Past and Present Diabetes Studies

How SWDI leverages expertise and technology to develop creative, cost-effective solutions in diabetes care

Staff of N. Paul Whittier Clinical Diabetes Research Center give a thumbs up - La Jolla, California

N. Paul Whittier Clinical Diabetes Research Center staff in La Jolla, California.

How SWDI leverages expertise and technology to develop creative, cost-effective solutions in diabetes care

The primary aim of research at Scripps Whittier Diabetes Institute is to develop new programs, explore new medications and create unique solutions to enhance the quality of life for individuals with diabetes through both investigator-initiated and commercially-sponsored clinical research studies.


The research teams at Scripps Whittier Diabetes Institute have focused on conducting community-based participatory research for over 25 years and lead the Community and Collaboration Core for the Clinical Translational Science Award at Scripps Research Translational Institute


Our clinical research team, based on the campus of Scripps Memorial Hospital La Jolla, partners with expert physicians within the Scripps Clinic Medical Group to offer access to the latest studies with medications and technologies to improve care for people with diabetes.  


Investigator-initiated projects

Researcher investigators, physicians, patients, and other stakeholders work closely together at Scripps Whittier Diabetes Institute to invent creative, integrative, and practical solutions to unaddressed issues in diabetes care and management through funding from investigator-initiated research projects. Whittier is at the leading edge of the development of more effective, cost-effective, and pragmatic approaches to improving clinical outcomes in diabetes.


The overarching goal of investigator-initiated research is to improve the quality of and patients’ access to diabetes care by developing new programs and enhancing or adapting existing treatments. 


Cross-cutting project themes are: 


  • Leveraging technology 
  • Using team-based care models 
  • Developing new, creative solutions to long-standing barriers in clinical care that contribute to health disparities in diabetes


Our interdisciplinary research team — including investigators, endocrinologists, psychologists, nurses, diabetes educators and other research staff — has a strong track record of success in obtaining funding for these projects from NIH, donations, pharmaceutical companies and other industry partners. Over the past five years, Scripps Whittier Diabetes Institute has received over $1.5 million annually from NIH alone to fund investigator-initiated research studies. 

Diabetes research scientists at Scripps Whittier Diabetes Institute.

Diabetes research scientists at Scripps Whittier Diabetes Institute. Investigators from left to right: Athena Philis-Tsimikas, MD; Emily Soriano, PhD; Samantha Speirling Bagsic, PhD; Emily San Diego, PhD; and Addie Fortmann, PhD.

Current investigator-initiated projects

Past investigator-initiated projects

Commercially-sponsored clinical trials

Dr. Amy Chang. Endorincologist, Scripps Clinic, and a patient reviewing results.

Commercially-sponsored clinical trials

The Scripps Whittier Diabetes Institute partners with national and international pharmaceutical and device companies to conduct studies that offer opportunities for individuals with type 1 and type 2 diabetes, obesity, and non-alcoholic steatohepatitis that seek new devices and medications to improve their glucose management and to reduce the risk for associated diseases, such as retinopathy, cardiovascular disease and advanced non-alcoholic fatty liver infiltration. 


Examples of trials recently conducted in our center include: 


  • New once-weekly basal insulins alone and in combination with GLP1-receptor agonists (GLP1-RA), which provide better blood sugar control with less weight gain — remarkably, this means injection requirements can drop from 365 times a year to only 52 
  • Longer-term trials evaluating GLP1-RA (such as Ozempic, Rybelsus and Mounjaro) to treat diabetes and obesity and to prevent heart disease
  • Evaluating the efficacy and safety of advanced hybrid closed loop insulin pump systems for type 1 diabetes
  • An investigator-initiated study, in partnership with gastroenterologists at Scripps Clinic, using a fibroscan device to assess patients with type 2 diabetes for non-alcoholic fatty liver infiltration and fibrosis


To learn more about research studies at the N. Paul Whittier Clinical Diabetes Research Center and Scripps, view the active studies.


Our investigators have served as primary authors, presenters and partners in the conduct of many of these studies. Dr. Philis-Tsimikas’s publications.


