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  • Zachary W A Klaassen

Abiraterone Acetate for Nonmetastatic Castration-Resistant Prostate Cancer - The Forgotten Dance Partner?

Klaassen, Z., Wallis, C. J. D. & Fleshner, N. E., Feb 2019, In : JAMA Oncology. 5, 2, p. 144-145 2 p.

Research output: Contribution to journalComment/debate

4 Scopus citations

Addressing Mental Health in Urology Patients: The Time is Now

Klaassen, Z. & Wallis, C. J. D., 2020, (Accepted/In press) In : European Urology Focus.

Research output: Contribution to journalEditorial

Open Access

Adjuvant Versus Salvage Radiotherapy Following Radical Prostatectomy: Meta-analysis of the Effect of Comparator Salvage Approach on Study Conclusions

Wallis, C. J. D., Klaassen, Z., Luckenbaugh, A. N., Laviana, A. A. & Bhindi, B., Mar 2020, In : European urology. 77, 3, p. 395-396 2 p.

Research output: Contribution to journalLetter

Adult Xp11 translocation associated renal cell carcinoma: Time to recognize

Klaassen, Z., Tatem, A., Burnette, J. O., Donohoe, J. M. & Terris, M. K., Nov 2012, In : Urology. 80, 5, p. 965-968 4 p.

Research output: Contribution to journalArticle

12 Scopus citations

Advanced Androgen Blockage in Nonmetastatic Castration-resistant Prostate Cancer: An Indirect Comparison of Apalutamide and Enzalutamide

Wallis, C. J. D., Chandrasekar, T., Goldberg, H., Klotz, L., Fleshner, N., Satkunasivam, R. & Klaassen, Z. W. A., Aug 1 2018, In : European Urology Oncology. 1, 3, p. 238-241 4 p.

Research output: Contribution to journalArticle

11 Scopus citations

Adverse event profile for immunotherapy agents compared with chemotherapy in solid organ tumors: a systematic review and meta-analysis of randomized clinical trials

Magee, D. E., Hird, A. E., Klaassen, Z., Sridhar, S. S., Nam, R. K., Wallis, C. J. D. & Kulkarni, G. S., Jan 2020, In : Annals of Oncology. 31, 1, p. 50-60 11 p.

Research output: Contribution to journalReview article

Open Access
7 Scopus citations

Age Differences in Patient-reported Psychological and Physical Distress Symptoms in Bladder Cancer Patients – A Cross Sectional Study

Ajaj, R., Berlin, A., Klaassen, Z., Chandrasekar, T., Wallis, C. J. D., Ahmad, A. E., Herrera Cáceres, J. O., Leao, R., Petrella, A. R., Fleshner, N., Matthew, A., Kulkarni, G. S. & Goldberg, H., Dec 2019, In : Urology. 134, p. 154-162 9 p.

Research output: Contribution to journalArticle

2 Scopus citations

A heterogeneous renal mass and arm pain in a 38-year-old african American female

Klaassen, Z., Peard, L., Wilhelm, S., Coulson, H. C., Li, Q., Kavuri, S. K., Terris, M. K. & Moses, K. A., Jun 1 2015, In : Urology. 85, 6, p. 1229-1232 4 p.

Research output: Contribution to journalArticle

A historical perspective: Bernhard von Langenbeck German Surgeon (1810-1887)

Cesmebasi, A., Oelhafen, K., Shayota, B. J., Klaassen, Z., Tubbs, R. S. & Loukas, M., 2014, In : Clinical Anatomy. 27, 7, p. 972-975 4 p.

Research output: Contribution to journalReview article

4 Scopus citations

Analysis of Heterogeneity in Survival Benefit of Immunotherapy in Oncology According to Patient Demographics and Performance Status: A Systematic Review and Meta-Analysis of Overall Survival Data

Butaney, M., Satkunasivam, R., Goldberg, H., Freedland, S. J., Patel, S. P., Hamid, O., Pal, S. K., Klaassen, Z. & Wallis, C. J. D., Mar 1 2020, In : American Journal of Clinical Oncology: Cancer Clinical Trials. 43, 3, p. 193-202 10 p.

