +5 National Cancer Institute (NCI) Completed No outcome recorded
Phase 1 NCT00004892 Apr 2000 → ? central nervous system neoplasm National Cancer Institute (NCI) Completed No outcome recorded
Phase 1 NCT00003766 Oct 1999 → Nov 2001 cancer of unknown primary site University of Chicago Completed No outcome recorded
Phase 1 NCT00003567 May 1999 → Jan 2007 cancer of unknown primary site, central nervous system neoplasm, lymphoma Case Comprehensive Cancer Center Terminated No outcome recorded Stop: Enrollment
Phase 1 NCT00003765 May 1999 → Mar 2006 central nervous system neoplasm National Cancer Institute (NCI) Completed No outcome recorded
Phase 1/22 trials
Phase 1/2 NCT00961220 Feb 2010 → Apr 2012 mycosis fungoides and variants, primary cutaneous T-cell non-Hodgkin lymphoma National Cancer Institute (NCI) Completed No outcome recorded
Phase 1/2 NCT00669669 Feb 2009 → Jul 2018 gliosarcoma Fred Hutchinson Cancer Center Terminated No outcome recorded Stop: Business
Phase 211 trials
Phase 2 NCT05052957 Jan 2023 → Nov 2026 expected adult glioblastoma, gliosarcoma Leland Metheny Recruiting No outcome recorded
Phase 2 NCT00436436 Nov 2006 → Mar 2010 central nervous system neoplasm National Cancer Institute (NCI) Terminated No outcome recorded Stop: Enrollment
Phase 2 NCT00389090 Oct 2006 → Jun 2008 astrocytoma (excluding glioblastoma), oligoastrocytoma, oligodendroglioma Keryx / AOI Pharmaceuticals, Inc. Terminated No outcome recorded
Phase 2 NCT00275002 Feb 2006 → Dec 2010 central nervous system neoplasm National Cancer Institute (NCI) Completed No outcome recorded
Phase 2 NCT00362921 Apr 2004 → Aug 2007 brain neoplasm Duke University Completed No outcome recorded
Phase 2 NCT00005081 Aug 2000 → Apr 2001 central nervous system neoplasm Duke University Completed No outcome recorded
Phase 2 NCT00005066 Jun 2000 → Sep 2001 sarcoma University of Chicago Completed No outcome recorded
Phase 2 NCT00005981 Jun 2000 → Nov 2003 colorectal cancer Case Comprehensive Cancer Center Completed No outcome recorded
Phase 2 NCT00005961 Jun 2000 → Dec 2005 cutaneous melanoma National Cancer Institute (NCI) Completed No outcome recorded
Phase 2 NCT00004072 Sep 1999 → Aug 2004 plasma cell myeloma Case Comprehensive Cancer Center Completed No outcome recorded
Phase 31 trial · 1 missed
Phase 3 NCT00017147 Sep 2001 → May 2006 brain cancer SWOG Cancer Research Network Completed Missed primary
Phase not applicable2 trials
— NCT01769911 Feb 2015 → Feb 2019 Burkitt lymphoma, Hodgkins lymphoma, MALT lymphoma, T-cell large granular lymphocyte leukemia +20 Fred Hutchinson Cancer Center Withdrawn No outcome recorded
— NCT00253487 Aug 2005 → Aug 2012 central nervous system neoplasm Children's Hospital Medical Center, Cincinnati Completed No outcome recorded
Comparator or background therapy4 trials
Phase 1 NCT02343666 Background Aug 2016 → Aug 2020 HIV infectious disease, Hodgkins lymphoma, non-Hodgkin lymphoma Fred Hutchinson Cancer Center Withdrawn No outcome recorded Stop: Enrollment
Phase 1 NCT01269424 Comparator Nov 2011 → Dec 2020 glioblastoma Stanton Gerson MD Completed No outcome recorded
Phase 1 NCT00003348 Background May 1998 → Aug 2000 central nervous system neoplasm Duke University Completed No outcome recorded
Phase 2 NCT00613093 Comparator Oct 2002 → Mar 2006 glioblastoma Duke University Completed No outcome recorded

Evidence & citations 10 cited values

Every value below carries the sentence it was read from. 40 sources stand behind the page.

