TitleAssociate Professor
InstitutionBaylor College of Medicine
DepartmentDepartment of Urology
Address6701 FANNIN
Houston, TX 77030
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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Faculty can login to make corrections and additions.
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    PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Stewart CA, Jeong Kim S, Phillips D, Bhatia V, Janzen N, Gerber JA. Urologic practice patterns of pediatricians: a survey from a large multisite pediatric care center. Front Pediatr. 2023; 11:1278782. PMID: 38125822; PMCID: PMC10731033.
    2. Bachtel HA, Flores H, Park B, Kim SJ, Koh CJ, Janzen NK. Evaluating the utility of routine urine culture and antibiotic treatment in children with neurogenic bladder undergoing intradetrusor OnabotulinumtoxinA injection. J Pediatr Urol. 2023 12; 19(6):742.e1-742.e8. PMID: 37537091.
      Citations:    Fields:    Translation:Humans
    3. Bachtel HA, Hussaini SH, Austin PF, Janzen NK, Chau A, Pezeshkmehr A, Nguyen Galvan NT, Brewer ED, Swartz S, Hernandez JA, Gardner G, Cotton RT, O'Mahony CA, Koh CJ, Kukreja KU. Ureteral stricture after pediatric kidney transplantation: Is there a role for percutaneous antegrade ureteroplasty? J Pediatr Urol. 2023 06; 19(3):296.e1-296.e8. PMID: 36750396.
      Citations:    Fields:    Translation:Humans
    4. Vemulakonda VM, Janzen N, Hittelman AB, Deakyne Davies S, Sevick C, Richardson AC, Schissel J, Dash D, Hintz R, Grider R, Adams P, Buck M, King J, Ewing E, Beltran G, Corbett S, Chiang G. Feasibility of establishing a multi-center research database using the electronic health record: The PURSUIT network. J Pediatr Urol. 2022 12; 18(6):788.e1-788.e8. PMID: 35644792.
      Citations:    Fields:    
    5. Dhanji S, Borregales LD, Janzen NK, Godoy G, Fuller MY, Au JK. Infant prostatic Rhabdomyosarcoma: A diagnostic and therapeutic challenge. Urol Case Rep. 2022 Jul; 43:102116. PMID: 35646598; PMCID: PMC9133547.
    6. Lee DG, Gerber J, Bhatia V, Janzen N, Austin PF, Koh CJ, Song SH. A Prospective Comparative Study of Mobile Acoustic Uroflowmetry and Conventional Uroflowmetry. Int Neurourol J. 2021 Dec; 25(4):355-363. PMID: 34991305; PMCID: PMC8748308.
    7. Vemulakonda VM, Sevick C, Juarez-Colunga E, Chiang G, Janzen N, Saville A, Adams P, Beltran G, King J, Ewing E, Kempe A. Treatment of infants with ureteropelvic junction obstruction: findings from the PURSUIT network. Int Urol Nephrol. 2021 Aug; 53(8):1485-1495. PMID: 33948809; PMCID: PMC8282718.
      Citations:    Fields:    Translation:Humans
    8. Johnson EK, Chalmers DJ, Nelson CP, Li I, Iwaniuk M, Grant C, Byrd C, Rangel SJ, Saito JM, Barnhart DC, Hall BL, Vemulakonda VM, Groth TW, Ellison JS, Janzen NK, Hittelman AB, DiCarlo HN, Merguerian PA, Tanaka ST, Prasad MM. Reply by Authors. J Urol. 2021 04; 205(4):1198. PMID: 33502262.
      Citations:    Fields:    
    9. Adler AC, Chandrakantan A, Lee AD, Koh CJ, Janzen NK, Austin PF. Effect of Caudal vs. Penile Block on the Incidence of Hypospadias Complications Following Primary Repairs: A Retrospective Cohort Study. J Urol. 2021 May; 205(5):1454-1459. PMID: 33347774.
      Citations:    Fields:    Translation:Humans
    10. Johnson EK, Chalmers DJ, Nelson CP, Li I, Iwaniuk M, Grant C, Byrd C, Rangel SJ, Saito JM, Barnhart DC, Hall BL, Vemulakonda VM, Groth TW, Ellison JS, Janzen NK, Hittelman AB, DiCarlo HN, Merguerian PA, Tanaka ST, Prasad MM. Antireflux Surgery at National Surgical Quality Improvement Program-Pediatric Hospitals. J Urol. 2021 04; 205(4):1189-1198. PMID: 33207139.
