A Comparison of Side Effects in Hypogonadal Men Treated With Natesto Versus Testosterone Injections

Phase 4

Completed

Conditions: Hypogonadism, Male

Interventions: Drug: Testosterone Cypionate 200 Mg/ML
Drug: Intranasal Testosterone

Registration Number: NCT04439799

Lead Sponsor: University of Miami

Brief Summary: The purpose of this study is to evaluate changes in vascular parameters and the prevalence of side effects in subjects receiving 1 cc (200mg) every 2 weeks intramuscular (IM) of Testosterone Cypionate versus subjects receiving 11mg three times daily (TID) Natesto to participant with clinical hypogonadism.

Detailed Description: Administration of exogenous testosterone as efficacious treatment for male hypogonadism has been part of medical practice for more than 50 years. Testosterone replacement therapy (TRT) is becoming more widely available and has seen a greater than three-fold increase in use in men 40 years and older. Current delivery systems of TRT include transdermal gels and patches, intranasal gels (currently marketed as Natesto), injection therapy, and long acting subcutaneous pellets.

Natesto is a short-acting formulation of testosterone delivered intranasally to men diagnosed with low T. This has the potential to avoid side effects related to TRT that are commonly seen with other delivery methods, namely polycythemia, acne, male-pattern hair loss, azoospermia and hyperestrogenemia.

Testosterone Cypionate injections are the most common form of TRT in the USA. Testosterone Cypionate has many reported side effects, the most common being polycythemia, gynecomastia, hair loss, acne, decreased spermatogenesis, and testicular atrophy. In a multicenter retrospective study, it has been shown that the prevalence of polycythemia in men on testosterone replacement (injections) was 11.2%. In this study, we will compare hematocrit changes caused by treatment with Testosterone Cypionate and Natesto in a parallel arm, randomized study. To date, there have been no direct head-to-haed comparisons of these formulations.

We hypothesize that the short-acting pharmacokinetics of Natesto more closely resembles the natural pulsatility of testosterone and therefore can avoid side effects traditionally seen in long-acting, exogenous testosterone formulations

Recruitment & Eligibility

Status: COMPLETED

Sex: Male

Target Recruitment: 81

Inclusion Criteria

Voluntarily sign and date the study consent form(s), which have been approved by an Institutional Review Board (IRB). Written consent must be obtained prior to the initiation of any study procedures.
Documented diagnosis of primary hypogonadism (congenital or acquired) or hypogonadotropic hypogonadism (congenital or acquired).
Serum total testosterone < 300 ng/dL on 2 measurements
Naïve to androgen replacement or has discontinued current treatment and completed a washout of 4 months following androgen treatment.
Men deemed to be candidates for TRT based on the results of a medical history, physical examination, vital signs, laboratory profile and a 12-lead electrocardiogram (ECG).

Exclusion Criteria

History of significant sensitivity or allergy to androgens, or product excipients.
Clinically significant findings in the pre-study examinations including abnormal breast examination requiring follow-up, abnormal ECG.
Abnormal prostate digital rectal examination (DRE) with palpable nodule(s)
Body mass index (BMI) ≥ 40 kg/m2.
Clinically significant abnormal laboratory value, in the opinion of the investigator, in serum chemistry, hematology, or urinalysis including but not limited to:
1. Baseline hemoglobin > 16 g/dL or Hematocrit (HCT) 48%
2. Prostate Specific Antigen (PSA) > 4 ng/mL
History of seizures or convulsions, including febrile, alcohol or drug withdrawal seizures.
History of any clinically significant illness, infection, or surgical procedure within 4 weeks prior to study drug administration.
History of stroke or myocardial infarction within the past 5 years.
History of, or current or suspected, prostate or breast cancer.
History of diagnosed, severe, untreated, obstructive sleep apnea.
History of abuse of alcohol or any drug substance in the opinion of the investigator within the previous 2 years.
Donation or loss of 550 mL or more blood volume (including plasmapheresis) or receipt of a transfusion of any blood product within 12 weeks prior to the start of treatment.
Inadequate venous access for collection of serial blood samples required for pharmacokinetic profiles.
Receipt of any subcutaneous testosterone pellets within the last 6 months.
Inability to understand and provide written informed consent for the study.

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Testosterone Cypionate Group	Testosterone Cypionate 200 Mg/ML	Participants in this group will receive the intramuscular Testosterone Cypionate intervention for four months
Natesto Group	Intranasal Testosterone	Participants in this group will receive the intranasal testosterone (Natesto) intervention for four months.

Primary Outcome Measures

Name	Time	Method
Change in Hematocrit (Hct) Levels.	Baseline to 4 months	Changes in serum Hematocrit levels will be assessed in percentage

Secondary Outcome Measures

Name	Time	Method
Change in PSA Levels	Baseline to 4 months	Change in serum Prostate Specific Antigen (PSA) levels will be assessed in ng/mL.
Change in Hormone Levels	Baseline to 4 months	Change in serum hormone levels including Testosterone, 17-Hydroxyprogesterone (17-OHP) assessed in ng/dL.
Changes in IIEF-6 Score	Baseline to 4 months	The International Index of Erectile Function (IIEF)-6 is a 6-item subdomain self-evaluation questionnaire of erectile function. Each item is scored from 0-5 with the total score ranging from 0-30 with the higher score indicating better erectile function.
Change in Estradiol Levels	Baseline to 4 months	Change in serum estradiol levels will be assessed in pg/mL.