Research output: Contribution to journalArticle

1 Scopus citations

Analysis of Suicide Risk in Patients with Penile Cancer and Review of the Literature

Simpson, W. G., Klaassen, Z. W. A., Jen, R. P., Hughes, W. M., Neal, D. E. & Terris, M. K., Apr 1 2018, In : Clinical Genitourinary Cancer. 16, 2, p. e257-e261

Research output: Contribution to journalReview article

10 Scopus citations

Anatomy of the ilioinguinal and iliohypogastric nerves with observations of their spinal nerve contributions

Klaassen, Z., Marshall, E., Tubbs, R. S., Louis, R. G., Wartmann, C. T. & Loukas, M., May 1 2011, In : Clinical Anatomy. 24, 4, p. 454-461 8 p.

Research output: Contribution to journalArticle

59 Scopus citations

Androgen deprivation therapy and gleason grade: Unravelling implications on survival

Scott, M., Klaassen, Z. & Wallis, C. J. D., Jun 1 2019, In : Translational Cancer Research. 8, 3, p. 729-731 3 p.

Research output: Contribution to journalReview article

11 Scopus citations

A Novel Splice Variant of HYAL-4 Drives Malignant Transformation and Predicts Outcome in Patients with Bladder Cancer

Lokeshwar, V. B., Morera, D. S., Hasanali, S. L., Yates, T. J., Hupe, M. C., Knapp, J., Lokeshwar, S. D., Wang, J., Hennig, M. J. P., Baskar, R., Escudero, D. O., Racine, R. R., Dhir, N., Jordan, A. R., Hoye, K., Azih, I., Manoharan, M., Klaassen, Z. W. A., Kavuri, S. K., Lopez, L. E. & 2 others, Ghosh, S. & Lokeshwar, B. L., Jul 1 2020, In : Clinical cancer research : an official journal of the American Association for Cancer Research. 26, 13, p. 3455-3467 13 p.

Research output: Contribution to journalArticle

A Paratesticular Serous Borderline Tumor in a Pediatric Patient with Proteus Syndrome

Klaassen, Z., Fox, P. J., McLees, L., Zheng, M., Sharma, S., Donohoe, J. M. & Neal, D. E., Dec 1 2015, In : Urology. 86, 6, p. 1218-1221 4 p.

Research output: Contribution to journalArticle

1 Scopus citations

Are there differences between de novo and secondary upper tract urothelial carcinoma tumors?

Goldberg, H., Cheung, D. C., Chandrasekar, T., Klaassen, Z., Wallis, C. J. D., Kulkarni, G. S., Sayyid, R., Evans, A., Masoomian, M., Bapat, B., Van Der Kwast, T., Hamilton, R. J., Zlotta, A. & Fleshner, N., 2019, In : Canadian Urological Association Journal. 13, 9, p. E292-E299

Research output: Contribution to journalArticle

Open Access

A review of supernumerary and absent limbs and digits of the upper limb

Klaassen, Z., Choi, M., Musselman, R., Eapen, D., Tubbs, R. S. & Loukas, M., Mar 1 2012, In : Surgical and Radiologic Anatomy. 34, 2, p. 101-106 6 p.

Research output: Contribution to journalReview article

1 Scopus citations

A single surgeon's experience with open, laparoscopic, and robotic partial nephrectomy

Klaassen, Z., Kohut, R. M., Patel, D., Terris, M. K. & Madi, R., 2014, In : ISRN Urology. 2014, 430914.

Research output: Contribution to journalArticle

2 Scopus citations

Association between PD-L1 status and immune checkpoint inhibitor response in advanced malignancies: a systematic review and meta-analysis of overall survival data

Wallis, C. J. D., Lawson, K., Butaney, M., Satkunasivam, R., Parikh, J. R., Freedland, S. J., Patel, S. P., Hamid, O., Pal, S. K. & Klaassen, Z., Jul 9 2020, In : Japanese Journal of Clinical Oncology. 50, 7, p. 800-809 10 p.