  1. Philis-Tsimikas A, Asong M, Franek E, Jia T, Rosenstock J, Stachlewska K, Watada H, Kellerer M. Switching to once-weekly insulin icodec versus once-daily insulin degludec in individuals with basal insulin-treated type 2 diabetes (ONWARDS 2): a phase 3a, randomised, open label, multicentre, treat-to-target trial. Lancet Diabetes Endocrinol. 2023 Jun;11(6):414-425. doi: 10.1016/S2213-8587(23)00093-1. Epub 2023 May 3.
  2. Philis-Tsimikas A, Bajaj HS, Begtrup K, Cailleteau R, Gowda A, Lingvay I, Mathieu C,Russell-Jones D, Rosenstock J, Rationale and design of the phase 3 development programme (ONWARDS 1–6 trials) investigating once-weekly insulin icodec in diabetes. Diabetes Obes Metab. 2022 Sept;doi.org/10.1111/dom.14871.13954. Epub 2022 Sept
  3. Miller KM, Kanapka LG, Rickels MR, et al. (Philis-Tsimikas A) Benefit of Continuous Glucose Monitoring in Reducing Hypoglycemia Is Sustained Through 12 Months of Use Among Older Adults with Type 1 Diabetes. Diabetes Technol Ther. 2022 Jun;24(6):424-434. doi: 10.1089/dia.2021.0503. Epub 2022 Apr 11. PMID: 35294272; PMCID: PMC9208859.
  4. Carlson AL, Sherr JL, Shulman DI, et al. (Philis-Tsimikas A) Safety and Glycemic Outcomes During the MiniMed™ Advanced Hybrid Closed-Loop System Pivotal Trial in Adolescents and Adults with Type 1 Diabetes. Diabetes Technol Ther. 2022 Mar;24(3):178-189. doi: 10.1089/dia.2021.0319. Epub 2021 Nov 16. PMID: 34694909; PMCID: PMC8971997.
  5. Buse JB, Davies MJ, Frier BM, Philis-Tsimikas A. 100 years on: the impact of the discovery of insulin on clinical outcomes. BMJ Open Diabetes Research and Care 2021;9:e002373. doi: 10.1136/bmjdrc-2021-002373
  6. Martens T, Beck RW, Bailey R, et al. Ruedy KJ, Calhoun P, Peters AL, Pop-Busui R, Philis-Tsimikas A, Bao S, Umpierrez G, Davis G, Kruger D, Bhargava A, Young L, McGill JB, Aleppo G, Nguyen QT, Orozco I, Biggs W, Lucas KJ, Polonsky WH, Buse JB, Price D, Bergenstal RM, for the MOBILE Study Group, Effect of Continuous Glucose Monitoring on Glycemic Control in Patients With Type 2 Diabetes Treated With Basal Insulin: A Randomized Clinical Trial. JAMA. 2021;325(22):2262–2272.
  7. Philis-Tsimikas A, Lane W, Pedersen-Bjergaard U, Wysham C, Bardtrum L, Harring S, Heller S. The relationship between HbA1c and hypoglycaemia in patients with diabetes treated with insulin degludec versus insulin glargine 100 units/mL. Diabetes Obes Metab. 2020 May;22(5):779-787. doi: 10.1111/dom.13954. Epub 2020 Jan 24. PMID: 31903697; PMCID: PMC7186831.
  8. Pratley RE, Kanapka LG, Rickels MR, Ahmann A, Aleppo G, Beck R, Bhargava A, Bode BW, Carlson A, Chaytor NS, Fox DS, Goland R, Hirsch IB, Kruger D, Kudva YC, Levy C, McGill JB, Peters A, Philipson L, Philis-Tsimikas A, Pop-Busui R, Shah VN, Thompson M, Vendrame F, Verdejo A, Weinstock RS, Young L, Miller KM; Wireless Innovation for Seniors With Diabetes Mellitus (WISDM) Study Group. Effect of Continuous Glucose Monitoring on Hypoglycemia in Older Adults With Type 1 Diabetes: A Randomized Clinical Trial. JAMA. 2020 Jun 16;323(23):2397-2406. doi: 10.1001/jama.2020.6928. PMID: 32543682; PMCID: PMC7298607.
  9. Philis-Tsimikas A, Klonoff DC, Khunti K, Bajaj HS, Leiter LA, Hansen MV, Troelsen LN, Ladelund S, Heller S, Pieber TR; CONCLUDE Study Group. Risk of hypoglycaemia with insulin degludec versus insulin glargine U300 in insulin-treated patients with type 2 diabetes: the randomised, head-to-head CONCLUDE trial. Diabetologia. 2020 Apr;63(4):698-710. doi: 10.1007/s00125-019-05080-9. Epub 2020 Jan 27. PMID: 31984443; PMCID: PMC7054369.
