R Choo

Summary

Affiliation: Toronto-Sunnybrook Regional Cancer Centre
Country: Canada

Publications

  1. ncbi request reprint Wide variation of prostate-specific antigen doubling time of untreated, clinically localized, low-to-intermediate grade, prostate carcinoma
    Richard Choo
    Toronto Sunnybrook Regional Cancer Center, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    BJU Int 94:295-8. 2004
  2. ncbi request reprint PSA doubling time of prostate carcinoma managed with watchful observation alone
    R Choo
    Toronto Sunnybrook Regional Cancer Center, University of Toronto, Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 50:615-20. 2001
  3. ncbi request reprint Positive resection margin and/or pathologic T3 adenocarcinoma of prostate with undetectable postoperative prostate-specific antigen after radical prostatectomy: to irradiate or not?
    Richard Choo
    Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 52:674-80. 2002
  4. ncbi request reprint Urodynamic changes at 18 months post-therapy in patients treated with external beam radiotherapy for prostate carcinoma
    Richard Choo
    Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 53:290-6. 2002
  5. ncbi request reprint (IN)-efficacy of salvage radiotherapy for rising PSA or clinically isolated local recurrence after radical prostatectomy
    Richard Choo
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 53:269-76. 2002
  6. ncbi request reprint The role of serial transrectal ultrasonography in a 'watchful waiting' protocol for men with localized prostate cancer
    G Hruby
    Toronto-Sunnybrook Regional Cancer Centre, University of Toronto, Ontario, Canada
    BJU Int 87:643-7. 2001
  7. ncbi request reprint Comparison of histologic grade between initial and follow-up biopsy in untreated, low to intermediate grade, localized prostate cancer
    R Choo
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Can J Urol 11:2118-24. 2004
  8. ncbi request reprint Is there a progression of histologic grade from radical prostatectomy to local recurrence in patients with clinically isolated local recurrence following surgery?
    R Choo
    Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Can J Urol 10:1981-5. 2003
  9. ncbi request reprint The role of serial free/total prostate-specific antigen ratios in a watchful observation protocol for men with localized prostate cancer
    V Do
    Dept of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    BJU Int 89:703-9. 2002
  10. ncbi request reprint Rise in prostate-specific antigen in men with untreated low-grade prostate cancer is slower during spring-summer
    R Vieth
    Mount Sinai Hospital, Toronto Sunnybrook Regional Cancer Center, Sunnybrook and Women s College Health Sciences Centre, University of Toronto, Toronto, Canada
    Am J Ther 13:394-9. 2006