Research output: Contribution to journalArticle

1 Scopus citations

Association between Smoking and Survival Benefit of Immunotherapy in Advanced Malignancies: A Systematic Review and Meta-Analysis

Wallis, C. J. D., Satkunasivam, R., Butaney, M., Khan, U. A., Goldberg, H. A., Freedland, S. J., Patel, S. P., Hamid, O., Pal, S. K. & Klaassen, Z., Sep 1 2019, In : American Journal of Clinical Oncology: Cancer Clinical Trials. 42, 9, p. 711-716 6 p.

Research output: Contribution to journalArticle

Association of Obesity-Related Hemodilution of Prostate-Specific Antigen, Dihydrotestosterone, and Testosterone

Klaassen, Z., Howard, L. E., Moreira, D. M., Andriole, G. L., Terris, M. K. & Freedland, S. J., Apr 1 2017, In : Prostate. 77, 5, p. 466-470 5 p.

Research output: Contribution to journalArticle

9 Scopus citations

Association of Patient Sex with Efficacy of Immune Checkpoint Inhibitors and Overall Survival in Advanced Cancers: A Systematic Review and Meta-analysis

Wallis, C. J. D., Butaney, M., Satkunasivam, R., Freedland, S. J., Patel, S. P., Hamid, O., Pal, S. K. & Klaassen, Z., Apr 2019, In : JAMA Oncology. 5, 4, p. 529-536 8 p.

Research output: Contribution to journalArticle

51 Scopus citations

A Systematic Review and Network Meta-analysis of Novel Androgen Receptor Inhibitors in Non-metastatic Castration-resistant Prostate Cancer

Hird, A. E., Magee, D. E., Bhindi, B., Ye, X. Y., Chandrasekar, T., Goldberg, H., Klotz, L., Fleshner, N., Satkunasivam, R., Klaassen, Z. & Wallis, C. J. D., Oct 2020, In : Clinical Genitourinary Cancer. 18, 5, p. 343-350 8 p.

Research output: Contribution to journalReview article

3 Scopus citations
24 Scopus citations

Benjamin Alcock (1801-?) and his canal

Oelhafen, K., Shayota, B. J., Muhleman, M., Klaassen, Z., Tubbs, R. S. & Loukas, M., Sep 2013, In : Clinical Anatomy. 26, 6, p. 662-666 5 p.

Research output: Contribution to journalArticle

6 Scopus citations

Beyond biology: The impact of marital status on survival of patients with adrenocortical carcinoma

Klaassen, Z., Reinstatler, L., Terris, M. K., Underwood, W. & Moses, K. A., 2015, In : International Braz J Urol. 41, 6, p. 1108-1115 8 p.

Research output: Contribution to journalArticle

1 Scopus citations

Bilateral metachronous colon cancer metastasis to kidneys: A rare case with a treatment dilemma

Klaassen, Z., Prabhakar, R., Madi, R., Bruce Shingleton, W. & Terris, M. K., Feb 1 2013, In : UroToday International Journal. 6, 1

Research output: Contribution to journalArticle

1 Scopus citations

Body mass index and comorbidity are associated with postoperative renal function after nephrectomy

Reinstatler, L., Klaassen, Z., Barrett, B., Terris, M. K. & Moses, K. A., 2015, In : International Braz J Urol. 41, 4, p. 697-704 8 p.

Research output: Contribution to journalArticle

8 Scopus citations

Cancer diagnosis and risk of suicide after accounting for prediagnosis psychiatric care: A matched-cohort study of patients with incident solid-organ malignancies

Klaassen, Z., Wallis, C. J. D., Chandrasekar, T., Goldberg, H., Sayyid, R. K., Williams, S. B., Moses, K. A., Terris, M. K., Nam, R. K., Urbach, D., Austin, P. C., Kurdyak, P. & Kulkarni, G. S., Aug 15 2019, In : Cancer. 125, 16, p. 2886-2895 10 p.

Research output: Contribution to journalArticle

12 Scopus citations

Can post-treatment free PSA ratio be used to predict adverse outcomes in recurrent prostate cancer?

Goldberg, H., Glicksman, R., Woon, D., Hoffman, A., Shaikh, H., Chandrasekar, T., Klaassen, Z., Wallis, C. J. D., Ahmad, A. E., Sanmamed-Salgado, N., Qu, X., Moraes, F. Y., Diamandis, E. P., Berlin, A. & Fleshner, N. E., 2020, (Accepted/In press) In : BJU International.