  10. Philis-Tsimikas A, Billings LK, Busch R, Portillo CM, Sahay R, Halladin N, Eggert S, Begtrup K, Harris S. Superior efficacy of insulin degludec/liraglutide versus insulin glargine U100 as add-on to sodium-glucose co-transporter-2 inhibitor therapy: A randomized clinical trial in people with uncontrolled type 2 diabetes. Diabetes Obes Metab. 2019 Jun;21(6):1399-1408. doi: 10.1111/dom.13666. Epub 2019 Apr 4. PMID: 30761720
  11. Rose L, Kadowaki T, Pieber TR, Buchholtz K, Ekelund M, Gorst-Rasmussen A, Philis-Tsimikas A. Efficacy and Safety of Fast-Acting Insulin Aspart in People with Type 1 Diabetes Using Carbohydrate Counting: A Post Hoc Analysis of Two Randomised Controlled Trials. Diabetes Ther. 2019 Jun;10(3):1029-1041. doi: 10.1007/s13300-019-0608-4. Epub 2019 Apr 4. PMID: 30949906
  12. Philis-Tsimikas A, Wysham CH, Hardy E, Han J, Iqbal N. Efficacy and tolerability of exenatide once weekly over 7 years in patients with type 2 diabetes: An open-label extension of the DURATION-1 study. J Diabetes Complications. 2019 Mar;33(3):223-230. doi: 10.1016/j.jdiacomp.2018.11.012. Epub 2018 Dec 5. PMID: 30600137
  13. Zinman B, Bhosekar V, Busch R, Holst I, Ludvik B, Thielke D, Thrasher J, Woo V, Philis-Tsimikas A. Semaglutide once weekly as add-on to SGLT-2 inhibitor therapy in type 2 diabetes (SUSTAIN 9): a randomised, placebo-controlled trial. Lancet Diabetes Endocrinol. 2019 Mar 1. pii: S2213-8587(19)30066-X.. [Epub ahead of print] PMID: 30833170
  14. Philis-Tsimikas A, Billings LK, Busch R, Morales Portillo C, Sahay R, Halladin N, Eggert S, Begtrup K, Harris S. Superior Efficacy of Insulin Degludec/Liraglutide versus Insulin Glargine U100 as Add-on to Sodium-Glucose Co-Transporter-2 Inhibitor Therapy: a Randomized Clinical Trial in Patients with Uncontrolled Type 2 Diabetes. Diabetes Obes Metab. 2019 Feb 13. [Epub ahead of print] PMID: 30761720
  15. Chaykin L, Bhargava A, de la Rosa R, Wysham CH, Nørgård Troelsen L, Østoft SH, Philis-Tsimikas A, Effect of Insulin Degludec Versus Insulin Glargine U100 on Hypoglycemia in Hispanic Patients With Type 2 Diabetes: Results From the SWITCH 2 Trial. Clinical Diabetes 2019 Jan; 37(1): 73-81. PMID: 30705500
  16. Mathieu C, Bode BW, Franek E, Philis‐Tsimikas A, Rose L, Graungaard T, Birk Østerskov A, Russell‐Jones D. Efficacy and safety of fast‐acting insulin aspart in comparison with insulin aspart in type 1 diabetes (onset 1): A 52‐week, randomized, treat‐to‐target, phase III trial. Diabetes Obes Metab. 2018 May; 20(5): 1148–1155. Published online 2018 Feb 4. doi: 10.1111/dom.13205 PMCID: PMC5947306
  17. Lane W, Bailey TS, Gerety G, Gumprecht J; Philis-Tsimikas A; Hansen CT, Nielsen TSS, Mark Warren, Group Information; The SWITCH 1. Effect of insulin degludec vs insulin glargine U100 on hypoglycemia in patients with type 1 diabetes: the SWITCH 1 randomized clinical trial. JAMA. 2017 Jul 4;318(1):33-44, PMID: 28672316
  18. Aleppo G, Ruedy KJ, Riddlesworth TD, Kruger DF, Peter AL, Hirsch I, Bergenstal RM, Toschi E, Ahmann AJ, Shah VN, Rickels MR, Bode BW, Philis-Tsimikas A, Pop-Busui R, Rodriguez H, Eyth E, Bhargava A, Kollman C, Beck RW. REPLACE-BG: A randomized trial comparing continuous glucose monitoring with and without routine blood glucose monitoring in well-controlled adults with type 1 diabetes. Diabetes Care 2017 Apr; 40(4): 538-545
  19. Drab SR, Philis-Tsimikas A. A new option for glycemic control: insulin degludec, a new-generation basal insulin with an ultralong duration of action. Pharmacotherapy, 2014 Mar;34(3):291-302. doi: 10.1002/phar.1361. Review. PMID: 24132869
  20. Philis-Tsimikas A, Chang A, Miller L., Precision, accuracy, and user acceptance of the OneTouch SelectSimple blood glucose monitoring system. J Diabetes Sci Technol. 2011 Nov 1;5(6):1602-9. PMID: 22226284