Collaborators

Detail Information

Publications32

  1. ncbi request reprint Wide variation of prostate-specific antigen doubling time of untreated, clinically localized, low-to-intermediate grade, prostate carcinoma
    Richard Choo
    Toronto Sunnybrook Regional Cancer Center, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    BJU Int 94:295-8. 2004
    ..To assess the prostate specific antigen (PSA) doubling time of untreated, clinically localized, low-to-intermediate grade prostate carcinoma...
  2. ncbi request reprint PSA doubling time of prostate carcinoma managed with watchful observation alone
    R Choo
    Toronto Sunnybrook Regional Cancer Center, University of Toronto, Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 50:615-20. 2001
    ..To study prostate-specific antigen (PSA) doubling time of untreated, favorable grade, prostate carcinoma...
  3. ncbi request reprint Positive resection margin and/or pathologic T3 adenocarcinoma of prostate with undetectable postoperative prostate-specific antigen after radical prostatectomy: to irradiate or not?
    Richard Choo
    Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 52:674-80. 2002
    ..To evaluate the efficacy of postoperative adjuvant radiotherapy (RT) for positive resection margin and/or pathologic T3 (pT3) adenocarcinoma of the prostate with undetectable postoperative prostate-specific antigen (PSA) levels...
  4. ncbi request reprint Urodynamic changes at 18 months post-therapy in patients treated with external beam radiotherapy for prostate carcinoma
    Richard Choo
    Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 53:290-6. 2002
    ..To quantify the effect of radiotherapy (RT) on urodynamics at 18 months post-therapy, using urodynamic study, in prostate cancer patients undergoing definitive external beam RT...
  5. ncbi request reprint (IN)-efficacy of salvage radiotherapy for rising PSA or clinically isolated local recurrence after radical prostatectomy
    Richard Choo
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 53:269-76. 2002
    ..To determine the efficacy of external beam radiotherapy (RT) as salvage treatment for prostate-specific antigen (PSA) failure or local recurrence after radical prostatectomy...
  6. ncbi request reprint The role of serial transrectal ultrasonography in a 'watchful waiting' protocol for men with localized prostate cancer
    G Hruby
    Toronto-Sunnybrook Regional Cancer Centre, University of Toronto, Ontario, Canada
    BJU Int 87:643-7. 2001
    ..CONCLUSION: The use of serial TRUS in men with known but untreated prostate cancer is of limited value as a determinant of disease progression...
  7. ncbi request reprint Comparison of histologic grade between initial and follow-up biopsy in untreated, low to intermediate grade, localized prostate cancer
    R Choo
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Can J Urol 11:2118-24. 2004
    ..To examine the change of histologic grade of untreated, low to intermediate grade, clinically localized prostate cancer over time on repeat prostate biopsy...
  8. ncbi request reprint Is there a progression of histologic grade from radical prostatectomy to local recurrence in patients with clinically isolated local recurrence following surgery?
    R Choo
    Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Can J Urol 10:1981-5. 2003
    ..To evaluate whether there is any histologic progression from radical prostatectomy (RP) to local recurrence in patients with clinically isolated local recurrence following RP...
  9. ncbi request reprint The role of serial free/total prostate-specific antigen ratios in a watchful observation protocol for men with localized prostate cancer
    V Do
    Dept of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    BJU Int 89:703-9. 2002
    ....
  10. ncbi request reprint Rise in prostate-specific antigen in men with untreated low-grade prostate cancer is slower during spring-summer
    R Vieth
    Mount Sinai Hospital, Toronto Sunnybrook Regional Cancer Center, Sunnybrook and Women s College Health Sciences Centre, University of Toronto, Toronto, Canada
    Am J Ther 13:394-9. 2006
    ..The therapeutic implication is that vitamin D supplementation in the range of 2000 IU/d, a dose comparable to the effect of summer, can benefit men monitored for rising PSA...
  11. ncbi request reprint Are serial bone scans useful for the follow-up of clinically localized, low to intermediate grade prostate cancer managed with watchful observation alone?
    B K Yap
    Toronto Sunnybrook Regional Cancer Centre, Ontario, Canada
    BJU Int 91:613-7. 2003
    ..To assess the predictive value of serial bone scans as a surveillance tool for bone metastasis in men with clinically localized prostate cancer and managed with watchful observation...
  12. ncbi request reprint Urodynamic findings 3 months after radiotherapy in patients treated with conformal external beam radiotherapy for prostate carcinoma