      Citations: 1     Fields:    Translation:Humans
    11. Adler AC, Chandrakantan A, Sawires Y, Lee AD, Hart M, Koh CJ, Janzen NK, Austin PF, Andropoulos DB. Analysis of 1478 Cases of Hypospadias Repair: The Incidence of Requiring Repeated Anesthetic Exposure as Well as Exploration of the Involvement of Trainees on Case Duration. Anesth Analg. 2020 11; 131(5):1551-1556. PMID: 33079878.
      Citations:    Fields:    Translation:Humans
    12. Elizondo RA, Au JK, Song SH, Huang GO, Zhang W, Zhu H, Janzen N, Seth A, Roth DR, Tu DT, Koh CJ. Open versus robot-assisted laparoscopic ureteral reimplantation: Hospital charges analysis and outcomes at a single institution. J Pediatr Surg. 2020 Jan 09. PMID: 31955989.
      Citations: 1     Fields:    
    13. Vemulakonda VM, Chiang G, Sevick CJ, Janzen NK. Variations in Adherence to American Urological Association Guidelines for Followup of Children with Vesicoureteral Reflux. Urol Pract. 2020 Nov; 7(6):490-495. PMID: 37287157.
      Citations: 1     
    14. Sheth KR, White JT, Perez-Orozco AF, Debolske ND, Hyde CR, Geistkemper C, Roth DR, Austin PF, Gonzales ET, Janzen NK, Tu DD, Mittal AG, Koh CJ, Ryan SL, Jorgez C, Seth A. Evaluating Natural History and Follow Up Strategies for Non-obstructive Urolithiasis in Pediatric Population. Front Pediatr. 2018; 6:353. PMID: 30505832; PMCID: PMC6250749.
      Citations: 1     
    15. White JT, Sheth KR, Bilgutay AN, Roth DR, Austin PF, Gonzales ET, Janzen NK, Tu DD, Mittal AG, Koh CJ, Ryan SL, Jorgez C, Seth A. Corrigendum: Vesicoamniotic Shunting Improves Outcomes in a Subset of Prune Belly Syndrome Patients at a Single Tertiary Center. Front Pediatr. 2018; 6:229. PMID: 30140665; PMCID: PMC6102447.
      Citations: 1     
    16. Sheth KR, White JT, Janzen N, Koh CJ, Austin PF, Roth DR, Tu DD, Mittal A, Wang MH, Gonzales ET, Jorgez C, Seth A. Evaluating Outcomes of Differential Surgical Management of Nonfunctioning Upper Pole Renal Moieties in Duplex Collecting Systems. Urology. 2019 01; 123:198-203. PMID: 30031832.
      Citations: 3     Fields:    Translation:Humans
    17. Baek M, Silay MS, Au JK, Huang GO, Elizondo RA, Puttmann KT, Janzen NK, Seth A, Roth DR, Koh CJ. Does the use of 5?mm instruments affect the outcomes of robot-assisted laparoscopic pyeloplasty in smaller working spaces? A comparative analysis of infants and older children. J Pediatr Urol. 2018 12; 14(6):537.e1-537.e6. PMID: 30007500.
      Citations: 10     Fields:    Translation:Humans
    18. White JT, Sheth KR, Bilgutay AN, Roth DR, Austin PF, Gonzales ET, Janzen NK, Tu DD, Mittal AG, Koh CJ, Ryan SL, Jorgez C, Seth A. Vesicoamniotic Shunting Improves Outcomes in a Subset of Prune Belly Syndrome Patients at a Single Tertiary Center. Front Pediatr. 2018; 6:180. PMID: 30018947; PMCID: PMC6038357.
      Citations: 2     
    19. Baek M, Silay MS, Au JK, Huang GO, Elizondo RA, Puttmann K, Janzen NK, Seth A, Roth DR, Koh CJ. Quantifying the Additional Difficulty of Pediatric Robot-Assisted Laparoscopic Re-Do Pyeloplasty: A Comparison of Primary and Re-Do Procedures. J Laparoendosc Adv Surg Tech A. 2018 May; 28(5):610-616. PMID: 29406807.
      Citations: 5     Fields:    Translation:Humans
    20. Hulten KG, Janzen NK, Kaplan SL, Foster CE. Pediatric Prostatic Abscess Caused by Methicillin-susceptible Staphylococcus aureus. Pediatr Infect Dis J. 2017 04; 36(4):426-427. PMID: 27977556.
