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CompletedNCT03300570Updated Jun 14, 2021Results posted

Dolcanatide in Preventing Colorectal Cancer in Healthy Volunteers

A Phase 1 interventional study of Dolcanatide and Laboratory Biomarker Analysis in Colorectal Carcinoma, sponsored by National Cancer Institute (NCI). Completed at 1 site in United States. Open to participants aged 18 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2021-06-14.

Sponsored by National Cancer Institute (NCI) · Phase 1, Interventional, and Prevention

Phase
Phase 1
Study type
Interventional
Enrollment
27
Allocation
Randomized
Ages
18 Years to 65 Years
Sex
All
01

Study summary

This phase I trial studies how well dolcanatide works in preventing colorectal cancer in healthy participants. Dolcanatide is similar to a natural hormone released into the intestine. It is thought that people who have low levels of the hormone are more likely to get colon cancer. It may be possible to prevent colon cancer by giving a drug that is similar to the hormone, such as dolcanatide.

Read the detailed description

PRIMARY OBJECTIVES:

I. To identify the ability of dolcanatide (SP333), when administered as a single daily dose of 27 mg x 7 days, to induce a direct pharmacological effect on cGMP levels, based on biopsy samples from the rectum obtained pre- and post-intervention, as compared to placebo.

SECONDARY OBJECTIVES:

I. To assess the pharmacodynamic (PD) response rate between arms (dolcanatide versus placebo).

II. To confirm the safety and tolerability of dolcanatide, as compared to placebo.

OUTLINE: Participants are randomized to 1 of 2 arms.

ARM A: Participants receive dolcanatide orally (PO) once daily (QD) for 7 days.

ARM B: Participants receive placebo PO QD for 7 days.

After completion of study, participants are followed up at 21 and 51 days.

02

Conditions studied

  • Colorectal Carcinoma
03

In context

Colorectal Neoplasms

5,734 studies on the registry are indexed under Colorectal Neoplasms; 1,481 are open to participants now.

This study's enrollment of 27 is below the median of 77 across 4,222 interventional studies indexed under Colorectal Neoplasms.

Browse Colorectal Neoplasms studies →

Lead sponsor

National Cancer Institute (NCI) is the lead sponsor of 3,554 studies on the registry; 334 are open to participants now.

Of its 407 completed or terminated interventional studies of FDA-regulated products, 370 (91%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 65 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • PRE-REGISTRATION INCLUSION
  • Able to understand and willingness to sign a written informed consent document and follow study procedures
  • Willing to abstain from grapefruit juice during study
  • Willing to employ adequate contraception for men and women of childbearing potential; Note: acceptable methods include double barrier methods, intrauterine device (IUD), postmenopausal status documented by serum follicle stimulating hormone (FSH), and/or documentation of surgical sterilization
  • Willing to provide blood and tissue specimens for research purposes
  • REGISTRATION INCLUSION
  • Normal organ function and have normal laboratory findings without clinically significant findings
  • Leukocytes >= 3 x 10\^3/microliter (B/L)
  • Absolute neutrophil count >= 1.5 x 10\^3/microliter (B/L)
  • Platelets >= 100 x 10\^3/microliter (B/L)
  • Total bilirubin within normal institutional limits
  • Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT])/ alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =\< 1.5 x institutional upper limit of normal (ULN)
  • Creatinine =\< institutional upper limit of normal
  • Body mass index \< 35 kg/m\^2
  • No findings in the rectum of advanced adenoma, chronic inflammation, or cancer

Exclusion criteria

Exclusion Criteria:

  • PRE-REGISTRATION EXCLUSION
  • Documented history of advanced adenomas (>= 1 cm in maximal diameter, >= 3 in total number, villous morphology, or high-grade dysplasia) or colorectal cancer
  • Family history of polyposis syndrome (e.g., familial adenomatous polyposis [FAP], hereditary nonpolyposis colorectal cancer [HNPCC]) or colorectal cancer (first degree relatives younger than 60 years old)
  • History of gastroparesis
  • History of surgery involving the luminal gastrointestinal (GI) tract, including bariatric surgery; exception: prior appendectomy >= 60 days prior to pre-registration is not an exclusion criterion
  • History of celiac disease
  • Inflammatory bowel disease (Crohn's disease, ulcerative colitis)
  • Previous diagnosis of irritable bowel syndrome, chronic constipation, functional bowel disorders, colonic motility disorder, or opioid-induced constipation
  • Any malignancy within 3 years of baseline; exception: participants with a history of basal cell or squamous cell skin cancer may be enrolled at the discretion of the investigator
  • Currently receiving any other investigational agents
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to dolcanatide or to any of the excipients
  • History of difficulty with sigmoidoscopy or abnormal colorectal anatomy
  • Uncontrolled current illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements
  • Pregnant or lactating women
  • Current use of laxatives more than 3 times per week
  • Current use of >= 5 cigarettes/day
  • Current use of >= 3 alcoholic drinks/day
  • Use of anti-coagulants or anti-platelet agents within 5 days prior to anticipated sigmoidoscopy; exception: individuals taking aspirin will not be excluded and will not be subject to a wash-out period
  • History of bleeding/coagulation problems
  • Any medical condition reported by the participant or documented in the medical record that is judged by the investigator to constitute a risk to safe participation
  • Known or suspected mechanical gastrointestinal obstruction
  • REGISTRATION EXCLUSION
  • Sigmoidoscopy finding requiring clinical intervention
  • Use of any illicit or illegal substances detected by urinary drug screen
05

