Phase II trial of oral 1,25-dihydroxyvitamin D (calcitriol) in hormone refractory prostate cancer

Jennifer L. Osborn; Gary G. Schwartz; David C. Smith; Robert Bahnson; Roger Day; Donald L. Trump

doi:10.1016/1078-1439(95)00061-5

Phase II trial of oral 1,25-dihydroxyvitamin D (calcitriol) in hormone refractory prostate cancer

Jennifer L. Osborn, Gary G. Schwartz, David C. Smith, Robert Bahnson, Roger Day, Donald L. Trump

Great Plains IDeA-CTR

Research output: Contribution to journal › Article

129 Scopus citations

Abstract

Epidemiologic and experimental data support a role for 1,25-dihydroxyvitamin D₃ in the growth regulation of prostate cancer. We conducted a phase II clinical trial evaluating calcitriol (1,25(OH)₂D₃) in patients with hormone refractory prostate cancer. We enrolled 14 patients in this study. 1,25(OH)₂D₃ was initiated at a daily oral dose of 0.5 μg and escalated to 1.5 μg daily. No objective responses were observed. However, in two patients decreases of 25% and 45% in prostate specific antigen levels were seen. Hypercalcemia was the predominant toxicity. We conclude that 1,25(OH)₂D₃ given in this manner is inactive in advanced prostate cancer. Dose escalation of oral 1,25(OH)₂D₃ is limited by hypercalcemia.

Original language	English (US)
Pages (from-to)	195-198
Number of pages	4
Journal	Urologic Oncology: Seminars and Original Investigations
Volume	1
Issue number	5
DOIs	https://doi.org/10.1016/1078-1439(95)00061-5
State	Published - 1995

Keywords

1
25(OH)D
Prostate cancer
Vitamin D
calcitriol
therapeutics

ASJC Scopus subject areas

Oncology
Urology

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title = "Phase II trial of oral 1,25-dihydroxyvitamin D (calcitriol) in hormone refractory prostate cancer",

abstract = "Epidemiologic and experimental data support a role for 1,25-dihydroxyvitamin D3 in the growth regulation of prostate cancer. We conducted a phase II clinical trial evaluating calcitriol (1,25(OH)2D3) in patients with hormone refractory prostate cancer. We enrolled 14 patients in this study. 1,25(OH)2D3 was initiated at a daily oral dose of 0.5 μg and escalated to 1.5 μg daily. No objective responses were observed. However, in two patients decreases of 25% and 45% in prostate specific antigen levels were seen. Hypercalcemia was the predominant toxicity. We conclude that 1,25(OH)2D3 given in this manner is inactive in advanced prostate cancer. Dose escalation of oral 1,25(OH)2D3 is limited by hypercalcemia.",

keywords = "1, 25(OH)D, Prostate cancer, Vitamin D, calcitriol, therapeutics",

author = "Osborn, {Jennifer L.} and Schwartz, {Gary G.} and Smith, {David C.} and Robert Bahnson and Roger Day and Trump, {Donald L.}",

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AU - Osborn, Jennifer L.

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AU - Smith, David C.

AU - Bahnson, Robert

AU - Day, Roger

AU - Trump, Donald L.

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N2 - Epidemiologic and experimental data support a role for 1,25-dihydroxyvitamin D3 in the growth regulation of prostate cancer. We conducted a phase II clinical trial evaluating calcitriol (1,25(OH)2D3) in patients with hormone refractory prostate cancer. We enrolled 14 patients in this study. 1,25(OH)2D3 was initiated at a daily oral dose of 0.5 μg and escalated to 1.5 μg daily. No objective responses were observed. However, in two patients decreases of 25% and 45% in prostate specific antigen levels were seen. Hypercalcemia was the predominant toxicity. We conclude that 1,25(OH)2D3 given in this manner is inactive in advanced prostate cancer. Dose escalation of oral 1,25(OH)2D3 is limited by hypercalcemia.

AB - Epidemiologic and experimental data support a role for 1,25-dihydroxyvitamin D3 in the growth regulation of prostate cancer. We conducted a phase II clinical trial evaluating calcitriol (1,25(OH)2D3) in patients with hormone refractory prostate cancer. We enrolled 14 patients in this study. 1,25(OH)2D3 was initiated at a daily oral dose of 0.5 μg and escalated to 1.5 μg daily. No objective responses were observed. However, in two patients decreases of 25% and 45% in prostate specific antigen levels were seen. Hypercalcemia was the predominant toxicity. We conclude that 1,25(OH)2D3 given in this manner is inactive in advanced prostate cancer. Dose escalation of oral 1,25(OH)2D3 is limited by hypercalcemia.

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