Broccoli Sprout/Broccoli Seed Extract Supplement in Decreasing Toxicity in Heavy Smokers

Early Phase 1

Completed

• Conditions: Cigarette Smoking-Related Carcinoma; Tobacco-Related Carcinoma
• Interventions: Drug: Broccoli Sprout/Broccoli Seed Extract Supplement; Other: Laboratory Biomarker Analysis; Other: Questionnaire Administration

• Registration Number: NCT03402230
• Lead Sponsor: National Cancer Institute (NCI)

Brief Summary

This randomized early phase I trial studies how well broccoli sprout/broccoli seed extract supplement works in decreasing toxicity in heavy smokers. Broccoli sprout/broccoli seed extract supplement is a dietary supplement made from broccoli sprout and seed extract powder, and may break down some of the cancer causing substances in tobacco smoke and produce substances that may protect cells from tobacco smoke-induced damage in current smokers.

Detailed Description

PRIMARY OBJECTIVES:

I. To determine whether broccoli sprout/broccoli seed extract supplement (Avmacol) increases the urinary excretion of the mercapturic acid of the tobacco carcinogen, benzene, in healthy volunteers who are current heavy smokers.

SECONDARY OBJECTIVES:

I. To determine whether Avmacol increases the urinary excretion of the mercapturic acids of other tobacco carcinogens, including acrolein and crotonaldehyde.

II. To determine whether Avmacol increases the urinary excretion of the mercapturic acids of tobacco carcinogens, normalized by bio-measurement of tobacco exposure.

III. To determine whether Avmacol upregulates the NRF2 target gene transcripts in the buccal cells of current smokers.

IV. To evaluate for a dose-response relationship between Avmacol and the detoxification of tobacco carcinogens and the expression of NRF2 target gene transcripts.

V. To determine the relationship between systemic study agent exposure and biomarker modulation.

EXPLORATORY OBJECTIVES:

I. To determine whether the GSTM1 and GSTT1 genotypes are important genetic modulators of detoxification of tobacco carcinogens with Avmacol treatment.

II. To bank specimens for future research including evaluation of tobacco gene signatures in buccal and nasal epithelium and buccal cell nuclear morphometry.

OUTLINE: Participants are randomized into 1 of 2 arms.

ARM I: Participants receive lower dose broccoli sprout/broccoli seed extract supplement orally (PO) daily for 10-14 days. After 10-14 days, participants receive higher dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days.

ARM II: Participants receive higher dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days. After 10-14 days, participants receive lower dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days.

After completion of study, participants are followed up at 10-14 days.

Study Timeline

• Study First Submitted: 2018-01-17
• Study First Submitted QC: 2018-01-17
• Study First Posted: 2018-01-18
• Study Start: 2018-02-20
• Primary Completion: 2020-01-10
• Results First Submitted: 2021-02-02
• Results First Submitted QC: 2021-03-31
• Results First Posted: 2021-04-30
• Study Completion: 2022-07-24
• Status Verified: 2023-06
• Last Update Submitted: 2023-06-02
• Last Update Posted: 2023-06-28

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 49

Inclusion Criteria

• Current tobacco smokers with >= 20 pack years of self-reported smoking exposure and a current average use of >= 10 cigarettes/day
• Karnofsky performance scale >= 70%
• Leukocytes >= 3,000/microliter
• Absolute neutrophil count >= 1,500/microliter
• Platelets >= 100,000/microliter
• Total bilirubin =< 2 x institutional upper limit of normal (ULN)
• Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =< 1.5 x ULN
• Creatinine =< ULN
• Fertile subjects must use adequate contraception (abstinence, barrier methods, or birth control pills) prior to study entry and for the duration of study participation; women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her study physician immediately
• Ability to understand and the willingness to sign a written informed consent document