Commercially-sponsored clinical trials

The Scripps Whittier Diabetes Institute partners with national and international pharmaceutical and device companies to conduct studies that offer opportunities for individuals with type 1 and type 2 diabetes, obesity, and non-alcoholic steatohepatitis that seek new devices and medications to improve their glucose management and to reduce the risk for associated diseases, such as retinopathy, cardiovascular disease and advanced non-alcoholic fatty liver infiltration. 


Examples of trials recently conducted in our center include: 


  • New once-weekly basal insulins alone and in combination with GLP1-receptor agonists (GLP1-RA), which provide better blood sugar control with less weight gain — remarkably, this means injection requirements can drop from 365 times a year to only 52 
  • Longer-term trials evaluating GLP1-RA (such as Ozempic, Rybelsus and Mounjaro) to treat diabetes and obesity and to prevent heart disease
  • Evaluating the efficacy and safety of advanced hybrid closed loop insulin pump systems for type 1 diabetes
  • An investigator-initiated study, in partnership with gastroenterologists at Scripps Clinic, using a fibroscan device to assess patients with type 2 diabetes for non-alcoholic fatty liver infiltration and fibrosis


Our investigators have served as primary authors, presenters and partners in the conduct of many of these studies.


  1. Philis-Tsimikas A, Asong M, Franek E, Jia T, Rosenstock J, Stachlewska K, Watada H, Kellerer M. Switching to once-weekly insulin icodec versus once-daily insulin degludec in individuals with basal insulin-treated type 2 diabetes (ONWARDS 2): a phase 3a, randomised, open label, multicentre, treat-to-target trial. Lancet Diabetes Endocrinol. 2023 Jun;11(6):414-425. doi: 10.1016/S2213-8587(23)00093-1. Epub 2023 May 3.
  2. Philis-Tsimikas A, Bajaj HS, Begtrup K, Cailleteau R, Gowda A, Lingvay I, Mathieu C,Russell-Jones D, Rosenstock J, Rationale and design of the phase 3 development programme (ONWARDS 1–6 trials) investigating once-weekly insulin icodec in diabetes. Diabetes Obes Metab. 2022 Sept;doi.org/10.1111/dom.14871.13954. Epub 2022 Sept
  3. Miller KM, Kanapka LG, Rickels MR, et al. (Philis-Tsimikas A) Benefit of Continuous Glucose Monitoring in Reducing Hypoglycemia Is Sustained Through 12 Months of Use Among Older Adults with Type 1 Diabetes. Diabetes Technol Ther. 2022 Jun;24(6):424-434. doi: 10.1089/dia.2021.0503. Epub 2022 Apr 11. PMID: 35294272; PMCID: PMC9208859.
  4. Carlson AL, Sherr JL, Shulman DI, et al. (Philis-Tsimikas A) Safety and Glycemic Outcomes During the MiniMed™ Advanced Hybrid Closed-Loop System Pivotal Trial in Adolescents and Adults with Type 1 Diabetes. Diabetes Technol Ther. 2022 Mar;24(3):178-189. doi: 10.1089/dia.2021.0319. Epub 2021 Nov 16. PMID: 34694909; PMCID: PMC8971997.
