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A high proviral load (PVL) is recognized as a risk factor for human T cell leukemia virus-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP), but there is a lack of prospective studies evaluating whether or not HTLV-1 carriers with high PVL are at risk of developing HAM/TSP or other HTLV-1-related diseases. Here, we compare the incidence of clinical manifestations and the cytokine levels in 30 HTLV-1 carriers with high (> 50,000 copies/106 PBMC) and an equal number of subjects with low proviral load. Participants were followed for 3 to 16 years (median of 11 years). The PVL, IFN-γ, TNF, and IL-10 levels were quantified at entry and at the end of the follow-up. Among the self-reported symptoms in the initial evaluation, only the presence of paresthesia on the hands was more frequent in the group with high PVL (p p

Background Erectile dysfunction (ED) occurs in more than 50% of patients with human T-cell lymphotropic virus type 1 (HTLV-1) infection. In the general population, atherosclerosis is the main risk factor related to ED. Aim To compare the contribution of neurologic disorders from HTLV-1 with that of atherosclerosis as risk factors for ED in men with HTLV-1. Methods In this cross-sectional study, men 18 to 70 years old with HTLV-1 were classified into one of two groups according to the presence or absence of ED. They were compared for obesity, waist circumference, dyslipidemia, metabolic syndrome, diabetes mellitus, high blood pressure, and neurologic manifestations. Comparisons between proportions were performed using the χ2 or Fisher exact test. Logistic regression analysis was performed to identify predictors of ED. Subjects with HTLV-1 were classified into three groups based on Osame's Disability Motor Scale and the Expanded Disability Status Scale: (i) HTLV-1 carriers; (ii) probable HTLV-1–associated myelopathy or tropical spastic paraparesis; and (iii) definitive HTLV-1–associated myelopathy or tropical spastic paraparesis. The International Index of Erectile Function was used to determine the degree of ED. Results In univariate logistic regression, age older 60 years (P = .003), diabetes mellitus (P = .042), and neurologic disease (P < .001) were associated with ED. In the multivariate model, the odds of ED was highest in patients with neurologic disease (odds ratio = 22.1, 95% CI = 5.3–92.3), followed by high blood pressure (odds ratio = 6.3, 95% CI = 1.4-30.5) and age older than 60 years (odds ratio = 4.6, 95% CI = 1.3–17.3). Clinical Implications In men infected with HTLV-1, neurologic dysfunction is a stronger predictor of ED than risk factors for atherosclerosis. Strengths and Limitations The small number of patients limited the power of the statistical analysis, but clearly neurologic manifestations had a greater association with ED than risk factors for atherosclerosis, and there was no association between metabolic syndrome and severity of ED. Conclusion Neurologic impairment is the major cause of ED in individuals infected with HTLV-1 and risk factors for atherosclerosis did not have a strong relation with ED in this population.

Introduction Erectile dysfunction (ED) is associated with neurological damage due to human T-lymphotropic virus 1 (HTLV-1) infection, but hormonal and psychogenic factors also cause ED. Aim To evaluate the association of psychogenic and hormonal factors with ED in men infected with HTLV-1. Methods In this cross-sectional study, we compared total testosterone, follicle stimulating hormone, luteinizing hormone, prolactin, anxiety symptoms, depressive symptoms, and neurologic manifestations in HTLV-1-infected men with or without ED. The International Index of Erectile Function was used to determine the degree of ED. Participants were grouped according to Osame’s Motor Disability Scale and the Expanded Disability Status Scale: HTLV-1-associated myelopathy or tropical spastic paraparesis (HAM/TSP), probable HAM/TSP, or HTLV-1 carrier. Chi-square and Fisher’s exact tests were used to compare the groups, and regression analyses were used to show predictors of ED. Main Outcome Measure Sexual hormonal levels, psychogenic factors, and neurologic disabilities were found to be associated with ED. Results ED was associated with age older than 60 years (P < .001), degree of neurologic involvement (P Clinical Implications Neurological manifestations are a stronger predictor of ED than hormonal and psychogenic factors in HTLV-1-infected men. Strengths & Limitations The statistical power of the study was limited due to the low number of participants, but neurologic manifestations were clearly associated with ED. There was no strong association between hormonal and psychogenic factors and ED. Conclusion Hormonal and psychogenic factors did not show a strong association with ED in individuals with HTLV-1, but neurological manifestations were strongly associated with ED in these individuals.

Urinary symptoms occur in 19% of human T-cell lymphotropic virus type 1 (HTLV-1)-infected patients who do not fulfill criteria for HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) and in almost 100% of HAM/TSP patients. Few studies have evaluated therapies for overactive bladder (OAB) caused by HTLV-1 infection. This case report describes the effect of onabotulinum toxin A on the urinary manifestations of three patients with HAM/TSP and OAB symptoms. The patients were intravesically administered 200 units of Botox®. Their incontinence episodes improved, and their OAB symptoms scores (OABSS) reduced significantly. These data indicate that Botox® should be a treatment option for OAB associated with HTLV-1 infection.