    V Do
    Toronto Sunnybrook Regional Cancer Centre, University of Toronto, ON, Canada
    BJU Int 90:62-7. 2002
    ..To quantify the effect of radiotherapy (RT) on urodynamic function 3 months after RT in patients with prostate cancer undergoing definitive external beam RT...
  13. ncbi request reprint Accelerated radiotherapy with delayed concomitant boost in locally advanced squamous cell carcinoma of the head and neck
    R Mackenzie
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 45:589-95. 1999
    ..To determine the toxicity, maximum tolerated dose (MTD), and clinical effectiveness of a 5-week course of accelerated radiotherapy with delayed concomitant boost in locally advanced squamous cell carcinoma of the head and neck (SCCHN)...
  14. ncbi request reprint Disseminated intravascular coagulation and PC-SPES: a case report and literature review
    M Lock
    Department of Radiation Oncology, University of Toronto, Toronto Sunnybrook Regional Cancer Centre, Toronto, Ontario, Canada
    Can J Urol 8:1326-9. 2001
    ..This case may serve as a cautionary note to health care providers and patients regarding herbal remedies. Those using PC-SPES should have an increased level of surveillance for bleeding disorders...
  15. ncbi request reprint Intraindividual variation of PSA, free PSA and complexed PSA in a cohort of patients with prostate cancer managed with watchful observation
    Peter S Bunting
    Department of Clinical Pathology, Sunnybrook and Women s College Health Sciences Centre, Toronto, Ontario, Canada
    Clin Biochem 35:471-5. 2002
    ..To determine the intraindividual variation of prostate-specific antigen (PSA) isoforms in prostate cancer patients managed conservatively with watchful observation...
  16. doi request reprint Hypofractionated accelerated radiotherapy using concomitant intensity-modulated radiotherapy boost technique for localized high-risk prostate cancer: acute toxicity results
    Tee S Lim
    Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
    Int J Radiat Oncol Biol Phys 72:85-92. 2008
    ..To evaluate the acute toxicities of hypofractionated accelerated radiotherapy (RT) using a concomitant intensity-modulated RT boost in conjunction with elective pelvic nodal irradiation for high-risk prostate cancer...
  17. ncbi request reprint Prediction of radial distance of extraprostatic extension from pretherapy factors
    David J Schwartz
    Department of Radiation Oncology, Mayo Clinic and Foundation, Rochester, MN 55905, USA
    Int J Radiat Oncol Biol Phys 69:411-8. 2007
    ..In this study, the correlation of the EPEr from a large whole mount prostatectomy series was determined with respect to the needle biopsy and prostatectomy specimen findings...
  18. ncbi request reprint Prospective evaluation of quality of life in prostate cancer patients receiving combined treatment of postoperative radiotherapy plus androgen suppression for PT3 or positive resection margin after radical prostatectomy
    Richard Choo
    Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA
    Eur Urol 52:1645-50. 2007
    ..To examine the effect of postoperative radiotherapy (RT) plus 2-yr androgen suppression (AS) on quality of life (QOL) in patients with pathologic T3 or positive resection margins after radical prostatectomy (RP)...
  19. ncbi request reprint Two different perspectives in the management of pT3 and/or margin-positive prostate cancer after radical prostatectomy
    Richard Choo
    Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA
    BJU Int 98:773-6. 2006
  20. ncbi request reprint Effect of combined treatment with salvage radiotherapy plus androgen suppression on quality of life in patients with recurrent prostate cancer after radical prostatectomy
    Andrew Pearce
    Department of Radiation Oncology, Tom Baker Cancer Centre, University of Calgary, Calgary, Alberta, Canada
    Int J Radiat Oncol Biol Phys 65:78-83. 2006
    ..To examine the effect of salvage radiotherapy (RT) plus 2-year androgen suppression (AS) on quality of life (QOL)...
  21. ncbi request reprint Randomized trial comparing two fractionation schedules for patients with localized prostate cancer
    Himu Lukka
    Radiation Oncology Program, Juravinski Cancer Centre, McMaster University, 699 Concession St, Hamilton, Ontario, Canada, L8V 5C2
    J Clin Oncol 23:6132-8. 2005
    ..The optimal radiation dose fractionation schedule for localized prostate cancer is unclear. This study was designed to compare two dose fractionation schemes (a shorter 4-week radiation schedule v a longer 6.5-week schedule)...
  22. ncbi request reprint Effect of androgen suppression on hemoglobin in prostate cancer patients undergoing salvage radiotherapy plus 2-year buserelin acetate for rising PSA after surgery
    Sarat Chander
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, ON, Canada
    Int J Radiat Oncol Biol Phys 62:719-24. 2005