  5. Buse JB, Davies MJ, Frier BM, Philis-Tsimikas A. 100 years on: the impact of the discovery of insulin on clinical outcomes. BMJ Open Diabetes Research and Care 2021;9:e002373. doi: 10.1136/bmjdrc-2021-002373
  6. Martens T, Beck RW, Bailey R, et al. Ruedy KJ, Calhoun P, Peters AL, Pop-Busui R, Philis-Tsimikas A, Bao S, Umpierrez G, Davis G, Kruger D, Bhargava A, Young L, McGill JB, Aleppo G, Nguyen QT, Orozco I, Biggs W, Lucas KJ, Polonsky WH, Buse JB, Price D, Bergenstal RM, for the MOBILE Study Group, Effect of Continuous Glucose Monitoring on Glycemic Control in Patients With Type 2 Diabetes Treated With Basal Insulin: A Randomized Clinical Trial. JAMA. 2021;325(22):2262–2272.
  7. Philis-Tsimikas A, Lane W, Pedersen-Bjergaard U, Wysham C, Bardtrum L, Harring S, Heller S. The relationship between HbA1c and hypoglycaemia in patients with diabetes treated with insulin degludec versus insulin glargine 100 units/mL. Diabetes Obes Metab. 2020 May;22(5):779-787. doi: 10.1111/dom.13954. Epub 2020 Jan 24. PMID: 31903697; PMCID: PMC7186831.
  8. Pratley RE, Kanapka LG, Rickels MR, Ahmann A, Aleppo G, Beck R, Bhargava A, Bode BW, Carlson A, Chaytor NS, Fox DS, Goland R, Hirsch IB, Kruger D, Kudva YC, Levy C, McGill JB, Peters A, Philipson L, Philis-Tsimikas A, Pop-Busui R, Shah VN, Thompson M, Vendrame F, Verdejo A, Weinstock RS, Young L, Miller KM; Wireless Innovation for Seniors With Diabetes Mellitus (WISDM) Study Group. Effect of Continuous Glucose Monitoring on Hypoglycemia in Older Adults With Type 1 Diabetes: A Randomized Clinical Trial. JAMA. 2020 Jun 16;323(23):2397-2406. doi: 10.1001/jama.2020.6928. PMID: 32543682; PMCID: PMC7298607.
  9. Philis-Tsimikas A, Klonoff DC, Khunti K, Bajaj HS, Leiter LA, Hansen MV, Troelsen LN, Ladelund S, Heller S, Pieber TR; CONCLUDE Study Group. Risk of hypoglycaemia with insulin degludec versus insulin glargine U300 in insulin-treated patients with type 2 diabetes: the randomised, head-to-head CONCLUDE trial. Diabetologia. 2020 Apr;63(4):698-710. doi: 10.1007/s00125-019-05080-9. Epub 2020 Jan 27. PMID: 31984443; PMCID: PMC7054369.
  10. Philis-Tsimikas A, Billings LK, Busch R, Portillo CM, Sahay R, Halladin N, Eggert S, Begtrup K, Harris S. Superior efficacy of insulin degludec/liraglutide versus insulin glargine U100 as add-on to sodium-glucose co-transporter-2 inhibitor therapy: A randomized clinical trial in people with uncontrolled type 2 diabetes. Diabetes Obes Metab. 2019 Jun;21(6):1399-1408. doi: 10.1111/dom.13666. Epub 2019 Apr 4. PMID: 30761720
  11. Rose L, Kadowaki T, Pieber TR, Buchholtz K, Ekelund M, Gorst-Rasmussen A, Philis-Tsimikas A. Efficacy and Safety of Fast-Acting Insulin Aspart in People with Type 1 Diabetes Using Carbohydrate Counting: A Post Hoc Analysis of Two Randomised Controlled Trials. Diabetes Ther. 2019 Jun;10(3):1029-1041. doi: 10.1007/s13300-019-0608-4. Epub 2019 Apr 4. PMID: 30949906
