Dosimetry of Tc-99m-Tilmanocept

  • End date
    Dec 14, 2023
  • participants needed
  • sponsor
    University of California, San Diego
Updated on 14 March 2022
Accepts healthy volunteers


This proposal will use kidney SPECT/CT of Tc-99m-tilmanocept to evaluate the mesangial changes seen in diabetics across the spectrum of kidney disease as well as persons with hypertensive kidney disease, the next most common cause of kidney disease in patients with diabetes. We aim to demonstrate that these different disease types and stages can be differentiated with Tc-99m-tilmanocept SPECT/CT and can thus be used for future trials evaluating early diagnosis and treatment of diabetic nephropathy.


In this open-label, non-randomized, single center study all subjects will receive IV administration of one of 3 tilmanocept mass doses: 0.050 mg, 0.20 mg, and 0.40 mg all radiolabeled with 10 mCi technetium Tc-99m. A total of 120 subjects will be enrolled in this study. 30 subjects in each group will be recruited (total 120). Within each study group, 10 subjects will receive one of the 3 doses mentioned above.

We will start with the lowest molar dose (0.050 mg tilmanocept). Within this dose level we will first study ten patients with normal renal function (Group 1), followed by ten Group 2 patients, ten Group 3 patients, and ten Group 4 patients. This sequence will be repeated at the middle dose level (0.20 mg tilmanocept), and finally at the highest dose (0.40 mg tilmanocept).

Group 1 No evidence of CKD: Participants in this group must have an eGFR >60/ml/min/1.73m2 and a urine albumin to creatinine ratio of <30 mg/g at the time of enrollment.

Group 2 Stage 3a CKD: Participants in this must an eGFR of 45 - 60 /ml/min/1.73m2 Group 3 Stage 3b CKD: Participants in this must an eGFR of 30 - <45 /ml/min/1.73m2 Group 4 Stage 4 CKD: Participants in this must an eGFR of 15 - <30 /ml/min/1.73m2 Participants within each group will be recruited in a 1:1 fashion, of diabetic vs non diabetic, such that within each group, there will be 30 participants, 15 with diabetes and 15 without diabetes. Diabetes will be defined as a history of a hemoglobin A1c >6.5 and an on at least 1 anti-hyperglycemic agent.

In this study subjects will be asked to come in for 4 visits: A screening visit for initial determination of eligibility and evaluation of clinical status (Visit 1), a baseline visit, Day 1 (Visit 2), on the day of tilmanocept administration and imaging, a visit one day after tilmanocept administration Day 2 (Visit 3), and a 5 -7 day safety follow-up (Visit 4).

The IV administration will be performed Nuclear Medicine clinic at UCSD Medical Center, Hillcrest by an onsite Certified Nuclear Medicine Technologist or Nuclear Medicine Physician. All other visits will be done at UCSD Medical Center, La Jolla.

All the procedures listed below are experimental and considered part of the research study.

Screening Visit 1 (Day -29 to Day 0) This visit may be conducted over the phone followed by an in-person research visit for blood draw and urine collection.

