Ryan Lokken, MD

Title(s)Associate Professor, Radiology
SchoolSchool of Medicine
Address505 Parnassus Avenue, #L308B
San Francisco CA 94117
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    R. Peter Lokken earned his Master’s degree in Public Health at the Harvard School of Public Health (2006) and his MD (2007) from Harvard Medical School in Boston, MA. He completed a one-year Internal Medicine internship at UC San Diego (2008). Lokken’s four-year diagnostic radiology residency was at the Brigham and Women’s Hospital in Boston, MA (2008-2012). Lokken completed a one-year Interventional Radiology fellowship at UCSF in 2013. In 2013, he joined the University of Illinois Hospital Health & Science Center in Chicago as a radiologist specializing in vascular interventional radiology. In June 2018, he rejoined UCSF as an assistant professor of clinical radiology in the department’s Interventional Section.

    Lokken is an associate editor for the Journal of Vascular and Interventional Radiology, the scientific journal of the Society for Interventional Radiology. His research focus is the investigation of clinical, genetic and immunological factors associated with outcomes of locoregional therapy for hepatocellular carcinoma and other malignancies.

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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help. to make corrections and additions.
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    1. Bilateral dual iliac screw pelvic fixation for adult spinal deformity: a case report of a superior gluteal artery pseudoaneurysm secondary to aberrant iliac screw trajectory. Spine Deform. 2023 Oct 26. Khela M, Kasir R, Lokken RP, Clark AJ, Theologis AA. PMID: 37882967.
      View in: PubMed   Mentions:    Fields:    
    2. Cost-effectiveness analysis of interventional liver-directed therapies for downstaging of HCC before liver transplant. Liver Transpl. 2023 Aug 29. Wu X, Kwong A, Heller M, Lokken RP, Fidelman N, Mehta N. PMID: 37639286.
      View in: PubMed   Mentions:    Fields:    
    3. Malposition of a Femoral Tunneled Dialysis Catheter through a Patent Foramen Ovale. Semin Intervent Radiol. 2023 Jun; 40(3):304-307. Blackburn AF, Landinez GP, Kerlan RK, Lokken RP. PMID: 37484443; PMCID: PMC10359127.
      View in: PubMed   Mentions:
    4. Optimal treatment for small HCC (<3 cm): Resection, liver transplantation, or locoregional therapy? JHEP Rep. 2023 Aug; 5(8):100781. Wu X, Lokken RP, Mehta N. PMID: 37456674; PMCID: PMC10339255.
      View in: PubMed   Mentions:
    5. Socioeconomic and Survival Analysis of Radioembolization in Patients with Intrahepatic Cholangiocarcinoma: A Propensity Score-Adjusted Study. J Vasc Interv Radiol. 2023 05; 34(5):815-823.e1. Wu X, Heller M, Lokken RP, Fidelman N, Lam A. PMID: 36693521.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    6. Influence of progestin-only hormonal use on hepatocellular adenomas: A retrospective cohort study. Contraception. 2023 03; 119:109915. Qureshy Z, Lokken RP, Kakar S, Grab J, Mehta N, Sarkar M. PMID: 36476331; PMCID: PMC10266542.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    7. Clinical Outcomes and Patency after Transjugular Intrahepatic Portosystemic Shunt Reduction for Overshunting Adverse Events. J Vasc Interv Radiol. 2022 12; 33(12):1507-1512. Shah RJ, Alqadi MM, Duvvuri M, Kim YJ, Tyagi R, Lokken RP, Gaba RC. PMID: 35964879.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    8. Pharmacokinetics and Early Tumor Response to Conventional Transarterial Chemoembolization with Sorafenib and Doxorubicin in a VX2 Rabbit Tumor Model. J Vasc Interv Radiol. 2022 10; 33(10):1213-1221.e5. Elkhadragy L, Khabbaz RC, Muchiri RN, Totura WM, Samuelson JP, Whiteley HE, van Breemen RB, Lokken RP, Gaba RC. PMID: 35850455.