Research output: Contribution to journalArticle

Case ‒ Foamy, high-grade prostatic intraepithelial neoplasia: A false positive for prostate cancer on multiparametric magnetic resonance imaging?

Chandrasekar, T., Goldberg, H., Klaassen, Z., Perlis, N., Finelli, A., Evans, A. & Ghai, S., May 2018, In : Canadian Urological Association Journal. 12, 5, p. E256-E259

Research output: Contribution to journalArticle

Changing Trends for Suicidal Death in Patients With Bladder Cancer: A 40+ Year Population-level Analysis

Klaassen, Z., Goldberg, H., Chandrasekar, T., Arora, K., Sayyid, R. K., Hamilton, R. J., Fleshner, N. E., Williams, S. B., Wallis, C. J. D. & Kulkarni, G. S., Jun 2018, In : Clinical Genitourinary Cancer. 16, 3, p. 206-212.e1

Research output: Contribution to journalArticle

13 Scopus citations

Characterization and outcomes of local treatment for primary bladder lymphoma: A population-based cohort analysis

Sellman, D. P., Simpson, W. G., Klaassen, Z., Jen, R. P., DiBianco, J. M., Reinstatler, L., Li, Q., Madi, R. H. & Terris, M. K., Jul 1 2018, In : Urology Annals. 10, 3, p. 249-253 5 p.

Research output: Contribution to journalArticle

4 Scopus citations

Clear cell adenocarcinoma of the prostate: A rare oncologic entity in a 42-year-old african american man

Klaassen, Z., Cleveland, C., McCraw, C. O., Burnette, J. O., Franken, A., Wilhelm, S., Kavuri, S. K., Biddinger, P. W., Terris, M. K. & Moses, K. A., Nov 1 2014, In : Urology. 84, 5, p. 997-1000 4 p.

Research output: Contribution to journalArticle

1 Scopus citations

Clinical Disparities for Minorities and Foreign-Born Men with Undescended Versus Descended Testicular Germ Cell Tumors

Klaassen, Z., Reinstatler, L., Wilson, S. N., Ellington, C., Li, Q., Terris, M. K. & Moses, K. A., Jun 1 2016, In : Clinical Genitourinary Cancer. 14, 3, p. e251-e255

Research output: Contribution to journalArticle

3 Scopus citations

Clinical-genomic Characterization Unveils More Aggressive Disease Features in Elderly Prostate Cancer Patients with Low-grade Disease

Goldberg, H., Spratt, D., Chandrasekar, T., Klaassen, Z., Wallis, C. J. D., Santiago-Jimenez, M., Fishbane, N., Davicioni, E., Noorani, R., Ahmad, A. E., Herrera Cáceres, J. O., Alibhai, S., Berlin, A. & Fleshner, N. E., Jan 1 2020, (Accepted/In press) In : European Urology Focus.

Research output: Contribution to journalArticle

Clinical outcome analysis of male and female genital burn injuries: A 15-year experience at a Level-1 Burn Center

Abel, N. J., Klaassen, Z., Mansour, E. H., Marano, M. A., Petrone, S. J., Houng, A. P. & Chamberlain, R. S., Apr 1 2012, In : International Journal of Urology. 19, 4, p. 351-358 8 p.

Research output: Contribution to journalArticle

10 Scopus citations

Clinical Parameters Outperform Molecular Subtypes for Predicting Outcome in Bladder Cancer: Results from Multiple Cohorts, Including TCGA

Morera, D. S., Hasanali, S. L., Belew, D., Ghosh, S., Klaassen, Z., Jordan, A. R., Wang, J., Terris, M. K., Bollag, R. J., Merseburger, A. S., Stenzl, A., Soloway, M. S. & Lokeshwar, V. B., Jan 1 2020, In : The Journal of urology. 203, 1, p. 62-72 11 p.

Research output: Contribution to journalArticle

5 Scopus citations

Comorbidity Is a Competing Factor for Disease Recurrence Postnephrectomy

Reinstatler, L., Klaassen, Z., Madi, R., Terris, M. K. & Moses, K. A., May 1 2017, In : Southern medical journal. 110, 5, p. 369-374 6 p.

