Somatostatin Receptor Imaging in Patients With Suspected Cardiac Sarcoidosis
Phase: NA
Conditions: Sarcoidosis
Sponsor: Marcelo F. Di Carli, MD, FACC

1 
 
Somatostatin Receptor Imaging in Patients with Suspected Cardiac Sarcoidosis 
 
 
Investigator-initiated, single-center, prospective, pilot study 
 
 
Investigators: 
 
Paco Bravo, MD, Mi-Ae Park, PhD, Robert F. Padera, MD, PhD, Ron Blankstein, MD,  
Marcelo Di Carli, MD 
 
 
Institution: 
Brigham and Women’s Hospital (BWH) 
Boston, MA 
 
 Sponsor (partial support): 
Radiological Society of North America (RSNA) 
 
Pharmaceutical Sponsor (partial support): 
Mallinckrodt Pharmaceuticals  
St. Louis, Missouri 
 
 
7/1/2015 
Revised 8/19/2015 
Revised 9/9/2015 
Revised 12/17/2015 
Revised 12/31/2015 
Revised 1/8/2016 
Revised 1/27/2016 
Revised 5/19/2016 
Revised 8/5/2016 
Revised 9/2/2016 
Revised 2/24/2017 
Revised 3/13/2017 

2 
 
I. BACKGROUND AND SIGNIFICANCE 
a. Historical Background 
Sarcoidosis is a complex inflammatory disease capable of affecting any body organ, including the heart, for which 
neither the cause nor the cure is known. The United States adjusted annual incidence of sarcoidosis per 100,000 
persons is 35.5 cases in African Americans and 10.9 cases in Caucasians 1. According to post-mortem studies, 
cardiac involvement is responsible for up to 50% of the deaths related to sarcoidosis 1-3.  Detection of cardiac 
sarcoidosis is of extreme clinical importance because implantable cardioverter defibrillators (ICD) are 
recommended in virtually all of these patients to prevent sudden cardiac death4. Unfortunately, ante-mortem 
recognition is challenging and there is no expert consensus on the optimal diagnostic modality for cardiac 
sarcoidosis 5, 6.  
A novel imaging approach is needed because the clinical diagnosis of cardiac sarcoidosis is cumbersome. Heart 
biopsy, the natural gold standard, is rarely performed because of the risks involved with the procedure, and its 
poor sensitivity due to sampling error, given the patchy nature of the disease7. Non-invasive imaging modalities 
such as positron emission tomography (PET) using Fluorine-18 fluorodeoxyglucose (FDG) and cardiac magnetic 
resonance (CMR) with late Gadolinium enhancement (LGE) have emerged as alternative diagnostic tools for the 
evaluation of patients with suspected cardiac sarcoidosis8, 9. However, these imaging modalities are non-specific 
for the identification of cardiac sarcoidosis and have logistic and technical limitations, which have prevented these 
images from becoming standard of care. 
b. Previous pre-clinical or clinical studies 
Somatostatin receptor-targeted imaging with either Indium-111 Pentreotide (OctreoScan) or Gallium-68 DOTA-
Tyr3-octreotate (DOTATATE)  has been used in the past for imaging extra-cardiac sarcoidosis. OctreoScan and 
DOTATATE are both radiopharmaceuticals that bind preferentially to somatostatin receptor subtype-2 (sst-2) on 
the cell surface.  Octreoscan is Food and Drug Administration (FDA)-approved for localization of primary and 
metastatic neuroendocrine tumors bearing somatostatin receptors.  Similarly, DOTATATE, a tracer that is widely 
used in Europe for diagnosis and monitoring therapy of neuroendocrine tumors, also recently received FDA 
approval in the U.S. for clinical use.10  
Importantly, previous immunohistochemistry studies have confirmed that sst-2 is over-expressed in in biopsy-
proven sites with sarcoidosis as well 10, 11, and at least 3 studies, including a total of 53 patients demonstrated that 
OctreoScan uptake was significantly increased in 52 out of 53 of patients with sarcoidosis mainly located in the 
lung, mediastinal and hilar lymph nodes12-14.  However, OctreoScan and DOTATATE have not yet been 
systematically utilized for imaging of cardiac sarcoidosis, although, most recently, the potential feasibility of 
somatostatin receptor imaging was depicted in a series of cases.16, 17  
 
c. Study Rationale 
We believe that OctreoScan and/or DOTATATE may be of diagnostic value in cardiac sarcoidosis due to the 
following: 1) intense OctreoScan uptake has been previously shown in the lung and lymph nodes of patients with 
sarcoidosis 12-14, 2) recently, a case series showed increased DOTATATE uptake in the heart of patients with 
inflammatory myocardium, including sarcoidosis17 3) unlike LGE-CMR, OctreoScan and DOTATATE can be 
safely used in patients with cardiac devices, and/or renal failure, and 4) unlike FDG-PET, OctreoScan has an 
advantageous biodistribution for cardiac imaging due to a seemingly low level uptake under baseline conditions 
(Figure 1)18,19.   
 