Study design

Phase
Phase 1
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Investigator)
Enrollment
27 participants (actual)

Study arms

  • Experimental
    Arm A (dolcanatide)

    Participants receive dolcanatide PO QD for 7 days.

    Drug: Dolcanatide · Other: Laboratory Biomarker Analysis · Other: Questionnaire Administration

  • Placebo comparator
    Arm B (placebo)

    Participants receive placebo PO QD for 7 days.

    Other: Laboratory Biomarker Analysis · Other: Placebo Administration · Other: Questionnaire Administration

Interventions

  • Given PO

    Also known as: SP 333, SP-333, SP333

  • OtherLaboratory Biomarker Analysis

    Correlative studies

  • OtherPlacebo Administration

    Given PO

  • OtherQuestionnaire Administration

    Ancillary studies

06

What researchers measure

Primary outcomes

  1. Pharmacological Effect on Cyclic Guanosine Monophosphate (cGMP) Levels for Dolcanatide Arm Versus (vs.) Placebo, as Measured by the Differences in Mean cGMP Levels After 7 Days of Intervention

    Pharmacological effect on cyclic guanosine monophosphate (cGMP) levels for dolcanatide arm versus (vs.) placebo, where this effect is defined as the arithmetic difference in mean cGMP levels before and after 7 days of dolcanatide from subject biopsies. This represents the increase in cGMP stimulated by 7 days of dolcanatide in an individual subject. The mean cGMP value will be calculated based on 6 biopsies collected from the rectum during a flexible sigmoidoscopy procedure. Each biopsy was analyzed in triplicate using a commercially available EIA kit.

    Time frame: Baseline to 7 days

Secondary outcomes

  1. Pharmacodynamic (PD) Response Rate

    Each participant will be assessed for PD response. The calculation is based on the standardized difference in means for the pharmacological effect on cGMP levels at the participant level, where a subject with a z \>= 1.645 will be considered a PD responder. A participant with a z \< 1.645 will be considered a non-responder. The PD response rate (percentage) of patients are summarized below by arm.

    Time frame: Baseline to 7 days

  2. Percentage of Participants With Grade 3 or Higher Diarrhea Per National Cancer Institute Common Terminology Criteria for Adverse Events Version 4.0

    The overall adverse event rates (percentages) for grade 3 or higher adverse events regardless of attribution to treatment are reported below. The percentages below are summarized for Diarrhea.

    Time frame: Up to 21 days

07

Results

Posted Dec 17, 2019

Participant flow

Participant flow — Overall Study
MilestoneArm A (Placebo)Arm B (Dolcanatide)
Started1314
Completed1113
Not completed21
Withdrew: Adverse event01
Withdrew: Withdrawal by subject10
Withdrew: Inadequate bowel prep10

Outcome measures

PrimaryPharmacological Effect on Cyclic Guanosine Monophosphate (cGMP) Levels for Dolcanatide Arm Versus (vs.) Placebo, as Measured by the Differences in Mean cGMP Levels After 7 Days of Intervention

Pharmacological effect on cyclic guanosine monophosphate (cGMP) levels for dolcanatide arm versus (vs.) placebo, where this effect is defined as the arithmetic difference in mean cGMP levels before and after 7 days of dolcanatide from subject biopsies. This represents the increase in cGMP stimulated by 7 days of dolcanatide in an individual subject. The mean cGMP value will be calculated based on 6 biopsies collected from the rectum during a flexible sigmoidoscopy procedure. Each biopsy was analyzed in triplicate using a commercially available EIA kit.

Time frame:
Baseline to 7 days
Reported as:
Mean · pmol/mg
Pharmacological Effect on Cyclic Guanosine Monophosphate (cGMP) Levels for Dolcanatide Arm Versus (vs.) Placebo, as Measured by the Differences in Mean cGMP Levels After 7 Days of Intervention
pmol/mgArm B (Dolcanatide)Arm A (Placebo)
Pharmacological Effect on Cyclic Guanosine Monophosphate (cGMP) Levels for Dolcanatide Arm Versus (vs.) Placebo, as Measured by the Differences in Mean cGMP Levels After 7 Days of Intervention-0.42 ± 0.43-0.22 ± 0.29
Statistical analysis
  • Arm B (Dolcanatide) vs Arm A (Placebo) · Wilcoxon (Mann-Whitney) · p = 0.15
SecondaryPharmacodynamic (PD) Response Rate

Each participant will be assessed for PD response. The calculation is based on the standardized difference in means for the pharmacological effect on cGMP levels at the participant level, where a subject with a z \>= 1.645 will be considered a PD responder. A participant with a z \< 1.645 will be considered a non-responder. The PD response rate (percentage) of patients are summarized below by arm.