Research output: Contribution to journalArticle

Comparison of Abiraterone Acetate and Docetaxel with Androgen Deprivation Therapy in High-risk and Metastatic Hormone-naïve Prostate Cancer: A Systematic Review and Network Meta-analysis

Wallis, C. J. D., Klaassen, Z. W. A., Bhindi, B., Goldberg, H., Chandrasekar, T., Farrell, A. M., Boorjian, S. A., Kulkarni, G. S., Karnes, R. J. & Satkunasivam, R., Jun 2018, In : European urology. 73, 6, p. 834-844 11 p.

Research output: Contribution to journalReview article

45 Scopus citations

Competing Risks of Mortality among Men with Biochemical Recurrence after Radical Prostatectomy

Daskivich, T. J., Howard, L. E., Amling, C. L., Aronson, W. J., Cooperberg, M. R., Kane, C. J., Klaassen, Z. W. A., Terris, M. K. & Freedland, S. J., Sep 1 2020, In : The Journal of urology. 204, 3, p. 511-517 7 p.

Research output: Contribution to journalArticle

Complex hepatobiliary surgery in the community setting: Is it safe and feasible?

Chamberlain, R. S., Klaassen, Z. W. A. & Paragi, P. R., Sep 1 2011, In : American Journal of Surgery. 202, 3, p. 273-280 8 p.

Research output: Contribution to journalArticle

1 Scopus citations

Complex Pancreatic Surgery: Safety and Feasibility in the Community Setting

Chamberlain, R. S., Tichauer, M., Klaassen, Z. & Paragi, P. R., Jan 1 2011, In : Journal of Gastrointestinal Surgery. 15, 1, p. 184-190 7 p.

Research output: Contribution to journalArticle

8 Scopus citations

Comprehensive assessment of the morbidity of renal mass biopsy: A populationbased assessment of biopsy-related complications

Garbens, A., Wallis, C. J. D., Klaassen, Z., Saskin, R., Plumptre, L., Kodama, R., Herschorn, S. & Nam, R. K., Jul 2020, In : Canadian Urological Association Journal. 15, 2

Research output: Contribution to journalArticle

Open Access

Contemporary cost-consequence analysis of blue light cystoscopy with hexaminolevulinate in non-muscle-invasive bladder cancer

Klaassen, Z. W. A., Li, K., Kassouf, W., Black, P. C., Dragomir, A. & Kulkarni, G. S., Jun 2017, In : Canadian Urological Association Journal. 11, 6, p. 173-181 9 p.

Research output: Contribution to journalArticle

4 Scopus citations

Continent Catheterizable Vesicostomy: An Alternative Surgical Modality for Pediatric Patients with Large Bladder Capacity

Peard, L., Fox, P. J., Andrews, W. M., Chen, R., McCraw, C. O., Klaassen, Z. W. A. & Neal, D. E., Jul 1 2016, In : Urology. 93, p. 217-222 6 p.

Research output: Contribution to journalArticle

2 Scopus citations

Decreasing incidence of venous thromboembolic events after radical cystectomy: Are we finally improving?

Harper, B. T., Wallis, C. J. D. & Klaassen, Z., Dec 1 2018, In : Translational Andrology and Urology. 7, p. S747-S750

Research output: Contribution to journalReview article

Decreasing suicide risk among patients with prostate cancer: Implications for depression, erectile dysfunction, and suicidal ideation screening

Klaassen, Z., Arora, K., Wilson, S. N., King, S. A., Madi, R., Neal, D. E., Kurdyak, P., Kulkarni, G. S., Lewis, R. W. & Terris, M. K., Feb 2018, In : Urologic Oncology: Seminars and Original Investigations. 36, 2, p. 60-66 7 p.

Research output: Contribution to journalReview article

21 Scopus citations

Diagnostic utility of axial imaging in the evaluation of hematuria: A systematic review and critical appraisal of the literature

Wallis, C. J. D., Sayyid, R. K., Manyevitch, R., Perlis, N., Lokeshwar, V. B., Fleshner, N. E., Terris, M. K., Nielsen, M. E. & Klaassen, Z. W. A., Jul 2020, In : Canadian Urological Association Journal. 15, 2

Research output: Contribution to journalReview article

Open Access