    ..To examine the effect of 2-year androgen suppression (AS) on the pattern and extent of hemoglobin (Hb) change...
  23. doi request reprint Testosterone recovery after prolonged androgen suppression in patients with prostate cancer
    Frederick H Yoon
    Department of Radiation Oncology, Odette Cancer Centre at the Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
    J Urol 180:1438-43; discussion 1443-4. 2008
    ..We prospectively examined the extent and timing of testosterone recovery in patients with prostate cancer treated with 2 years of androgen suppression...
  24. ncbi request reprint How are hemoglobin levels affected by androgen deprivation in non-metastatic prostate cancer patients?
    Richard Choo
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Can J Urol 12:2547-52. 2005
    ..To examine the change of hemoglobin in relation to testosterone level in non-metastatic prostate cancer patients receiving 2-year androgen suppression...
  25. ncbi request reprint Pilot study: potential role of vitamin D (Cholecalciferol) in patients with PSA relapse after definitive therapy
    Tony Choon Seng Woo
    Toronto Sunnybrook Regional Cancer Centre, Toronto, Ontario, Canada
    Nutr Cancer 51:32-6. 2005
    ..There were no side effects reported by any patient. Further study is needed to confirm this finding and to explore the potential therapeutic benefit of nutrient vitamin D in prostate cancer...
  26. ncbi request reprint Limited efficacy of salvage radiotherapy for biopsy confirmed or clinically palpable local recurrence of prostate carcinoma after surgery
    Richard Choo
    Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Canada Division of Radiation Oncology, Mayo Clinic, 200 First Street SW, Rochester, MI 55905, USA
    Radiother Oncol 74:163-7. 2005
    ..To assess the efficacy of salvage radiotherapy (RT) for biopsy confirmed or clinically palpable local recurrence of prostate adenocarcinoma after radical prostatectomy (RP)...
  27. ncbi request reprint Feasibility study: watchful waiting for localized low to intermediate grade prostate carcinoma with selective delayed intervention based on prostate specific antigen, histological and/or clinical progression
    Richard Choo
    Toronto Sunnybrook Regional Cancer Center and Sunnybrook and Women s College Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
    J Urol 167:1664-9. 2002
    ..We assessed the feasibility of a watchful waiting protocol with selective delayed intervention using clinical, prostate specific antigen (PSA) or histological progression as treatment indications for clinically localized prostate cancer...
  28. ncbi request reprint Long-term outcome of postorchiectomy surveillance for Stage I testicular seminoma
    Richard Choo
    Division of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    Int J Radiat Oncol Biol Phys 61:736-40. 2005
    ..To examine the long-term outcome and patterns of relapse in clinical Stage I testicular seminoma managed with surveillance alone after radical inguinal orchiectomy...
  29. ncbi request reprint An unusual case of concurrent breast and prostate cancer
    Tony Choon Seng Woo
    Toronto Sunnybrook Regional Cancer Centre, Department of Radiation Oncology, University of Toronto, Toronto, Ontario, Canada
    Can J Urol 11:2390-2. 2004
    ..The authors describe the case of a man who presented with breast cancer, which was preceded by prostate cancer. There are some common features in terms of the etiology, diagnosis and treatment of these two tumors which are discussed...
  30. ncbi request reprint Survey of radiation oncologists: practice patterns of the management of stage I seminoma of testis in Canada and a selected group in the United States
    Richard Choo
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, Toronto, Ontario, Canada
    Can J Urol 9:1479-85. 2002
    ..To evaluate practice patterns of the management of stage I seminoma of testis in Canada and a selected group in the United States...
  31. ncbi request reprint Expectant management with selective delayed intervention for favorable-risk prostate cancer
    Laurence H Klotz
    Toronto Sunnybrook Regional Cancer Centre, Ontario, Canada
    Can J Urol 9:2-7. 2002
    ..A policy of close monitoring with selective intervention for the 15% who progress rapidly is appealing, and is currently being investigated in several clinical trials...
  32. ncbi request reprint Individualized planning target volumes for intrafraction motion during hypofractionated intensity-modulated radiotherapy boost for prostate cancer
    Patrick Cheung
    Department of Radiation Oncology, University of Toronto, Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 62:418-25. 2005
    ..Conclusions: PTV margins can be reduced significantly with daily online correction of prostate position. Delivering a hypofractionated boost with this high-precision IMRT technique resulted in acceptable acute toxicity...