Abstract
Purpose
To determine whether androgen blockade produces metabolic changes in urine and increases the risk of calculi after 1 year of treatment.
Materials and methods
The study included 38 patients, from the period April 2015 to June 2016, diagnosed with locally advanced prostate cancer or lymph node metastasis, and with an indication of androgen blockade. Androgen blockade was started with luteinising hormone-releasing hormone (LHRH) analogues, and a blood specimen, a fasting urine and 24-h urine were collected at the time of inclusion, and then at 1 year of follow-up. A study was performed at baseline and at 1 year with imaging tests. An analysis of the variables was performed with a p ≤ 0.05 considered as statistically significant.
Results
The mean age of the patients included in the study was 72.26 ± 6.75 years. As regards the biochemistry parameters, an increase in osteocalcin (from 16.28 ± 9.48 to 25.56 ± 12.09 ng/ml; p = 0.001) and an increase in β-crosslaps (from 0.419 ± 0.177 to 0.743 ± 0.268 ng/ml; p = 0.0001) were observed. In the urinary parameters, a significant increase was observed in the fasting calcium/creatinine ratio (from 0.08 ± 0.06 to 0.13 ± 0.06; p = 0.002) and in the 24-h calcium renal excretion (from 117.69 ± 66.92 to 169.42 ± 107.18 mg; p = 0.0001). Calculi formation was observed in 12 of the 38 patients included (31.6%), with a mean size of 3.33 ± 1.31 mm.
Conclusion
Treatment with LHRH analogues, as well as increasing the appearance of metabolic syndrome and speeding up the loss bone mineral density, causes an increase in fasting urine calcium.
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Acknowledgements
This study is the doctoral thesis of Enrique Diaz Convalia, Granada University. Program of Medicina Clinica and Salud Publica.
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EDC contributed to design, data collection, analysis, and writing, MAAP involved in data collection, design, and writing, MCCG contributed to data collection and design, ADA and NCC involved in data collection, and MAM involved in supervision and design.
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The Good Clinical Practice guidelines have been put into practice and followed, as well as those of the Helsinki Declaration in its latest version (Fortaleza, Brazil). The patients have received a detailed information sheet about the study and have voluntarily and consciously signed the consent to participate in the study. This study forms part of a research study for a doctoral thesis enrolled in the University of Granada (Spain), within the PhD program of Clinical Medicine and Public Health.
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Diaz-Convalia, E., Arrabal-Polo, M.A., Cano-Garcia, M.C. et al. Risk of renal stone formation in patients treated with luteinising hormone-releasing hormone analogues for prostate cancer: importance of bone metabolism and urine calcium. Int Urol Nephrol 50, 419–425 (2018). https://doi.org/10.1007/s11255-018-1793-1
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DOI: https://doi.org/10.1007/s11255-018-1793-1