  12. Philis-Tsimikas A, Wysham CH, Hardy E, Han J, Iqbal N. Efficacy and tolerability of exenatide once weekly over 7 years in patients with type 2 diabetes: An open-label extension of the DURATION-1 study. J Diabetes Complications. 2019 Mar;33(3):223-230. doi: 10.1016/j.jdiacomp.2018.11.012. Epub 2018 Dec 5. PMID: 30600137
  13. Zinman B, Bhosekar V, Busch R, Holst I, Ludvik B, Thielke D, Thrasher J, Woo V, Philis-Tsimikas A. Semaglutide once weekly as add-on to SGLT-2 inhibitor therapy in type 2 diabetes (SUSTAIN 9): a randomised, placebo-controlled trial. Lancet Diabetes Endocrinol. 2019 Mar 1. pii: S2213-8587(19)30066-X.. [Epub ahead of print] PMID: 30833170
  14. Philis-Tsimikas A, Billings LK, Busch R, Morales Portillo C, Sahay R, Halladin N, Eggert S, Begtrup K, Harris S. Superior Efficacy of Insulin Degludec/Liraglutide versus Insulin Glargine U100 as Add-on to Sodium-Glucose Co-Transporter-2 Inhibitor Therapy: a Randomized Clinical Trial in Patients with Uncontrolled Type 2 Diabetes. Diabetes Obes Metab. 2019 Feb 13. [Epub ahead of print] PMID: 30761720
  15. Chaykin L, Bhargava A, de la Rosa R, Wysham CH, Nørgård Troelsen L, Østoft SH, Philis-Tsimikas A, Effect of Insulin Degludec Versus Insulin Glargine U100 on Hypoglycemia in Hispanic Patients With Type 2 Diabetes: Results From the SWITCH 2 Trial. Clinical Diabetes 2019 Jan; 37(1): 73-81. PMID: 30705500
  16. Mathieu C, Bode BW, Franek E, Philis‐Tsimikas A, Rose L, Graungaard T, Birk Østerskov A, Russell‐Jones D. Efficacy and safety of fast‐acting insulin aspart in comparison with insulin aspart in type 1 diabetes (onset 1): A 52‐week, randomized, treat‐to‐target, phase III trial. Diabetes Obes Metab. 2018 May; 20(5): 1148–1155. Published online 2018 Feb 4. doi: 10.1111/dom.13205 PMCID: PMC5947306
  17. Lane W, Bailey TS, Gerety G, Gumprecht J; Philis-Tsimikas A; Hansen CT, Nielsen TSS, Mark Warren, Group Information; The SWITCH 1. Effect of insulin degludec vs insulin glargine U100 on hypoglycemia in patients with type 1 diabetes: the SWITCH 1 randomized clinical trial. JAMA. 2017 Jul 4;318(1):33-44, PMID: 28672316
  18. Aleppo G, Ruedy KJ, Riddlesworth TD, Kruger DF, Peter AL, Hirsch I, Bergenstal RM, Toschi E, Ahmann AJ, Shah VN, Rickels MR, Bode BW, Philis-Tsimikas A, Pop-Busui R, Rodriguez H, Eyth E, Bhargava A, Kollman C, Beck RW. REPLACE-BG: A randomized trial comparing continuous glucose monitoring with and without routine blood glucose monitoring in well-controlled adults with type 1 diabetes. Diabetes Care 2017 Apr; 40(4): 538-545
  19. Drab SR, Philis-Tsimikas A. A new option for glycemic control: insulin degludec, a new-generation basal insulin with an ultralong duration of action. Pharmacotherapy, 2014 Mar;34(3):291-302. doi: 10.1002/phar.1361. Review. PMID: 24132869
  20. Philis-Tsimikas A, Chang A, Miller L., Precision, accuracy, and user acceptance of the OneTouch SelectSimple blood glucose monitoring system. J Diabetes Sci Technol. 2011 Nov 1;5(6):1602-9. PMID: 22226284