Exclusion Criteria

• History of invasive cancer within the past 2 years, with the exception of excised and cured non-melanoma skin cancer or carcinoma in situ of the cervix
• Chronic, current or recent (within the past 2 weeks) use of systemic steroid doses equivalent to prednisone > 5 mg daily for continued use > 14 days; use of inhaled steroids, nasal sprays, and topical creams for small body areas is allowed
• Participants may not be receiving any other investigational agents
• History of allergic reactions attributed to compounds of similar chemical or biologic composition to Avmacol
• Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements
• Pregnant or lactating women

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Arm I (Avmacol lower dose, Avmacol higher dose)	Broccoli Sprout/Broccoli Seed Extract Supplement	Participants receive lower dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days. After 10-14 days, participants receive higher dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days.
Arm I (Avmacol lower dose, Avmacol higher dose)	Laboratory Biomarker Analysis	Participants receive lower dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days. After 10-14 days, participants receive higher dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days.
Arm II (Avmacol higher dose, Avmacol lower dose)	Laboratory Biomarker Analysis	Participants receive higher dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days. After 10-14 days, participants receive lower dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days.
Arm II (Avmacol higher dose, Avmacol lower dose)	Questionnaire Administration	Participants receive higher dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days. After 10-14 days, participants receive lower dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days.
Arm I (Avmacol lower dose, Avmacol higher dose)	Questionnaire Administration	Participants receive lower dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days. After 10-14 days, participants receive higher dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days.
Arm II (Avmacol higher dose, Avmacol lower dose)	Broccoli Sprout/Broccoli Seed Extract Supplement	Participants receive higher dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days. After 10-14 days, participants receive lower dose broccoli sprout/broccoli seed extract supplement PO daily for 10-14 days.

Primary Outcome Measures

Name	Time	Method
Change in Urinary Excretion of the Mercapturic Acid of Benzene Following 4 Tablets Per Day of Avmacol	Baseline up to 14 days post intervention	Change in the overnight urinary excretion the mercapturic acid of benzene following 4 tablets per day of Avmacol. Data presented as ratio of the geometric mean of overnight urinary excretion the mercapturic acid of benzene between post intervention and baseline.
Change in Urinary Excretion of the Mercapturic Acid of Benzene Following 8 Tablets Per Day of Avmacol	Baseline up to 14 days post intervention	Change in the overnight urinary excretion the mercapturic acid of benzene following 8 tablets per day of Avmacol. Data presented as ratio of the geometric mean of overnight urinary excretion the mercapturic acid of benzene between post intervention and baseline.

Secondary Outcome Measures

Name	Time	Method
Change in the Urinary Excretion of the Mercapturic Acids of Acrolein and Crotonaldehyde	Baseline up to 14 days post intervention	Change following 4 tablets per day and 8 tablets per day of Avmacol wad determined separately. Data presented as ratio of the geometric mean of overnight urinary excretion of the mercapturic acid of acrolein/crotonaldehyde between post intervention and baseline.
Dose-response Relationship Between Avmacol Dose and Detoxification of Tobacco Carcinogens	Up to 14 days post intervention	Dose-response relationship between the Avmacol dose and the detoxification of tobacco carcinogens. Data presented as ratio of percent change of the overnight urinary excretion of mercapturic acid of benzene/acrolein/crotonaldehyde between the 8 tables and 4 tables dose.
Systemic Study Agent Exposure	Up to 14 days post intervention	Change in the total urinary levels of sulforaphane and its glutathione-derived metabolites (i.e., the sum of the molar concentrations of sulforaphane and its glutathione-derived metabolites in urine). Data presented as ratio of the geometric mean of the total urinary levels of sulforaphane and its metabolites between post intervention and baseline.
Change in the NRF2 Target Gene Transcripts	Baseline up to 14 days post intervention	Change in the expression of NQO1 in the buccal cells after 8 tablets per day of Avmacol. Data presented as ratio of the geometric mean of the gene expression of NQO1 between post intervention and baseline.

Trial Locations

Locations (2)

Banner University Medical Center - Tucson; 🇺🇸 Tucson, Arizona, United States

University of Arizona Cancer Center - Prevention Research Clinic; 🇺🇸 Tucson, Arizona, United States