      View in: PubMed   Mentions:    Fields:    Translation:Animals
    9. Large thrombosed portomesenteric venous aneurysm treated with pharmacomechanical thrombolysis combined with TIPS placement. CVIR Endovasc. 2022 Feb 08; 5(1):11. Kohlbrenner R, Schwertner AB, Vogel AR, Conrad M, Lokken RP. PMID: 35133515; PMCID: PMC8825927.
      View in: PubMed   Mentions: 1  
    10. Nonoperative Management of Unstable Patients with Solid Organ Injury: An Incompletely Mapped Frontier. J Vasc Interv Radiol. 2021 08; 32(8):1156-1157. Lokken RP, Conrad MB. PMID: 34332716.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    11. Accuracy of Disclosed Financial Relationships between Radiologists and Industry at the 2018 RSNA Annual Meeting. Radiology. 2021 08; 300(2):433-435. Speir EJ, Hills NK, Lokken RP. PMID: 34100685; PMCID: PMC8437048.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    12. Conventional versus drug-eluting embolic transarterial chemoembolization with doxorubicin: comparative drug delivery, pharmacokinetics, and treatment response in a rabbit VX2 tumor model. Drug Deliv Transl Res. 2022 05; 12(5):1105-1117. Gaba RC, Khabbaz RC, Muchiri RN, Morrison JD, Elkhadragy L, Totura WM, Samuelson JP, Whiteley HE, Deaton RL, Nguyen PL, Sverdlov M, Johnson JJ, van Breemen RB, Lokken RP. PMID: 33861419.
      View in: PubMed   Mentions: 3     Fields:    Translation:Animals
    13. Hepatic Toxicity After Selective Chemoembolization Is Associated With Decreased Survival Among Patients With Hepatocellular Carcinoma. AJR Am J Roentgenol. 2021 05; 216(5):1283-1290. Lokken RP, Kerlan RK, Chung YC, Chen YF, Mehta NJ, Yao FY, Fidelman N. PMID: 33703926.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    14. Nonfibered Packing Coil Embolization of Pulmonary Artery Pseudoaneurysm Resulting in a Delayed Endobronchial Coil Migration. J Vasc Interv Radiol. 2021 04; 32(4):626-628. Schwertner A, Kohlbrenner RM, Seeley EJ, Lokken RP. PMID: 33526345.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    15. Catheter-Directed Thrombolysis for Submassive Pulmonary Embolism in the Third Trimester of Pregnancy. JACC Case Rep. 2020 Oct; 2(12):1899-1904. Compadre AJ, Kohi M, Lokken RP, Blissett S, Harris IS, Lucero J, Rosenstein MG, Sobhani NC. PMID: 34317077; PMCID: PMC8299248.
      View in: PubMed   Mentions: 3  
    16. Embolization of Arterial-Portal Fistula to Treat Associated Hemobilia after Transjugular Liver Biopsy. Semin Intervent Radiol. 2020 Oct; 37(4):430-433. Losey AD, Lokken RP, Kolli KP, Kerlan RK, Taylor AG, Kohi MP. PMID: 33041491; PMCID: PMC7540633.
      View in: PubMed   Mentions:
    17. Intermediate to Long-Term Clinical Outcomes of Percutaneous Cryoablation for Renal Masses. J Vasc Interv Radiol. 2020 Aug; 31(8):1242-1248. Knox J, Kohlbrenner R, Kolli K, Fidelman N, Kohi MP, Lehrman E, Lokken RP, Zagoria R, Kerlan RK, LaBerge J, Taylor AG. PMID: 32522505.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    18. Esophagopulmonary fistula causing pulmonary arterial pseudoaneurysms and massive hemoptysis. Radiol Case Rep. 2020 Jul; 15(7):914-920. Kord A, James E, Herren J, Gaba RC, Lokken RP. PMID: 32382378; PMCID: PMC7201158.