 
 
 

3 
 
 
 
However, to date no studies have systematically evaluated the level of uptake of somatostatin receptor ligands in 
the heart under baseline conditions, which is necessary before investigating any pathologic accumulation.     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 2. For this reason we 
studied 15 consecutive adult 

4 
 
patients (7 men and 8 women, mean age 62 years) who underwent OctreoScan with SPECT/CT of the chest for a 
clinical indication between the periods of April and November of 2013 at the University of Washington in Seattle. 
Most common clinical indication was detection of local and/or metastatic neuroendocrine tumors. Patients were 
injected with ~ 6 mCi of OctreoScan, and SPECT/CT of the chest was acquired 24 hr post-injection.  OctreoScan 
uptake was semiquantitatively calculated using a target to blood pool ratio approach. Figure 2 depicts fused 
SPECT/CT images of how this was performed. Circular region of interests (ROI) of ~20 mm diameter were 
applied to left ventricular (LV) cavity blood pool (used as background, 2A and 2D), LV anterior (2B), inferior 
(2C), lateral wall (2E) and septum (2F), as well as the lungs (not shown), liver (2G), spleen (2G) and kidneys 
(2H). Results: Visually, the myocardium exhibited indistinguishable activity compared to the LV blood pool. 
However, there was significant LV regional differences in the uptake ratio/index as shown in Table 1. The 
inferior wall and septum showed higher (above blood pool) and the lateral and anterior walls lower (below blood 
pool) uptake ratios. This is most likely due to scatter emitted from the liver and spleen (Fig 2G) into the inferior 
wall (Fig 2C) and, to a lesser extent, the inferior portion of the septum.  Likewise, identification of the septal wall 
(Fig 2F) was difficult given the lack of enough contrast definition on SPECT and CT images, for which an 
anatomical assumption was made, which makes ROI-based estimates less accurate at this location. These data 
demonstrated that under baseline conditions, OctreoScan uptake in the heart is indistinguishable from LV blood 
pool (~ 0.94 ± 0.17). These findings provide solid empirical basis for the work proposed in this project; the 
hypotheses are mechanistically plausible, clinically important, and testable. 
 
 
d. Differences between OctreoScan and DOTATATE 
There are important biological, technical, and practical differences between these radiopharmaceuticals that 
deserve a brief mention.  Like indium-111 pentetrotide (Octreoscan®), 68-gallium dotatate has similar affinity for 
the same group of somatostatin receptors in inflammatory leukocytes (preferentially somatostatin receptor 2). The 
availability of 68-gallium dotatate provides several advantages, which are highly beneficial to the patients in this 
pilot study, including: 
a. higher contrast and spatial resolution of PET/CT for detection of small lesions, which we think will result 
in improved sensitivity as compared to indium-111 pentetrotide SPECT; 
b. a nearly 75% reduction in the whole body effective radiation dose to patients from a single administration 
of gallium-68 dotatate (from 16.4 mSv for Octreoscan to 4.3 with Dotatate); 
c. convenience for patients and practical to perform. The entire gallium-68 dotatate PET imaging procedure 
takes ~2 hours in a single visit, compared to ~24 hours over 2 visits for octreoscan imaging. 
 
II. SPECIFIC AIMS 
Aim 1 
To investigate if patients with clinically suspected cardiac sarcoidosis exhibit a myocardial OctreoScan or 
DOTATATE signal high enough (heart-to-blood pool ratio ≥ 2.0) to be visually detected compared to a control 
group of individuals (expected heart-to-blood pool ratio of ~ 1.0). 
Sub-Aim1 
To evaluate whether 4-hour (early) compared to 24-hour (delayed) post-OctreoScan injection imaging yields 
similar lesion detection performance. 
Sub-Aim2 
To correlate localization and number of increased radiotracer foci between FDG-PET and OctreoScan or between 
FDG-PET and DOTATATE studies. 
Sub-Aim3 
To explore the effect of treatment on DOTATATE activity in the heart on follow-up scans 

