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| ID | Type | Description | Link |
|---|---|---|---|
| R21DK105401 | U.S. NIH Grant/Contract | View source |
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Did not meet recruitment targets.
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| Name | Class |
|---|---|
| National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) | NIH |
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Sodium-dependent glucose transporter-2 (SGLT2) inhibitors are a new class of anti-diabetic drugs, which increase urinary glucose excretion thereby promoting weight loss and decreasing plasma glucose levels. We hypothesize that the pharmacodynamic response to SGLT2 inhibitors (specifically canagliflozin) varies among individuals, and that a proportion of this inter-individual variation can be explained by genetic variation. This is a pilot study in healthy, non-diabetic subjects in whom glucose and other related metabolites in the urine and plasma will be measured before and after administration of a single dose of canagliflozin. This will allow us to characterize the inter-individual variation in the pharmacodynamic response to canagliflozin as well as determine if changes in glucose and other related metabolite levels are associated with variants in various candidate genes.
Sodium-dependent glucose transporters (SGLTs) are a family of glucose transporters expressed on the apical surface of epithelial cells in the intestines and kidneys. Their function is to actively transport glucose across epithelia into the blood. Members of the SGLT-family of transporters include sodium-dependent glucose transporters-1, -2, -3, and -4 (SGLT1, SGLT2, SGLT3 and SGLT4), with SGLT2 being the primary glucose transporter in the kidney. SGLT2 inhibitors are a new class of anti-diabetic drug approved as treatments for type 2 diabetes (T2DM). These drugs inhibit SGLT2-mediated reabsorption of glucose in the renal proximal tubule -- thereby increasing urinary glucose excretion and decreasing plasma glucose levels. We hypothesize that the pharmacodynamic response to SGLT2 inhibitors (specifically canagliflozin) varies among individuals, and that a proportion of this inter-individual variation can be explained by genetic variation. To explore this hypothesis, we will conduct a pilot study in healthy, non-diabetic subjects in whom glucose and other related metabolites in the urine and plasma will be measured before and after administration of a single dose of canagliflozin. This will allow us to characterize the inter-individual variation in the pharmacodynamic response to canagliflozin as well as determine if changes in glucose and other related metabolite levels are associated with variants in candidate genes (SGLT3, SGLT4, and glucose transporter-2 (abbreviated as either GLUT9 or SLC2A9)).
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Wild type genotype | Active Comparator | Research subjects with wild type genotypes at three candidate genes encoding sodium-dependent glucose transporter-3, sodium-dependent glucose transporter-4, and glucose transporter-9 (abbreviated as SLC5A4, SLC5A9, SLC2A9, respectively) will be studied before and after canagliflozin treatment. |
|
| Nonsense mutation in SLC5A4 | Experimental | Research subjects who are homozygous for nonsense mutation in SLC5A4 (sodium-dependent glucose transporter-3) will be studied before and after canagliflozin treatment. |
|
| Nonsense mutation in SLC5A9 | Experimental | Research subjects who are homozygous for nonsense mutation in SLC5A9 (sodium-dependent glucose transporter-4) will be studied before and after canagliflozin treatment. |
|
| Missense variant in SLC2A9 | Experimental | Research subjects who are homozygous for nonsynonymous variant in glucose transporter-9 (SLC2A9) will be studied before and after canagliflozin treatment. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Canagliflozin | Drug | A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
|
| Measure | Description | Time Frame |
|---|---|---|
| Urinary Excretion of Glucose (Measured During the 24 Hours Following Administration of Canagliflozin) | The pharmacodynamic response to canagliflozin will be assessed by measuring the increase in 24 hour urinary glucose excretion. | 24 hours after administration of canagliflozin |
| Change in Fractional Excretion of Uric Acid (the Difference Between Data After Administration of Canagliflozin Minus Data Before Administration of Canagliflozin) | For the study arm focused on individuals with a genetic variant in SLC2A9, the pharmacodynamic response to canagliflozin will be assessed by measuring the absolute change in fractional excretion of uric acid in the urine. Fractional excretion of uric acid represents the fraction of the calculated filtered uric acid load (serum uric acid level multiplied by the measured creatinine clearance rate) that was excreted in the urine. | 24 hour urine collection after administration of canagliflozin |
| Measure | Description | Time Frame |
|---|---|---|
| Canagliflozin-induced Change in Urinary Excretion of Sodium | The pharmacodynamic response to canagliflozin will be assessed by measuring the % increase in 24 hour urinary excretion of sodium. | 24 hours after administration of canagliflozin |
| Canagliflozin-induced Change in Serum Creatinine |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Simeon I Taylor, MD, PhD | University of Maryland, Baltimore | Study Chair |
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| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 36993363 | Derived | Taylor SI, Montasser ME, Yuen AH, Fan H, Yazdi ZS, Whitlatch HB, Mitchell BD, Shuldiner AR, Muniyappa R, Streeten EA, Beitelshees AL. Acute pharmacodynamic responses to exenatide: Drug-induced increases in insulin secretion and glucose effectiveness. medRxiv [Preprint]. 2023 May 3:2023.03.15.23287166. doi: 10.1101/2023.03.15.23287166. | |
| 36945579 | Derived | Taylor SI, Cherng HR, Yazdi ZS, Montasser ME, Whitlatch HB, Mitchell BD, Shuldiner AR, Streeten EA, Beitelshees AL. Pharmacogenetics of SGLT2 Inhibitors: Validation of a sex-agnostic pharmacodynamic biomarker. medRxiv [Preprint]. 2023 Jun 12:2023.03.07.23286875. doi: 10.1101/2023.03.07.23286875. |
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Individual participant data will not be shared in order to protect confidentiality of research subjects.