      View in: PubMed   Mentions:
    19. Overdilation of a 6-mm Self-Expanding Stent with a 10-mm Balloon-Expandable Stent Graft Preserves Failing Meso-Rex Bypass. J Vasc Interv Radiol. 2020 03; 31(3):521-523. Koethe Y, Lokken RP, Lehrman ED, Kerlan RK, Roberts JP, Rhee SJ, Kohi MP, Kolli KP. PMID: 32007411.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    20. Histology of Hepatocellular Carcinoma: Association with Clinical Features, Radiological Findings, and Locoregional Therapy Outcomes. J Clin Imaging Sci. 2019; 9:52. Park BV, Gaba RC, Huang YH, Chen YF, Guzman G, Lokken RP. PMID: 31819829; PMCID: PMC6884980.
      View in: PubMed   Mentions: 2  
    21. Arterial-portal fistula treated with hepatic arterial embolization and portal venous aneurysm stent-graft exclusion complicated by type 2 endoleak. Radiol Case Rep. 2019 Oct; 14(10):1301-1305. Bremer WA, Lokken RP, Gaba RC, Bui JT. PMID: 31467626; PMCID: PMC6710638.
      View in: PubMed   Mentions: 2  
    22. Locoregional Therapy of Hepatocellular-Cholangiocarcinoma versus Hepatocellular Carcinoma: A Propensity Score-Matched Study. J Vasc Interv Radiol. 2019 Sep; 30(9):1317-1324. Huang YH, Park BV, Chen YF, Gaba RC, Guzman G, Lokken RP. PMID: 31375450.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    23. Tissue plasminogen activator dose and pulmonary artery pressure reduction in catheter directed thrombolysis of submassive pulmonary embolism. PLoS One. 2019; 14(2):e0211701. Patel DC, Gaba RC, Liu L, Lokken RP. PMID: 30726288; PMCID: PMC6364916.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    24. Transhepatic Revision of Occluded Transjugular Intrahepatic Portosystemic Shunt Complicated by Endotipsitis. Semin Intervent Radiol. 2018 Dec; 35(5):492-496. Darrow AW, Gaba RC, Lokken RP. PMID: 30728666; PMCID: PMC6363548.
      View in: PubMed   Mentions: 3  
    25. Development and Angiographic Use of the Rabbit VX2 Model for Liver Cancer. J Vis Exp. 2019 01 07; (143). Khabbaz RC, Huang YH, Smith AA, Garcia KD, Lokken RP, Gaba RC. PMID: 30663668.
      View in: PubMed   Mentions: 7     Fields:    Translation:Animals
    26. Eight Years' Experience With a Radiology-Sponsored Medical Student Research Fellowship Program. J Am Coll Radiol. 2019 Feb; 16(2):224-227. Gaba RC, Lokken RP, Zwanziger J, Girotti JA, Ray CE, Kashima K. PMID: 30420238.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    27. Characterization of an Inducible Alcoholic Liver Fibrosis Model for Hepatocellular Carcinoma Investigation in a Transgenic Porcine Tumorigenic Platform. J Vasc Interv Radiol. 2018 08; 29(8):1194-1202.e1. Gaba RC, Mendoza-Elias N, Regan DP, Garcia KD, Lokken RP, Schwind RM, Eichner M, Thomas FM, Rund LA, Schook LB, Schachtschneider KM. PMID: 29887183; PMCID: PMC6388685.
      View in: PubMed   Mentions: 6     Fields:    Translation:Animals
    28. 90Y Radioembolization for Hepatic Malignancy in Patients with Previous Biliary Intervention: Multicenter Analysis of Hepatobiliary Infections. Radiology. 2018 Sep; 288(3):774-781. Devulapalli KK, Fidelman N, Soulen MC, Miller M, Johnson MS, Addo E, El-Haddad G, Nutting C, Morrison J, Farsad K, Lokken RP, Gaba RC, Fleming J, Brown DB, Kwan SW, Rose SC, Pennycooke KA, Liu DM, White SB, Gandhi R, Lazar AA, Kerlan RK. PMID: 29737954.
