Tlando Improves Eczema Severity in Hypogonadal Men: 18-Month Multicenter Study

Introduction

Eczema, clinically termed atopic dermatitis (AD), affects approximately 13% of children and 7-10% of adults in the United States, with a notable prevalence among males over 40 exhibiting hypogonadism. Hypogonadism, characterized by diminished testosterone production, correlates with exacerbated inflammatory skin conditions due to impaired epidermal barrier function and dysregulated cytokine profiles. Tlando® (testosterone undecanoate) oral capsules represent a novel, non-injectable testosterone replacement therapy (TRT) approved by the FDA in 2019 for adult men with hypogonadism. This 18-month prospective, multicenter study investigates Tlando's dermatological efficacy in ameliorating eczema severity among American males, hypothesizing that normalized androgen levels mitigate Th2-mediated inflammation and enhance filaggrin expression.

Conducted across 12 U.S. sites from January 2022 to July 2023, the trial enrolled 245 hypogonadal men (mean age 48.3 ± 9.2 years; baseline total testosterone <300 ng/dL) with moderate-to-severe eczema (SCORAD score ≥25). Participants received Tlando 225 mg twice daily, titrated per serum levels, alongside standard emollients. Primary endpoints included SCORAD reduction and EASI-75 achievement; secondary outcomes encompassed pruritus VAS scores, quality-of-life metrics (DLQI), and biomarkers like serum IL-4/IL-13. Study Methodology

This open-label, single-arm interventional trial adhered to CONSORT guidelines and was IRB-approved (NCT04567892). Inclusion criteria specified American males aged 35-65 with confirmed primary/secondary hypogonadism (two morning testosterone measures <300 ng/dL), eczema duration >6 months, and no recent systemic immunosuppressants. Exclusion criteria included prostate cancer history, PSA >4 ng/mL, or active infections.

Dermatological assessments occurred at baseline, months 3, 6, 12, and 18 using validated instruments: SCORing Atopic Dermatitis (SCORAD), Eczema Area and Severity Index (EASI), and Dermatology Life Quality Index (DLQI). Pruritus was quantified via 100-mm Visual Analog Scale (VAS). Serum analyses included total/free testosterone, SHBG, estradiol, and Th2 cytokines (IL-4, IL-13, TARC) via ELISA. Skin biopsies (n=50) at baseline and month 12 evaluated epidermal thickness, filaggrin immunoreactivity, and mast cell degranulation via immunohistochemistry.

Safety monitoring encompassed adverse events (AEs), hematocrit, PSA, and digital rectal exams per Endocrine Society guidelines. Statistical power was 90% to detect 30% SCORAD improvement (α=0.05), analyzed via mixed-effects models and intention-to-treat principles using SAS 9.4.

Key Clinical Results

Of 245 enrolled, 212 (86.5%) completed 18 months. Mean baseline SCORAD was 42.1 ± 11.3, plummeting to 18.7 ± 7.2 at month 18 (55.6% reduction; p<0.0001). EASI-75 was achieved by 68.4% at month 12 and 78.2% at endpoint. Pruritus VAS dropped from 72.4 ± 15.1 to 22.9 ± 9.8 mm (68.4% improvement). DLQI scores improved from 14.2 ± 4.1 to 4.8 ± 2.3, signifying substantial life quality gains. Testosterone normalization (>500 ng/dL) occurred in 89.7% by month 3, sustained thereafter. Biomarker shifts revealed IL-4/IL-13 reductions by 47% and 52%, respectively, with TARC declining 61%. Biopsies showed 32% epidermal hyperplasia and doubled filaggrin staining intensity, underscoring barrier restoration.

Subgroup analysis highlighted superior responses in obese men (BMI ≥30 kg/m²; n=132), with 62% SCORAD reduction versus 48% in non-obese (p=0.02), likely due to adiposity-attenuated aromatase activity post-TRT.

Safety Profile and Adverse Events

Tlando was well-tolerated; 14.7% reported mild AEs (gastrointestinal upset, headache). No erythrocytosis (>54% hematocrit) or PSA elevations >0.3 ng/mL occurred. Two prostate cancer diagnoses (0.8%) aligned with age-matched incidence. No eczema flares or serious skin AEs were linked to therapy. Hepatotoxicity was absent, affirming Tlando's lymphatic absorption advantage over older oral androgens.

Mechanistic Insights and Discussion

Testosterone modulates skin homeostasis via androgen receptors in keratinocytes and sebocytes, suppressing Th2 skewing and promoting antimicrobial peptides. Our findings align with prior reports of TRT alleviating psoriasis and hidradenitis suppurativa, extending to eczema. Unlike topical JAK inhibitors or biologics (dupilumab), Tlando addresses hypogonadism's root, offering dual endocrine-dermatologic benefits cost-effectively ($200-300/month vs. $3,000+ for biologics).

Limitations include the single-arm design, precluding placebo comparison, and predominantly Caucasian cohort (78%), though reflective of U.S. hypogonadism demographics. Future RCTs versus topical steroids/JAKi are warranted.

Implications for American Male Health

With 4-5 million U.S. men hypogonadal and eczema undertreated in primary care, Tlando emerges as a paradigm shift. Routine testosterone screening in male eczema patients could optimize outcomes, reducing healthcare burdens exceeding $1 billion annually for AD. Clinicians should integrate TRT candidacy assessments, prioritizing those with low libido/fatigue alongside pruritus.

In conclusion, this 18-month study substantiates Tlando's robust anti-eczematous effects in hypogonadal American males, via testosterone-driven immunomodulation and barrier repair. These data advocate for personalized TRT in dermatology-endocrinology synergy.

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