  • Preliminary review of inclusion and exclusion criteria (PHS Human Studies & Clinical Trial Info for complete list)
  • Obtain signed informed consent for study participation.
  • Allocation of unique subject number; this number will be used to document the subject data in the case report forms (CRFs) and enrollment log
  • Demography - date of birth, gender, race
  • Medical/surgical history- Medical/Surgical history will be obtained on all study subjects. All relevant prior medical and surgical conditions will be recorded in the eCRFs. Documented medical conditions will also note the month and year of onset if the condition is still active
  • Concomitant Medications (within 30 days before injection)
  • Vital signs (body temperature, heart rate, blood pressure, and will be collected from the SOC visit.
  • Any clinically significant abnormal findings will be noted on the subject's medical history
  • Clinical laboratory tests - study subjects will have blood obtained for hematology, chemistry and serology (HBsAg, HCV Ab, HIV)
  • Urine collection for routine urinalysis and for pregnancy testing for women of child-bearing potential. Females of child-bearing potential are defined as women that are not surgically sterile (hysterectomy or bilateral oophorectomy) nor postmenopausal for at least 1 year prior to screening. Women who are not of childbearing potential will not require a pregnancy test
  • 24-hour urine collection for estimate of 24 hour urine creatinine clearance. Visit 2 (Prior to Tc-99m-Tilmanocept Administration) All subjects will be assessed for adverse events in an ongoing manner from the day of injection through the end of participation. The following procedures will be completed on the day of injection prior to the administration of Tc-99m-tilmanocept: a urine pregnancy test for women of child-bearing potential, assessment of adverse events, concomitant medication review, ECG within 15 minutes prior to administration of Tc-99m- tilmanocept, vital signs after at least 1 minute in a resting position (heart rate, blood pressure,respiratory rate and weight) within 15 minutes prior to administration of Tc-99m-tilmanocept, IV catheter placement (preferably the left and right antecubital veins),and pre-Dose blood draw for chemistry and hematology. In addition, a physical examination will be done. This will include examination of general appearance, skin, eyes, ears, nose, throat, head and neck (including thyroid), lungs, heart, abdomen, lymph nodes, musculoskeletal, and nervous system. Any clinically relevant finding is to be documented as baseline finding.

Lymphoseek radiolabeling kits will be purchased for Cardinal Health (see letter in the PHS Human Studies & Clinical Trials Form) and radiolabeled in the PET Production Facility in the UCSD Moores Cancer Center.

Intra-venous administration of Tc-99m-tilmanocept will be at study time 00:00. Subjects will have a 20-22- gauge intra-venous catheter placed in the antecubital vein. An intravenous T-connector extension (Medex MX453L T Conn w/MLL) will be used to allow a quantitative injection of the radiopharmaceutical with no residual trapping in the IV setup (Figure 1). The filled syringe will be connected to the catheter for a slow push (5 to 10 secs) injection. At the completion of the injection, a 10-cc sterile normal saline flush will be administered.

Dynamic planar imaging:

The subject imaging protocol is in Figure 2. The subject will be placed in the dual-headed SPECT/CT gamma camera gantry for simultaneous anterior and posterior planar imaging. The patient will be positioned so that the imaging field of the anterior and posterior camera heads cover the left ventricular cavity of the heart, all of the liver, and both the kidneys. The dynamic imaging study will start at the same time as the Tc-99m-tilmanocept injection (370 MBq,10 mCi). The dynamic study will consist of a set of planar images (anterior and posterior views) and will last for a total of 30 minutes. This acquisition will consist of:

  1. 2 sec/frame x 30 frames, then
  2. 10 sec/frame x 174 frames (ending at 30 minutes).
  3. Blood samples (5 cc) (5±0.5, 15±1.5 & 30±3 minutes post-injection) with pre-sample discard (3 cc) will be obtained from the IV line (after removal of the T-connector).

Pre- & post-urination planar images (approximately 5 minutes each) Immediately after the dynamic imaging study, 5-minute (anterior & posterior) planar images of the urinary bladder will be acquired. Upon completion of the bladder images, the patient will urinate into a pre-weighed collection jar. This can occur within 40 minutes post-injection. After urination, the patient will be repositioned in the SPECT/CT scanner for a set (anterior & posterior) post-urination images of the bladder.

Heart/liver/kidney spect (approximately 30 minutes):

This portion of the imaging will be performed on a dual headed SPECT/CT scintigraphic camera fitted with LEAP collimators. Sixty-four 1-minute projections will be acquired with a 10% window centered at 140 keV, and a 128 x 128 image matrix.

Non-imaging procedures:

  • ECG (completed before vital signs) within 15 minutes prior to Tilmanocept administration and at 30 minutes post-injection. (up to a total of 2 times at this visit)
  • Vital signs after at least 1 minute in a resting position (heart rate, blood pressure, and respiratory rate) at 5 minutes, 15 minutes, 30 minutes, 60 minutes and 90 minutes. (up to a total of 6 times at this visit)
  • Concomitant medication review.
  • Assessment and review of adverse events.