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We over-estimated the percentage of people who would agree to participate in this clinical trial. Ultimately, we terminated the study after 30 participants had completed the clinical trial.
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| ID | Title | Description |
|---|---|---|
| FG000 | Wild Type Genotype | Research subjects with wild type genotypes at three candidate genes encoding sodium-dependent glucose transporter-3, sodium-dependent glucose transporter-4, and glucose transporter-9 (abbreviated as SLC5A4, SLC5A9, SLC2A9, respectively) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| FG001 | Nonsense Mutation in SLC5A4 | Research subjects who are homozygous for nonsense mutation in SLC5A4 (sodium-dependent glucose transporter-3) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| FG002 | Nonsense Mutation in SLC5A9 | Research subjects who are homozygous for nonsense mutation in SLC5A9 (sodium-dependent glucose transporter-4) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| FG003 | Missense Variant in SLC2A9 | Research subjects who are homozygous for nonsynonymous variant in glucose transporter-9 (SLC2A9) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| Title | Milestones | Reasons Not Completed | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
|
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| ID | Title | Description |
|---|---|---|
| BG000 | Wild Type Genotype | Research subjects with wild type genotypes at three candidate genes encoding sodium-dependent glucose transporter-3, sodium-dependent glucose transporter-4, and glucose transporter-9 (abbreviated as SLC5A4, SLC5A9, SLC2A9, respectively) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Continuous | Mean |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Urinary Excretion of Glucose (Measured During the 24 Hours Following Administration of Canagliflozin) | The pharmacodynamic response to canagliflozin will be assessed by measuring the increase in 24 hour urinary glucose excretion. | The entire population of 30 research participants comprised the database for this analysis. | Posted | Mean | Standard Error | glucose (g)/creatinine (g) | 24 hours after administration of canagliflozin |
|
Participants received a single dose of canagliflozin (300 mg). The primary assessment of adverse events was during the 48 hours in which people were actively participating in the clinical trial (encompassing the two 24-hour urine collections).
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Total Population of Participants in the Clinical Trial | All individuals received the same intervention. With such a small trial and so few adverse events, it is not meaningful to report adverse events for each arm separately. Adverse events were not collected or analyzed according to genotype status. |
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| Term | Organ System | Source Vocabulary | Assessment Type | Notes | Statistical Information |
|---|---|---|---|---|---|
| Accident while driving a horse-drawn buggy | Musculoskeletal and connective tissue disorders | Non-systematic Assessment | At a time when the participant was not taking the study drug (canagliflozin), the patient was driving a horse-drawn buggy and she experienced an accident without any significant injury. |
Small sample size: We had hoped to recruit more participants, but the need to collect two 24 hour urine samples turned out to be a major obstacle.
Small pilot study conducted in healthy volunteers rather than the target population for SGLT2 inhibitors.