      Citations: 4     Fields:    Translation:HumansCells
    21. Sack BS, Elizondo RA, Huang GO, Janzen N, Espinoza J, Sanz-Cortes M, Dietrich JE, Hakim J, Richardson ES, Oden M, Hanks J, Haridas B, Hury JF, Koh CJ. Pediatric medical device development by surgeons via capstone engineering design programs. J Pediatr Surg. 2018 Mar; 53(3):493-498. PMID: 28196661; PMCID: PMC5545169.
      Citations: 3     Fields:    Translation:Humans
    22. Au JK, Graziano C, Elizondo RA, Ryan S, Roth DR, Koh CJ, Gonzales ET, Tu DT, Janzen N, Naik S, Seth A. Urologic Outcomes of Children With Hemorrhagic Cystitis After Bone Marrow Transplant at a Single Institution. Urology. 2017 Mar; 101:126-132. PMID: 27793653.
      Citations: 2     Fields:    Translation:Humans
    23. Bekheirnia MR, Bekheirnia N, Bainbridge MN, Gu S, Coban Akdemir ZH, Gambin T, Janzen NK, Jhangiani SN, Muzny DM, Michael M, Brewer ED, Elenberg E, Kale AS, Riley AA, Swartz SJ, Scott DA, Yang Y, Srivaths PR, Wenderfer SE, Bodurtha J, Applegate CD, Velinov M, Myers A, Borovik L, Craigen WJ, Hanchard NA, Rosenfeld JA, Lewis RA, Gonzales ET, Gibbs RA, Belmont JW, Roth DR, Eng C, Braun MC, Lupski JR, Lamb DJ. Whole-exome sequencing in the molecular diagnosis of individuals with congenital anomalies of the kidney and urinary tract and identification of a new causative gene. Genet Med. 2017 04; 19(4):412-420. PMID: 27657687; PMCID: PMC5362362.
      Citations: 36     Fields:    Translation:Humans
    24. Afsarlar CE, Ryan SL, Donel E, Baccam TH, Jones B, Chandwani B, Au J, Huang GO, Gonzales ET, Janzen N, Tu D, Seth A, Roth DR, Koh CJ. Standardized process to improve patient flow from the Emergency Room to the Operating Room for pediatric patients with testicular torsion. J Pediatr Urol. 2016 Aug; 12(4):233.e1-4. PMID: 27270069.
      Citations: 4     Fields:    Translation:Humans
    25. Bilgutay AN, Roth DR, Gonzales ET, Janzen N, Zhang W, Koh CJ, Gargollo P, Seth A. Posterior urethral valves: Risk factors for progression to renal failure. J Pediatr Urol. 2016 Jun; 12(3):179.e1-7. PMID: 26705688; PMCID: PMC4882264.
      Citations: 9     Fields:    Translation:Humans
    26. Stanasel I, Le HK, Bilgutay A, Roth DR, Gonzales ET, Janzen N, Koh CJ, Gargollo P, Seth A. Complications following Staged Hypospadias Repair Using Transposed Preputial Skin Flaps. J Urol. 2015 Aug; 194(2):512-6. PMID: 25701546; PMCID: PMC4509837.
      Citations: 25     Fields:    Translation:Humans
    27. Mansouri R, Sander JC, Janzen NK, Dietrich JE. A Case of Obstructed Hemivagina with Ectopic Ureter Leading to Severe Hydrocolpos and Contralateral Renal Outflow Tract Obstruction in a Neonate. J Pediatr Adolesc Gynecol. 2015 Oct; 28(5):e131-3. PMID: 26049936.
      Citations: 1     Fields:    Translation:Humans
    28. Sander JC, Bilgutay AN, Stanasel I, Koh CJ, Janzen N, Gonzales ET, Roth DR, Seth A. Outcomes of endoscopic incision for the treatment of ureterocele in children at a single institution. J Urol. 2015 Feb; 193(2):662-6. PMID: 25167992; PMCID: PMC4549155.
      Citations: 6     Fields:    Translation:Humans
    29. Shvarts O, Janzen N, Lam JS, Leppert JT, Caliliw R, Figlin RA, Belldegrun AS, Zeng G. RENCA/carbonic anhydrase-IX: a murine model of a carbonic anhydrase-IX-expressing renal cell carcinoma. Urology. 2006 Nov; 68(5):1132-8. PMID: 17095063.
      Citations: 6     Fields:    Translation:Animals
    30. Janzen NK, Han KR, Perry KT, Said JW, Schulam PG, Belldegrun AS. Feasibility of nerve-sparing prostate cryosurgery: applications and limitations in a canine model. J Endourol. 2005 May; 19(4):520-5. PMID: 15910269.
