Urological Science

ORIGINAL ARTICLE
Year
: 2019  |  Volume : 30  |  Issue : 5  |  Page : 216--219

The effect of dutasteride and tomato extract combination on reducing blood loss after transurethral resection of the prostate


Eriawan Agung Nugroho1, Selly Adyta Kemara2, Siti Amarwati3, Tommy Supit2,  
1 Department of Urology, Faculty of Medicine, Diponegoro University, Dr. Kariadi General Hospital, Semarang, Indonesia
2 Department of General Surgery, Faculty of Medicine, Diponegoro University, Dr. Kariadi General Hospital, Semarang, Indonesia
3 Department of Anatomy Pathology, Faculty of Medicine, Diponegoro University, Dr. Kariadi General Hospital, Semarang, Indonesia

Correspondence Address:
Eriawan Agung Nugroho
Jl. Dr. Sutomo No. 16, Randusari, Semarang 50244
Indonesia

Abstract

Context: Lycopene, a carotenoid found in tomatoes, possesses antiangiogenic activities that might be useful in the management of prostate enlargement. However, the current evidence is still inconclusive in regard to this matter. Aims: The aim of the study was to investigate the effect of combined oral dutasteride and lycopene consumption in reducing posttransurethral resection of the prostate (TURP) bleeding. Settings and Design: Twenty-two individuals diagnosed with benign prostatic hyperplasia were randomly allocated into two groups of equal size. Thirty days prior to TURP, individuals in Group 1 (control) were given daily oral dutasteride 0.5 mg and placebo pill and individuals in Group 2 (intervention) were given dutasteride 0.5 mg and lycopene 30 mg. Subjects and Methods: The parameters measured in this study were pre- and post-TURP plasma erythrocyte count and microvessel density (MVD) of resected prostate tissue stained with CD34. Statistical Analysis Used: Data homogeneity was tested using the Shapiro–Wilk test. Individuals' characteristics were analyzed using the Mann–Whitney U-test and plasma erythrocyte and MVD analyzed using the t-test. Spearman's correlation analysis was performed to find significant correlations between the two variables. Results: There were two dropouts. The mean MVD in the control group was significantly higher compared to the intervention group (28.2 ± 12.3 vs. 18.3 ± 7.6 vessel/mm2, P = 0.044). Reduction of post-TURP plasma erythrocytes was significantly higher in the control group compared to the intervention group (−0.34 ± 0.18 vs. −0.17 ± 0.12 106/μL, P = 0.048). Conclusions: Daily consumption of dutasteride and lycopene for at least 30 days reduced the formation of blood vessels in the prostate and reduced blood loss post-TURP.



How to cite this article:
Nugroho EA, Kemara SA, Amarwati S, Supit T. The effect of dutasteride and tomato extract combination on reducing blood loss after transurethral resection of the prostate.Urol Sci 2019;30:216-219


How to cite this URL:
Nugroho EA, Kemara SA, Amarwati S, Supit T. The effect of dutasteride and tomato extract combination on reducing blood loss after transurethral resection of the prostate. Urol Sci [serial online] 2019 [cited 2019 Dec 9 ];30:216-219
Available from: http://www.e-urol-sci.com/text.asp?2019/30/5/216/267061


Full Text



 Introduction



Transurethral resection of the prostate (TURP) remains a gold standard in the treatment of benign prostatic hyperplasia (BPH) and is frequently performed in our institution.[1],[2] Albeit low in incidence, postoperative hemorrhage after TURP remains a potentially life-threatening complication that requires a prompt blood transfusion.[3] Dutasteride is a 5-α-reductase inhibitor (5-ARI) proven effective in reducing prostate volume by inhibiting the synthesis of dihydrotestosterone.[4] The drug also decreases prostatic vascularity by means of inhibiting vascular endothelial growth factor (VEGF) expression, reducing vascular density within the prostatic suburethral tissue.[5],[6] This translates its use as a treatment of BPH for reducing blood loss. Preoperative treatment with dutasteride for 2 weeks prior to TURP was shown to reduce surgical bleeding and length of hospitalization.[7],[8]

