O6-benzylguanine Followed by Surgery in Treating Patients With Solid Tumors That Can Be Removed During Surgery

Determination of Optimal O6-Benzylguanine Dose to Achieve O6-Alkylguanine-DNA Alkyltransferase Depletion in Patients With Surgically Resectable Solid Tumors

Status

Completed

Phases

Phase 1

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT00003766

Enrollment

Registered

2004-02-20

Start date

1999-10-31

Completion date

2001-11-30

Last updated

2014-03-06

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Unspecified Adult Solid Tumor, Protocol Specific

Keywords

unspecified adult solid tumor, protocol specific

Brief summary

RATIONALE: Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Giving a chemotherapy drug before surgery may shrink the tumor so that it can be removed during surgery. PURPOSE: Phase II trial to study the effectiveness of O6-benzylguanine followed by surgery in treating patients who have solid tumors that can be removed during surgery.

Detailed description

OBJECTIVES: I. Determine the minimal O6-benzylguanine (O6-BG) dose required to deplete tumor activity to less than 10 fmol/mg protein at a specified time after administration in patients with surgically resectable solid tumors. II. Correlate tumor tissue AGT depletion with AGT depletion in peripheral blood mononuclear cells (PBMC) obtained at a specified time after O6-BG administration in these patients. OUTLINE: This is a dose escalation study. Patients receive a single dose of O6-benzylguanine (O6-BG) IV over 1 hour at one of two dose levels. Patients undergo surgery 16-20 hours after administration of O6-BG. Up to 13 patients receive the lower dose level of O6-BG. If more than 3 patients have detectable AGT levels, additional patients receive the higher dose. The optimal biologic dose (OBD) is defined as the lowest dose level at which at least 11 of 13 patients have AGT activity less than 10 fmol/mg protein after O6-BG dosing. Patients are followed at 1 and 3 weeks post surgery. PROJECTED ACCRUAL: A total of 13-26 patients will be accrued for this study over approximately 10 months.

Interventions

DRUGO6-benzylguanine

Study design

Allocation

Intervention model

SINGLE_GROUP

Primary purpose

TREATMENT

Masking

NONE

Eligibility

Sex/Gender

ALL

Healthy volunteers

Inclusion criteria

DISEASE CHARACTERISTICS: Histologically or cytologically confirmed surgically resectable solid tumor PATIENT CHARACTERISTICS: Age: Not specified Performance status: CALGB 0-2 Life expectancy: Not specified Hematopoietic: Not specified Hepatic: Bilirubin no greater than 1.5 times upper limit of normal (ULN) Renal: Creatinine no greater than 1.5 times ULN Other: Not pregnant or nursing Medically cleared for surgery No active medical or psychiatric disease that would prevent compliance PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: No prior chemotherapy Endocrine therapy: Not specified Radiotherapy: No prior radiotherapy Surgery: Not specified

Design outcomes

Primary

Measure	Time frame	Description
Determine minimal dose	2 years	Determine minimal dose of 06-benzylguanine (06-BG) at which there is a depletion of tumor 06-BG DNA alkyltransferase activity to \<10 fmol/mg protein

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026