      View in: PubMed   Mentions: 8     Fields:    Translation:Humans
    29. Albumin-Bilirubin and Platelet-Albumin-Bilirubin Grades Do Not Predict Survival After Transjugular Intrahepatic Portosystemic Shunt Creation. Cardiovasc Intervent Radiol. 2018 Jul; 41(7):1029-1034. Khabbaz RC, Lokken RP, Chen YF, Lipnik AJ, Bui JT, Ray CE, Gaba RC. PMID: 29516241.
      View in: PubMed   Mentions: 8     Fields:    Translation:HumansCells
    30. Gastric Varices Bleed at Lower Portosystemic Pressure Gradients than Esophageal Varices. J Vasc Interv Radiol. 2018 May; 29(5):636-641. Morrison JD, Mendoza-Elias N, Lipnik AJ, Lokken RP, Bui JT, Ray CE, Gaba RC. PMID: 29352698.
      View in: PubMed   Mentions: 11     Fields:    Translation:Humans
    31. Liver Masses: What Physicians Need to Know About Ordering and Interpreting Liver Imaging. Curr Gastroenterol Rep. 2017 Oct 18; 19(11):58. Sheybani A, Gaba RC, Lokken RP, Berggruen SM, Mar WA. PMID: 29044439.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    32. Albumin-Bilirubin and Platelet-Albumin-Bilirubin Grades Accurately Predict Overall Survival in High-Risk Patients Undergoing Conventional Transarterial Chemoembolization for Hepatocellular Carcinoma. J Vasc Interv Radiol. 2017 Sep; 28(9):1224-1231.e2. Hansmann J, Evers MJ, Bui JT, Lokken RP, Lipnik AJ, Gaba RC, Ray CE. PMID: 28688815.
      View in: PubMed   Mentions: 25     Fields:    Translation:HumansCells
    33. Quality Improvement Guidelines for Transarterial Chemoembolization and Embolization of Hepatic Malignancy. J Vasc Interv Radiol. 2017 09; 28(9):1210-1223.e3. Gaba RC, Lokken RP, Hickey RM, Lipnik AJ, Lewandowski RJ, Salem R, Brown DB, Walker TG, Silberzweig JE, Baerlocher MO, Echenique AM, Midia M, Mitchell JW, Padia SA, Ganguli S, Ward TJ, Weinstein JL, Nikolic B, Dariushnia SR, Society of Interventional Radiology Standards of Practice Committee. PMID: 28669744.
      View in: PubMed   Mentions: 45     Fields:    Translation:Humans
    34. Liver Track Embolization After Islet Cell Transplant: Comparison of Two Techniques. AJR Am J Roentgenol. 2017 May; 208(5):1134-1140. Gaba RC, Kobayashi KR, Bui JT, Lokken RP, Lipnik AJ, Ray CE, Oberholzer J. PMID: 28436697.
      View in: PubMed   Mentions: 6     Fields:    Translation:Humans
    35. Does advanced chronic kidney disease impact transjugular intrahepatic portosystemic shunt efficacy and safety? Acta Gastroenterol Belg. 2017 Apr-Jun; 80(2):243-248. Lakhoo J, Gunasekaran SS, Lokken RP, Lipnik AJ, Ray CE, Bui JT, Gaba RC. PMID: 29560689.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    36. Liver Infarction after Drug-Eluting Embolic Transarterial Chemoembolization for Hepatocellular Carcinoma in the Setting of a Large Portosystemic Shunt. Semin Intervent Radiol. 2016 Dec; 33(4):337-341. Park BV, Gaba RC, Lokken RP. PMID: 27904254; PMCID: PMC5088095.