Genetic studiy conducted in a Founder Population (Old Order Amish living in Lancaster County). Lancaster Amish chosen because of the availability of genotyping data and existence of infrastructure enabling genotype-directed "call-back" studies.
| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Dr. Simeon Taylor (Professor of Medicine) | University of Maryland School of Medicine | 410-706-6439 | staylor2@som.umaryland.edu |
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | May 16, 2022 | May 16, 2022 | Prot_SAP_000.pdf |
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| ID | Term |
|---|---|
| D003920 | Diabetes Mellitus |
| D006073 | Gout |
| D033461 | Hyperuricemia |
| ID | Term |
|---|---|
| D044882 | Glucose Metabolism Disorders |
| D008659 | Metabolic Diseases |
| D009750 | Nutritional and Metabolic Diseases |
| D004700 | Endocrine System Diseases |
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| ID | Term |
|---|---|
| D000068896 | Canagliflozin |
| ID | Term |
|---|---|
| D013876 | Thiophenes |
| D013457 | Sulfur Compounds |
| D009930 | Organic Chemicals |
| D006573 | Heterocyclic Compounds, 1-Ring |
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|
The pharmacodynamic response to canagliflozin will be assessed by measuring changes in serum creatinine |
| 24 hours after administration of canagliflozin |
| Canagliflozin-induced Change in Serum Uric Acid | The pharmacodynamic response to canagliflozin will be assessed by measuring changes in serum uric acid level | 24 hours after administration of canagliflozin |
| Canagliflozin-induced Change in Fasting Plasma Glucose | The magnitude of the change in fasting plasma glucose 24 hours after administration of canagliflozin (300 mg) | 24 hrs |
| BG001 | Nonsense Mutation in SLC5A4 | Research subjects who are homozygous for nonsense mutation in SLC5A4 (sodium-dependent glucose transporter-3) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| BG002 | Nonsense Mutation in SLC5A9 | Research subjects who are homozygous for nonsense mutation in SLC5A9 (sodium-dependent glucose transporter-4) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| BG003 | Missense Variant in SLC2A9 | Research subjects who are homozygous for nonsynonymous variant in glucose transporter-9 (SLC2A9) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| BG004 | Total | Total of all reporting groups |
| Years |
|
| Sex: Female, Male | Count of Participants | Participants |
|
| Ethnicity (NIH/OMB) | Count of Participants | Participants |
|
| Race (NIH/OMB) | Count of Participants | Participants |
|
| Region of Enrollment | Count of Participants | Participants |
|
| BMI | Mean | Standard Deviation | kg/m^2 |
|
| Serum creatinine | Mean | Standard Deviation | mg/dL |
|
| eGFR | Mean | Standard Deviation | mL/min/1.73m^2 |
|
| Serum sodium | Mean | Standard Deviation | mEq/L |
|
| HbA1c | Mean | Standard Deviation | % of total hemoglobin that is glycated |
|
| Hematocrit | Mean | Standard Deviation | % |
|
| Serum uric acid level | Mean | Standard Deviation | mg/dL |
|
| creatinine clearance | Mean | Standard Deviation | mL/min/1.73m^2 |
|
| Fractional excretion of uric acid | Mean | Standard Deviation | % of filtered uric acid that is excreted |
|
| Urinary sodium excretion (24 hr) | Mean | Standard Deviation | mEq/day |
|
| OG001 | Nonsense Mutation in SLC5A4 | Research subjects who are homozygous for nonsense mutation in SLC5A4 (sodium-dependent glucose transporter-3) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| OG002 | Nonsense Mutation in SLC5A9 | Research subjects who are homozygous for nonsense mutation in SLC5A9 (sodium-dependent glucose transporter-4) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| OG003 | Missense Variant in SLC2A9 | Research subjects who are homozygous for nonsynonymous variant in glucose transporter-9 (SLC2A9) will be studied before and after canagliflozin treatment. Canagliflozin: A single dose of canagliflozin (300 mg, p.o.) will be administered prior to assessing pharmacodynamic response. |
| OG004 | Total Population | Aggregate of all research participants in the four genotypes comprising the four arms of the study. |
|
|
|
| Primary | Change in Fractional Excretion of Uric Acid (the Difference Between Data After Administration of Canagliflozin Minus Data Before Administration of Canagliflozin) | For the study arm focused on individuals with a genetic variant in SLC2A9, the pharmacodynamic response to canagliflozin will be assessed by measuring the absolute change in fractional excretion of uric acid in the urine. Fractional excretion of uric acid represents the fraction of the calculated filtered uric acid load (serum uric acid level multiplied by the measured creatinine clearance rate) that was excreted in the urine. | Data from all 30 patients are summarized. The primary statistical analysis is based on comparison of the 13 "wild type" genotype versus the 7 patients who are homozygous for the variant in SLC2A9 (GLUT9). | Posted | Mean | Standard Error | absolute change in fractional excretion | 24 hour urine collection after administration of canagliflozin |