Visit 3 (One Day after Tilmanocept Administration) & Visit 4 (5 - 7 Days after Tilmanocept Administration) The subject will report to the ACTRI research clinics for both Visits 3 and 4. These visits will include (see Table 1, Vital signs after at least 1 minute in a resting position (heart rate, blood pressure, and respiratory rate), Clinical Laboratory Evaluation: chemistry, hematology, Concomitant medication review, and Assessment and review of adverse events.

Blood and urine samples:

A total of 55 ml of blood and 30 ml of urine will be collected in this study. Samples will not be saved for future research. Genetic testing will not be done on any samples.

Condition Diabetic Kidney Disease
Treatment Tc-99m-Tilmanocept
Clinical Study IdentifierNCT05241522
SponsorUniversity of California, San Diego
Last Modified on14 March 2022


Yes No Not Sure

Inclusion Criteria

Subjects will be required to satisfy the following criteria at the screening visit unless otherwise stated
The patient has provided written informed consent with HIPAA (Health Insurance Portability and Accountability Act) authorization before the initiation of any study-related procedures
The patient is at least 18 years of age at the time of consent
The patient has an ECOG performance status of Grade 0 - 2
If of childbearing potential, the patient has a negative pregnancy test within 72 hours prior to administration of Lymphoseek, has been surgically sterilized, or has been postmenopausal for at least 1 year
Subjects will have a BMI of 18 to 49.9 kg/m2, inclusive, at screening
Meets clinical criteria described in the groups section above

Exclusion Criteria

Subjects who meet any of the following criteria will be excluded from the study
The patient is pregnant or lactating
The patient has participated in another investigational drug study within 3 months prior to Day 1
The subject has another significant medical condition requiring active surgical or medical intervention whose urgency would preclude participation in this study (active cardiac or pulmonary conditions,; ongoing ischemia or cardiac symptoms, uncorrected CAD or decompensated CHF)
The subject has a Hemoglobin A1c>10.0
The subject is on greater than 4 anti-hypertensives or has a a systolic blood pressure at time of screening greater than 160mm Hg
The patient has a suspected glomerulonephirtis, not including diabetic nephropathy, or hypertensive nephrosclerosis
The subject has a history of significant hypersensitivity, intolerance, or allergy to dextran or modified forms of dextran; unless approved by the Investigator
The subject has a history or presence of an acutely abnormal ECG, which, in the Investigator's opinion, is clinically significant
The subject has exceeded yearly radioactive dose of 30 mSv
The subject has a history of drug abuse or alcohol within 2 years before dose administration
The subjects used any prescription medications within 14 days prior to Day 1, except as allowed by the inclusion criteria or as deemed acceptable by the Investigator
The subject has poor peripheral venous access
The subject has donated blood within 30 days prior to Day 1, or plasma within 2 weeks prior to Day 1
The subject has received blood products within 2 months prior to Day 1
The subject has received any radiopharmaceutical within 7 days prior to the administration of Tc 99m tilmanocept
Clear my responses

How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
  • Sign up as volunteer to help accelerate the development of new treatments and to get notified about similar trials.

You are contacting

Investigator Avatar

Primary Contact



Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

Learn more

If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

Learn more

Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

Learn more

Similar trials to consider


Browse trials for

Not finding what you're looking for?

Every year hundreds of thousands of volunteers step forward to participate in research. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.

Sign up as volunteer

user name

Added by • 



Reply by • Private

Lorem ipsum dolor sit amet consectetur, adipisicing elit. Ipsa vel nobis alias. Quae eveniet velit voluptate quo doloribus maxime et dicta in sequi, corporis quod. Ea, dolor eius? Dolore, vel!

  The passcode will expire in None.

No annotations made yet

Add a private note
  • abc Select a piece of text from the left.
  • Add notes visible only to you.
  • Send it to people through a passcode protected link.
Add a private note