NCT06312761

Single-Dose Pharmacokinetics of Oral Testosterone Undecanoate With and Without Concomitant Inhibition of UGT2B17

Single-Dose Pharmacokinetics of Oral Testosterone Undecanoate With and Without Concomitant Inhibition of UGT2B17 With Oral Curcumin in Normal Men With Experimental Hypogonadism

• Status: Unknown
• Phase: Phase 1 / Phase 2
• Study type: Interventional
• Enrollment: 10 (estimated)
• Sponsor: University of Washington · Academic / Other
• Sex: Male
• Age: 18 Years – 55 Years
• Healthy volunteers: Accepted

Summary

This study will be performed in normal men whose endogenous testosterone production has been temporarily suppressed by the administration of a single dose of 120 mg of the oral GnRH antagonist Relugolix, which is approved for the treatment of prostate cancer, and can suppress endogenous testosterone biosynthesis for 48-72 hours after a single dose.

Detailed description

The study will have three phases: a screening period, a 3-day drug exposure period, and a one-month recovery period (see Table 1, Experimental Design). Screening Visit: At screening, study investigators will consent subjects, perform an interview and physical examination; blood samples for measurement of hormones (T, DHT, Estradiol (E2), FSH and LH), routine hematology, chemistry and hepatic function and a DNA sample for UGT2B17 genotype will be obtained from the buccal mucosa and a spot urine specimen obtained for a testosterone glucuronide/androsterone glucuronide ratio (a marker of endogenous UGT2B17 activity). No drugs will be administered in the screening period. The screening visit should take approximately 60 minutes. Day 1 (15-minute visit): Blood pressure and heart rate will be measured prior to the administration of Relugolix 120 mg orally on an empty stomach. Day 2 (9 hour stay): Placement of IV and dosing of Testosterone Undecanoate 237 mg once with two ensures. The first dose of oral testosterone will be administered at 0900 (+/- 30 minutes) in the morning with two Ensures. After drug administration, subjects will have 10 ccs of blood drawn for the measurement of serum testosterone for the measurement of testosterone Predose, 0.5, 1, 1.5 2, 3, 4, 6, and 8 hours after the morning dose and will have the iv removed. Day 3 (9 hour stay): Placement of IV and dosing of Testosterone Undecanoate 237 mg once with two Ensures and 630 mg of oral Curcumin. The second dose of oral testosterone will be administered at 0900 (+/- 30 minutes) in the morning. After drug administration, subjects will have 10 ccs of blood drawn for the measurement of serum testosterone for the measurement of testosterone Predose, 0.5, 1, 1.5, 2, 3, 4, 6, and 8 hours after the morning dose and will have the iv removed. Day 4 (15-minute visit): Subjects will come into the clinic at 0900 for a 24-hour blood draw and adverse effect assessment. Day 28-42 (30-minute visit): Subjects will undergo a final assessment (physical examination, vitals and weight measurements and blood draw) on day 28-42. We will confirm at the follow-up visit that there has been recovery from Relugolix-induced hypogonadism (i.e., testosterone levels have returned to within 25% of baseline). If a subject has not recovered by this visit, he will be reassessed at 2-week intervals until recovery is documented. The total amount of blood drawn over the study protocol will not exceed 500 mL per subject.

Conditions

• Hypogonadism, Male

Interventions

Type	Name	Description
DRUG	Relugolix 120Mg Tab	Relugolix 120 mg single dose - All subjects
DIETARY_SUPPLEMENT	Curcumin	Curcumin 630 mg single dose
DRUG	Testosterone Undecanoate 237 MG Oral Capsule	Testosterone Undecanoate 237 MG Oral Capsule

Timeline

• Start date: 2024-06-01
• Primary completion: 2025-12-31
• Completion: 2025-12-31
• First posted: 2024-03-15
• Last updated: 2024-03-15