      View in: PubMed   Mentions: 2  
    37. Filter Eversion Technique for Removal of Option ELITE Inferior Vena Cava Filters. J Vasc Interv Radiol. 2016 Nov; 27(11):1718-1720. Vyas AR, Bui JT, Ray CE, Lokken RP, Gaba RC. PMID: 27926394.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    38. Safety and Efficacy of Doxorubicin Drug-Eluting Embolic Chemoembolization of Hepatocellular Carcinoma Supplied by Extrahepatic Collateral Arteries. J Vasc Interv Radiol. 2016 Nov; 27(11):1698-1704. Lokken RP, Fidelman N, Kolli KP, Kerlan RK. PMID: 27397617.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    39. Validity of Newborn Clinical Assessment to Determine Gestational Age in Bangladesh. Pediatrics. 2016 07; 138(1). Lee AC, Mullany LC, Ladhani K, Uddin J, Mitra D, Ahmed P, Christian P, Labrique A, DasGupta SK, Lokken RP, Quaiyum M, Baqui AH, Projahnmo Study Group. PMID: 27313070; PMCID: PMC4925072.
      View in: PubMed   Mentions: 28     Fields:    Translation:HumansPHPublic Health
    40. Transjugular Intrahepatic Portosystemic Shunt Creation and Variceal Coil or Plug Embolization Ineffectively Attain Gastric Variceal Decompression or Occlusion: Results of a 26-Patient Retrospective Study. J Vasc Interv Radiol. 2016 07; 27(7):1001-11. Lakhoo J, Bui JT, Lokken RP, Ray CE, Gaba RC. PMID: 27106732.
      View in: PubMed   Mentions: 12     Fields:    Translation:Humans
    41. Advanced Stent Graft Treatment of Venous Stenosis Affecting Hemodialysis Vascular Access: Case Illustrations. Semin Intervent Radiol. 2016 Mar; 33(1):39-45. Patel D, Ray CE, Lokken RP, Bui JT, Lipnik AJ, Gaba RC. PMID: 27011426; PMCID: PMC4803512.
      View in: PubMed   Mentions: 2  
    42. Root Cause Analysis of Rebleeding Events following Transjugular Intrahepatic Portosystemic Shunt Creation for Variceal Hemorrhage. J Vasc Interv Radiol. 2015 Oct; 26(10):1444-53. Lakhoo J, Bui JT, Zivin SP, Lokken RP, Minocha J, Ray CE, Gaba RC. PMID: 26239896.
      View in: PubMed   Mentions: 6     Fields:    Translation:Humans
    43. Diagnostic yield of CT urography in the evaluation of young adults with hematuria. AJR Am J Roentgenol. 2012 Mar; 198(3):609-15. Lokken RP, Sadow CA, Silverman SG. PMID: 22358000.
      View in: PubMed   Mentions: 8     Fields:    Translation:Humans
    44. Air pollution and risk of stroke: underestimation of effect due to misclassification of time of event onset. Epidemiology. 2009 Jan; 20(1):137-42. Lokken RP, Wellenius GA, Coull BA, Burger MR, Schlaug G, Suh HH, Mittleman MA. PMID: 19244659; PMCID: PMC2888684.
      View in: PubMed   Mentions: 36     Fields:    Translation:HumansPHPublic Health
    45. Inflammatory nodules mimic applicator track seeding after percutaneous ablation of renal tumors. AJR Am J Roentgenol. 2007 Oct; 189(4):845-8. Lokken RP, Gervais DA, Arellano RS, Tuncali K, Morrison PR, Tatli S, Mueller PR, Silverman SG. PMID: 17885054.
      View in: PubMed   Mentions: 15     Fields:    Translation:Humans
    46. Physical activity of moderate intensity and risk of type 2 diabetes: a systematic review. Diabetes Care. 2007 Mar; 30(3):744-52. Jeon CY, Lokken RP, Hu FB, van Dam RM. PMID: 17327354.
      View in: PubMed   Mentions: 261     Fields:    Translation:Humans
    47. Assembly of the U1 snRNP involves interactions with the backbone of the terminal stem of U1 snRNA. RNA. 2003 Feb; 9(2):193-201. McConnell TS, Lokken RP, Steitz JA. PMID: 12554862; PMCID: PMC1370385.
      View in: PubMed   Mentions: 14     Fields:    Translation:HumansCells