Time frame:
Baseline to 7 days
Reported as:
Number · percentage of patients
Pharmacodynamic (PD) Response Rate
percentage of patientsArm B (Dolcanatide)Arm A (Placebo)
Pharmacodynamic (PD) Response Rate00
SecondaryPercentage of Participants With Grade 3 or Higher Diarrhea Per National Cancer Institute Common Terminology Criteria for Adverse Events Version 4.0

The overall adverse event rates (percentages) for grade 3 or higher adverse events regardless of attribution to treatment are reported below. The percentages below are summarized for Diarrhea.

Time frame:
Up to 21 days
Reported as:
Number · percentage of patients
Percentage of Participants With Grade 3 or Higher Diarrhea Per National Cancer Institute Common Terminology Criteria for Adverse Events Version 4.0
percentage of patientsArm B (Dolcanatide)Arm A (Placebo)
Percentage of Participants With Grade 3 or Higher Diarrhea Per National Cancer Institute Common Terminology Criteria for Adverse Events Version 4.07.10

Adverse events

Collected over Up to 21 days. Non-serious events are listed at a 0% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Arm A (Placebo)0/13 (0%)0/13 (0%)4/13 (30.8%)
Arm B (Dolcanatide)0/14 (0%)0/14 (0%)11/14 (78.6%)
Most frequent other events
Showing 10 of 16
Most frequent other events
EventArm A (Placebo)Arm B (Dolcanatide)
DiarrheaGastrointestinal disorders0/1311/14
VomitingGastrointestinal disorders0/132/14
BloatingGastrointestinal disorders1/130/14
ConstipationGastrointestinal disorders1/131/14
FlatulenceGastrointestinal disorders1/131/14
Back painMusculoskeletal and connective tissue disorders1/130/14
AnxietyPsychiatric disorders1/130/14
CoughRespiratory, thoracic and mediastinal disorders1/131/14
Dry mouthGastrointestinal disorders0/131/14
DyspepsiaGastrointestinal disorders0/131/14

Baseline characteristics

Age, Continuous
Age, Continuous(years)Arm A (Placebo)Arm B (Dolcanatide)Total
Mean44.2 ± 11.6748.7 ± 5.7246.6 ± 9.19
Sex: Female, Male
Sex: Female, Male(Participants)Arm A (Placebo)Arm B (Dolcanatide)Total
Female404
Male91423
Race (NIH/OMB)
Race (NIH/OMB)(Participants)Arm A (Placebo)Arm B (Dolcanatide)Total
American Indian or Alaska Native000
Asian000
Native Hawaiian or Other Pacific Islander000
Black or African American10818
White369
More than one race000
Unknown or Not Reported000
ECOG Performance Status = 0
ECOG Performance Status = 0(Participants)Arm A (Placebo)Arm B (Dolcanatide)Total
Count of participants131427
08

Study locations

1 site
  • Thomas Jefferson University Hospital
    Philadelphia, Pennsylvania 19107, United States
09

References and documents

Study documents

  • Protocol and statistical analysis plan · Sep 6, 2018

Documents are hosted by the registry — open the source record to download them.

10

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Ran from Jul 2018 to primary completion in Jan 2019, 5 months.

Results were first posted in Dec 2019, 11 months after primary completion.

Of 141 non-industry phase 1 interventional studies under Colorectal Neoplasms, half reached primary completion within 49 months of starting (the median), counting those still running; a quarter within 31 and three quarters within 77. This study's 5 months is below that.

Counting every sponsor, half of 342 studies reached it within 49 months; a quarter within 32 and three quarters within 77.

How these figures are worked out, and which studies are left out of them.

Registered
Oct 2, 2017
First posted
Oct 3, 2017
StartActual
Jul 27, 2018
Primary completionActual
Jan 2, 2019
CompletionActual
May 17, 2021
Results first posted
Dec 17, 2019
Last update
Jun 14, 2021
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Jun 14, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT03300570
Responsible party
Sponsor
First posted
Oct 3, 2017
Start date
Jul 27, 2018
Primary completion
Jan 2, 2019
Completion
May 17, 2021
Results posted
Dec 17, 2019
Last update
Jun 14, 2021

Study contacts

David S Weinberg
principal investigator · Mayo Clinic

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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