Lycopene, a carotenoid found in tomatoes, is one of the best research phytotherapeutic agents for prostate cancer. Initial investigations of its effect on prostate cancer led to an observation of a protective effect on BPH, where a high intake of lycopene was associated with reduced risk of BPH.[9] The beneficial effect was hypothesized to be a result of a multitude of biochemical effects of the carotenoid; antioxidative, anti-inflammatory, proapoptotic, and antiproliferative.[10],[11],[12] Lycopene was also found to possess antiangiogenesis activity, similar to dutasteride.[13] A further molecular study demonstrated that such effect was a result of the inhibition of VEGF receptor-2 (VEGFR2)-mediated phosphorylation of extracellular signal-regulated kinase (ERK)/p38 signaling pathways.[14] However, evidence of the reduction of vascularization within the prostatic tissue and the clinical outcome that results from it is lacking. This study investigated the effect of daily consumption of dutasteride and lycopene in patients with BPH prior to TURP, on prostate vascularity and perioperative bleeding.

 Subjects and Methods



Patient selection

This clinical trial was performed in November 2017–March 2018 with ethical clearance from the governing board of ethics (707/EC/FK-RSDK/XII/2017). Twenty-two patients clinically diagnosed with the first case of acute urinary retention caused by BPH into two groups: group 1 (n = 11) comprised controls that received oral dutasteride (Avodart®, GlaxoSmithKline, Brentford, England) 0.5 mg/day and one capsule of placebo (sugar) and Group 2 (n = 11) intervention participants received daily dutasteride 0.5 mg/day and tomato extract (Solanum lycopersicum) lycopene (GNC, Indonesia). The pretreatment was given for at least 30 days prior to TURP. All drugs (dutasteride, lycopene, and placebo) were each prepared into a plain 00-size red gelatin capsule (Capsulcn International Co., Ltd., China) to ensure participant blinding. Two of each corresponding capsule were prepared in a clear plastic container labeled day 1 to day 30 to ease drug consumption. Each participant was supplied with a 15-day worth of treatment before required to return to the clinic for follow-up and top-up for the rest of 15 days. Those who failed to return a complete set of plastic container during follow-up were considered to be noncompliant and excluded from the study. Patients with renal failure, major cardiovascular disease, evidence of other genitourinary diseases, very large prostate (>90 mL), history of previous prostate surgery, and treatment with 5-ARI within 6 months were excluded.

One-blinded board-certified urologist measured the initial prostate volume using transrectal ultrasound (TRUS) with ellipsoid formula and performed all the TURP. Prostate resection was performed using bipolar 24-Fr resectoscope (Karl Storz®, Tuttlingen, Germany) under spinal anesthesia with sterile water (Otsuka Pharmaceutical, Japan) as irrigation. Resected periurethral tissue was fixated in 10% neutral buffered formalin and paraffinized for further histopathological analysis. A postoperative 22-Fr three-way urinary catheter with continuous irrigation with sterile water was maintained for an additional 48 h unless bleeding was still observable.

Hematology and histopathological examination

The level of plasma erythrocytes (million cells/μL) was analyzed from 3 mL of blood taken from a median cubital vein 1 h before and after TURP. Blood samples were analyzed using Sysmex KX-21 Automated Hematology Analyzer (Sysmex, Shanghai, China). The difference of erythrocyte count was quantified from the subtraction of pre-TURP with the post-TURP value. Prostate angiogenesis was evaluated in terms of microvascular density (MVD) by immunohistochemistry.[15] Paraffin blocks of resected prostate tissue were processed for CD34 (DAKI M.7165) staining using the standard labeled streptavidin-biotin technique. Microscopic analysis was performed using Olympus BX41 light microscope (Olympus, Japan) at ×4 magnification to locate areas with the highest microvessel concentration. Quantification of MVD (vessel/mm2) was made from 10 high-power views at ×100 magnification within the determined area of microvascular “hotspots.” Histological confirmation of BPH diagnosis and MVD analysis was conducted blinded by one board-certified pathologist.

Statistical analysis

The Shapiro–Wilk test was used to determine the data normality. Individuals' characteristics were analyzed using the Mann–Whitney U-test and plasma erythrocyte and MVD analyzed using the t-test. Spearman's correlation analysis was performed to find significant correlations between the two variables. All statistical analysis was performed using SPSS (SPSS Inc., IBM Corporation, New York, USA). Data were presented in mean ± standard deviation unless stated otherwise. Statistical significance was set at P < 0.05.