      Citations: 5     Fields:    Translation:Animals
    31. Kim HL, Seligson D, Liu X, Janzen N, Bui MH, Yu H, Shi T, Belldegrun AS, Horvath S, Figlin RA. Using tumor markers to predict the survival of patients with metastatic renal cell carcinoma. J Urol. 2005 May; 173(5):1496-501. PMID: 15821467.
      Citations: 62     Fields:    Translation:Humans
    32. Janzen NK, Perry KT, Han KR, Kristo B, Raman S, Said JW, Belldegrun AS, Schulam PG. The effects of intentional cryoablation and radio frequency ablation of renal tissue involving the collecting system in a porcine model. J Urol. 2005 Apr; 173(4):1368-74. PMID: 15758807.
      Citations: 29     Fields:    Translation:Animals
    33. Han KR, Janzen NK, McWhorter VC, Kim HL, Pantuck AJ, Zisman A, Figlin RA, Dorey FJ, Said JW, Belldegrun AS. Cystic renal cell carcinoma: biology and clinical behavior. Urol Oncol. 2004 Sep-Oct; 22(5):410-4. PMID: 15464922.
      Citations: 17     Fields:    Translation:Humans
    34. Kim HL, Seligson D, Liu X, Janzen N, Bui MH, Yu H, Shi T, Figlin RA, Horvath S, Belldegrun AS. Using protein expressions to predict survival in clear cell renal carcinoma. Clin Cancer Res. 2004 Aug 15; 10(16):5464-71. PMID: 15328185.
      Citations: 63     Fields:    Translation:Humans
    35. Mukouyama H, Janzen NK, Hernandez JM, Lam JS, Caliliw R, Wang AY, Figlin RA, Belldegrun AS, Zeng G. Generation of kidney cancer-specific antitumor immune responses using peripheral blood monocytes transduced with a recombinant adenovirus encoding carbonic anhydrase 9. Clin Cancer Res. 2004 Feb 15; 10(4):1421-9. PMID: 14977845.
      Citations: 7     Fields:    Translation:HumansCells
    36. Han KR, Bleumer I, Pantuck AJ, Kim HL, Dorey FJ, Janzen NK, Zisman A, Dinney CP, Wood CG, Swanson DA, Said JW, Figlin RA, Mulders PF, Belldegrun AS. Validation of an integrated staging system toward improved prognostication of patients with localized renal cell carcinoma in an international population. J Urol. 2003 Dec; 170(6 Pt 1):2221-4. PMID: 14634383.
      Citations: 17     Fields:    Translation:Humans
    37. Janzen NK, Kim HL, Figlin RA, Belldegrun AS. Surveillance after radical or partial nephrectomy for localized renal cell carcinoma and management of recurrent disease. Urol Clin North Am. 2003 Nov; 30(4):843-52. PMID: 14680319.
      Citations: 275     Fields:    Translation:Humans
    38. Janzen NK, Laifer-Narin S, Han KR, Seltzer M, Thomas MA, Pantuck AJ, Belldegrun AS. Emerging technologies in uroradiologic imaging. Urol Oncol. 2003 Sep-Oct; 21(5):317-26. PMID: 14670537.
      Citations: 3     Fields:    Translation:Humans
    39. Han KR, Bui MH, Pantuck AJ, Freitas DG, Leibovich BC, Dorey FJ, Zisman A, Janzen NK, Mukouyama H, Figlin RA, Belldegrun AS. TNM T3a renal cell carcinoma: adrenal gland involvement is not the same as renal fat invasion. J Urol. 2003 Mar; 169(3):899-903; discussion 903-4. PMID: 12576809.
      Citations: 17     Fields:    Translation:Humans
    40. Janzen NK, Perry KT, Schulam PG. Laparoscopic radical nephrectomy and minimally invasive surgery for kidney cancer. Cancer Treat Res. 2003; 116:99-117. PMID: 14650828.
      Citations: 5     Fields:    Translation:Humans
    41. Janzen N, Zisman A, Pantuck AJ, Perry K, Schulam P, Belldegrun AS. Minimally invasive ablative approaches in the treatment of renal cell carcinoma. Curr Urol Rep. 2002 Feb; 3(1):13-20. PMID: 12084214.
      Citations: 8     Fields:    Translation:Humans
    42. Perry K, Zisman A, Pantuck AJ, Janzen N, Schulam P, Belldegrun AS. Laparoscopic and percutaneous ablative techniques in the treatment of renal cell carcinoma. Rev Urol. 2002; 4(3):103-11. PMID: 16985666; PMCID: PMC1475990.
      Citations: 3     
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