|
|
|
|
| Secondary | Canagliflozin-induced Change in Urinary Excretion of Sodium | The pharmacodynamic response to canagliflozin will be assessed by measuring the % increase in 24 hour urinary excretion of sodium. | Posted | Mean | Standard Error | % increase in urinary Na excretion | 24 hours after administration of canagliflozin |
|
|
|
|
| Secondary | Canagliflozin-induced Change in Serum Creatinine | The pharmacodynamic response to canagliflozin will be assessed by measuring changes in serum creatinine | Posted | Mean | Standard Error | mg/dL | 24 hours after administration of canagliflozin |
|
|
|
|
| Secondary | Canagliflozin-induced Change in Serum Uric Acid | The pharmacodynamic response to canagliflozin will be assessed by measuring changes in serum uric acid level | Data from all 30 research participants will be summarized. Statistical analysis will focus on comparisons between the 13 participants who are homozygous for the major alleles at all three loci versus the three groups who are homozygous for each of the three other genetic variants. | Posted | Mean | Standard Error | % change in serum uric acid level | 24 hours after administration of canagliflozin |
|
|
|
|
| Secondary | Canagliflozin-induced Change in Fasting Plasma Glucose | The magnitude of the change in fasting plasma glucose 24 hours after administration of canagliflozin (300 mg) | Posted | Mean | Standard Error | mg/dL | 24 hrs |
|
|
|
|
| 0 |
| 30 |
| 0 |
| 30 |
| 2 |
| 30 |
|
| Loose stools | Gastrointestinal disorders | Non-systematic Assessment | One participant experienced loose stools within a few days of taking the single dose of canagliflozin (300 mg). It is unceratain whether this was related to the drug. |
|
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| D001168 | Arthritis |
| D007592 | Joint Diseases |
| D009140 | Musculoskeletal Diseases |
| D000070657 | Crystal Arthropathies |
| D012216 | Rheumatic Diseases |
| D011686 | Purine-Pyrimidine Metabolism, Inborn Errors |
| D008661 | Metabolism, Inborn Errors |
| D030342 | Genetic Diseases, Inborn |
| D009358 | Congenital, Hereditary, and Neonatal Diseases and Abnormalities |
| D010335 | Pathologic Processes |
| D013568 | Pathological Conditions, Signs and Symptoms |
| D006571 |
| Heterocyclic Compounds |
| D005960 | Glucosides |
| D006027 | Glycosides |
| D002241 | Carbohydrates |
Null hypothesis: pharmacodynamic response is the same in the control group and homozygotes for the genetic variant. |
| t-test, 2 sided |
| 0.53 |
Not corrected for multiple comparisons. |
| Other |
Probability that the observed difference was the result of random variation rather than a difference between the two populations. |
| Null hypothesis: pharmacodynamic response is the same in the control group and homozygotes for the genetic variant. | t-test, 2 sided | 0.92 | Not corrected for multiple comparisons. | Other | Probability that the observed difference was the result of random variation rather than a difference between the two populations. |
Null hypothesis: pharmacodynamic response is the same in the control group and homozygotes for the genetic variant. |
| t-test, 2 sided |
| 0.77 |
Not corrected for multiple comparisons. |
| Other |
Probability that the observed difference was the result of random variation rather than a difference between the two populations. |
| Null hypothesis: pharmacodynamic response is the same in the control group and homozygotes for the genetic variant. | t-test, 2 sided | 0.65 | Not corrected for multiple comparisons. | Other | Probability that the observed difference was the result of random variation rather than a difference between the two populations. |
| Null hypothesis: pharmacodynamic response is the same in the control group and homozygotes for the genetic variant. | t-test, 2 sided | 0.01 | Other | Probability that the observed difference was the result of random variation rather than a difference between the two populations. |
| Null hypothesis: pharmacodynamic response is the same in the control group and homozygotes for the genetic variant. | t-test, 2 sided | 0.16 | Not corrected for multiple comparisons. | Other | Probability that the observed difference was the result of random variation rather than a difference between the two populations. |
Null hypothesis: pharmacodynamic response is the same in the control group and homozygotes for the genetic variant. |
| t-test, 2 sided |
| 0.92 |
Not corrected for multiple comparisons. |
| Other |
Probability that the observed difference was the result of random variation rather than a difference between the two populations. |
| Not corrected for multiple comparisons. | t-test, 2 sided | 0.39 | Not corrected for multiple comparisons. | Other | Probability that the observed difference was the result of random variation rather than a difference between the two populations. |