FieldValueCited text
Known as O(6)-benzylguanine “O(6)-benzylguanine (O(6)-BG), an inhibitor of host alkylation repair, and BCNU were studied in children with refractory/untreatable central nervous system tumors to determine...” PMID 17941066 ↗ Mar 2008
37

“At registration, patients were randomized to Arm 1, which consisted of therapy with O(6)-benzylguanine (O(6)-BG) + BCNU 40 mg/m(2) (reduced dose) + radiation therapy (RT) (O6BG...” PMID 25407559 ↗ Nov 2014

“Temozolomide pharmacokinetics were evaluated in children receiving concurrent O(6)-benzylguanine (O(6)BG), which enhanced the hematological toxicity of temozolomide.” PMID 19430790 ↗ May 2009

“O(6)-Benzylguanine and Temozolomide in Treating Patients With Glioblastoma Multiforme That Did Not Respond to Previous Temozolomide and Radiation Therapy” NCT00436436 ↗

“PURPOSE: Phase I trial to study the effectiveness of O(6)-benzylguanine given before surgery to patients who have malignant glioma.” NCT00002971 ↗

NCT00005081 ↗

NCT00086970 ↗

NCT00253487 ↗

NCT00961220 ↗

NCT00005981 ↗

NCT00275002 ↗

Show 27 more sources

Known as NSC 637037 “Mutant MGMT Gene Transfer Into Human Hematopoietic Progenitors to Protect Hematopoiesis During O6-Benzylguanine (BG, NSC 637037) and Carmustine Followed by Temozolomide Therapy...” NCT00003567 ↗
1

“A Phase II Trial of O6-Benzylguanine (NSC 637037) and BCNU (Carmustine) in Patients With Metatstatic Melanoma” NCT00005961 ↗

Known as O-Benzylguanine “A Phase 2 Study of O-Benzylguanine (O-BG) and Temozolomide in Patients With Glioblastoma Progressing at Least 3 Months After Completion of Primary Treatment With Radiation...” NCT00436436 ↗
Known as O-BG “A Phase 2 Study of O-Benzylguanine (O-BG) and Temozolomide in Patients With Glioblastoma Progressing at Least 3 Months After Completion of Primary Treatment With Radiation...” NCT00436436 ↗
Known as O6-Benzylguanine - O6-BG “O6-Benzylguanine - O6-BG” NCT00613093 ↗
Known as O6-BG “PURPOSE: This phase II trial was designed to define the efficacy of Gliadel wafers in combination with an infusion of O6-benzylguanine (O6-BG) that suppresses tumor...” PMID 19188181 ↗ Feb 2009
10

“PURPOSE: This pediatric phase I trial of O6-benzylguanine (O6BG) and temozolomide (TMZ) on a daily schedule for 5 days, every 28 days was performed to determine the...” PMID 16234526 ↗ Oct 2005

“This phase I clinical trial conducted with patients who had recurrent or progressive malignant glioma (MG) was designed to determine the maximum tolerated dose (MTD) and...” PMID 19289491 ↗ Mar 2009

“O(6)-benzylguanine (O(6)-BG), an inhibitor of host alkylation repair, and BCNU were studied in children with refractory/untreatable central nervous system tumors to determine...” PMID 17941066 ↗ Mar 2008

“Determine the dose of O6-benzylguanine (O6-BG) that produces total depletion of tumor O6-alkylguanine-DNA alkyltransferase (AGT) levels in more than 90% of patients with...” NCT00002971 ↗

“To determine the cutaneous T-cell Lymphoma (CTCL) response rate and safety of O6BG (O6-benzylguanine) /BCNU (carmustine) when given biweekly as two consecutive daily doses.” NCT00961220 ↗

“Temozolomide pharmacokinetics were evaluated in children receiving concurrent O(6)-benzylguanine (O(6)BG), which enhanced the hematological toxicity of temozolomide.” PMID 19430790 ↗ May 2009

“This phase I trial was designed to (1) establish the dose of O6-benzylguanine (O6-BG) administered intravenously as a continuous infusion” PMID 17264335 ↗ Feb 2007

“Patients receive O6-benzylguanine (O6-BG) IV over 1 hour followed 30 minutes later by oral temozolomide daily for 5 days.” NCT00020150 ↗

“Patients receive O(6)-benzylguanine (O6-BG) IV over 1 hour immediately followed by O6-BG IV continuously for 9 days.” NCT00045721 ↗

“Patients receive a single dose of O6-benzylguanine (O6-BG) IV over 1 hour at one of two dose levels.” NCT00003766 ↗

Action Inhibit “baseline O6-alkylguanine DNA alkyltransferase (AGT) activity in circulating peripheral blood mononuclear cells decreases by greater than 90% at 2 hours after BG infusion.” NCT00002604 ↗
Modality Small molecule “low molecular-weight purine analog” NCT05052957 ↗
Route Intravenous “Patients receive BG IV over 1 hour during week 1” NCT00002604 ↗
Target AGT “Correlate tumor tissue AGT depletion with AGT depletion in peripheral blood mononuclear cells (PBMC) obtained at a specified time after O6-BG administration” NCT00003766 ↗