 Results



One patient dropped out from the intervention group because he did not consent for TURP operation. Histological analysis of the prostate tissue of another patient was revealed to be malignant, thus excluded from the study. A total of twenty patients were accounted at the end of the study. No side effects of negative drug interaction between dutasteride and lycopene were reported. Individuals from both the groups shared similar baseline characteristics with no statistically significant differences [Table 1]. Male individuals in the lycopene group were slightly older (65.70 ± 7.76 vs. 65.00 ± 6.32 years, P = 0.83), had smaller prostate (36.12 vs. 37.53 mL, P = 0.59), shorter duration of pretreatment (26.12 vs. 37.53 days, P = 0.59), and usage of urinary catheter (32 vs. 34 days, P = 0.35). The operative time taken was almost identical for both the groups.{Table 1}

The mean reduction of erythrocyte and amount of MVD of the control group was significantly greater compared to the lycopene group (−0.3 ± 0.2 vs. −0.17 ± 0.12 million cells/μL, P = 0.05, and 28.20 ± 12.33 vs. 18.30 ± 7.62, P = 0.04, respectively). Spearman's correlation test showed a medium positive correlation between the two variables [Table 2].{Table 2}

 Discussion



Dihydrotestosterone (DHT) blocker or 5-ARI is an accepted medication for treating BPH and is commonly prescribed along with alpha-1 adrenergic receptor blocker as combination therapy. Early experimental and animal studies with finasteride showed a reduction of prostatic blood flow and vascular density.[16],[17] This sparks considerable interests in the utilization of 5-ARI for pretreatment before TURP to reduce perioperative blood loss, although such practice is not generally accepted.[18] 5-ARI blocks the conversion of testosterone to DHT, reducing the bioactivity of androgen-controlled angiogenic growth factors such as VEGF. Dutasteride acts on all three isoforms of 5α-reductase providing greater suppression than finasteride. This theoretically should produce a greater effect than finasteride. However, one meta-analysis showed that pretreatment with finasteride reduces perioperative blood loss but inconclusive for dutasteride.[19] The exact reason why dutasteride was inferior compared to finasteride in reducing angiogenesis remains to be elucidated.

Numerous studies have investigated the effect of lycopene consumption for the prevention and treatment of BPH and prostate cancer. A meta-analysis of eight randomized controlled trials showed that lycopene consumption decreased prostate cancer diagnosis (relative risk [RR] = 0.95, 95% confidence interval [CI] = 0.63, 1.44), decreased BPH diagnosis (RR = 0.92, 95% CI = 0.66, 1.29), and significantly reduced prostate-specific antigen levels (Mean difference (MD) = −6.00, 95% CI = −8.92, −3.08).[20] Numerous biochemical effects of lycopene have been described, mainly from the bioactivity of lycopenoids, the main metabolic product of lycopene.[21] The main interest of this study is the antiangiogenesis of lycopene because it directly translates to the number of blood vessels within the prostate. Less vascularity within the prostatic tissue means that fewer blood vessels are transected during TURP, which results in less blood loss. This is observed in this study where patients with smaller MVD suffered from less reduction of erythrocyte level as a result from bleeding.

The mechanism by which lycopene inhibits angiogenesis has been explored by Chen et al. in an ex vivo study using human umbilical vein endothelial cells (HUVECs). Lycopene inhibits MMP-2/uPA system through VEGFR2-mediated PI3K-Akt and ERK/p38 signaling pathways leading to a reduction in migration, invasion, and tube formation of HUVECs.[14] Whether the reduction of prostate vascularity is a result of similar mechanisms or in some other way is currently unknown.

Several study limitations were identified. There was a minor variability of the period of pretreatment, up to 4 days, caused by hospital logistics and operation queue. The biological effect of dutasteride and lycopene consumption in such a short period of time should be negligible.[11] There is no group in the study that received no treatment at all, including 5-ARI. The observed value from this study could be a result of the variability of the effect of dutasteride. A larger randomized controlled trial is required to confirm the finding of this study.

Short-term daily consumption of 30-mg lycopene and 0.5-mg dutasteride was more effective compared to dutasteride alone in reducing prostate MVD and perioperative blood loss related to TURP in patients with BPH. Lycopene can be considered as a safe phytotherapeutic agent combined with 5-ARI in reducing perioperative bleeding of BPH patients undergoing TURP.

Acknowledgments

We would like to thank all operating theater and laboratory personnel who aided us in the making of this study.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

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