5 
 
 
III. SUBJECT SELECTION 
We will enroll 30 adult subjects meeting the following inclusion/exclusion criteria. 
 
a. Inclusion Criteria for initial study 
- Individuals aged 18 or older 
- Documentation of biopsy-proven sarcoidosis OR patients with typical findings on FDG PET and MRI without 
previous biopsy.  
- Clinical suspicion of cardiac involvement defined as the presence of any of the following: high-degree A-V 
nodal block, complete bundle branch block, reduced left or right ventricular systolic function, any cardiac 
arrhythmia, and/or unexplained chest pain, dyspnea or syncope 
- PET/CT imaging demonstrating abnormal myocardial FDG uptake consistent with active inflammatory 
myocardium.  
 
b. Exclusion Criteria for initial study 
-Initiation of steroids or any other immunosuppressive medication(s) following the completion of FDG-PET, as 
these medications, in theory, may subsequently suppress OctreoScan or DOTATATE uptake in the heart. 
 
- Patients with history of neuroendocrine tumors (specially insulinomas) 
- Patients taking the medication Octreotide 
- Patients on total parenteral nutrition (TPN) 
- Women who are pregnant or breastfeeding 
 
c. Inclusion Criteria for participation in follow-up study with Dotatate 
-  Initial dotatate PET scan consistent with active sarcoidosis. Defined as focally increased radiotracer activity in 
at least one left ventricular wall. 
-  Being on corticosteroid therapy at a dose of ≥ 10 mg/day of oral prednisone or equivalent for at least 6 weeks 
since initial dotatate PET scan. 
  
IV. SUBJECT ENROLLMENT 
Recruitment Procedures: Potential subjects will be recruited from the following sources: 1) 
Cardiomyopathy clinic; (2) Sarcoidosis clinic and 2) Nuclear Cardiology Laboratory. 
 
Screening procedures will include daily or weekly queries for potential eligible subjects from lists of patients 
who have either undergone nuclear imaging or are scheduled to undergo imaging procedures for sarcoidosis. 
Dr. Bravo will plan on educating the Nuclear Medicine Department staff about the study (recruitment 
information) as an additional way to ensure potential eligible patients are referred to the study. Our Nuclear 
Medicine Department staff will be instructed to notify Dr. Bravo if they encounter an abnormal FDG-PET 
suggestive of active cardiac sarcoidosis, so that the study can be introduced by the nuclear technologists, 
physiologists or physicians before they leave the Nuclear Medicine facility.  
 

6 
 
If potential candidate is identified in the sarcoidosis clinic and/or cardiomyopathy clinic, patient’s doctor or 
clinic staff will introduce the study to the patient. If patient is interested in learning more about the study, Dr 
Bravo will be notified, who will further discuss the study with the patient after the conclusion of his/her 
appointment with patient’s doctor.  
 
If potential patient is identified in the Nuclear Cardiology Laboratory the day of the patient’s FDG PET scan, 
patient will be approached by one of the nuclear technologists, physiologists or physicians before they leave 
the Nuclear Medicine facility.  Only non-study staff members may approach a potential patient in this 
manner.  They can determine whether or not a patient may be interested in finding out more information and 
can refer him or her to the study team as appropriate.  In this setting, the patient may be an inpatient or 
outpatient.   
 
If deemed eligible, physicians at the Brigham and Women's hospital will be contacted personally and/or via e-
mail to explain the purpose of the study, review of its potential risks and discomforts, and the evaluation of 
whether a patient might be a candidate for the study.  After patient’s physician agrees to have their patient 
participate in the study, the patient’s physician or inpatient team member will introduce the study to 
appropriate patients and receive his/her verbal permission to be contacted by study staff.  If the patient is an 
outpatient, the physician can provide the patient a letter describing the study and a copy of the informed 
consent form.  In the letter, potential study subjects will be encouraged to call or email a study coordinator to 
indicate refusal or willingness to learn more about this study. Interested patients will be contacted by a 
member of the research study staff to discuss the protocol and to answer any questions regarding the study. 
Patients who agree to participate will be scheduled for the first study visit and imaging studies, at which point 
the PI or a co-investigator will review the informed consent form with the patient and answer any additional 
questions the patient may have.   
 
If the patient is an inpatient, the same recruitment strategy will be followed and the study team will work in 
coordination with the inpatient team and patient’s treating physicians.  The physician or inpatient team 
member will receive verbal permission from the patient to be contacted by study staff.  Only once this verbal 
permission is granted by the patient will study staff approach him/her.  
 
The male/female ratio among the subjects is expected to reflect the approximately prevalence of CAD in the 
adult population. No specific methods to enhance recruitment of minorities will be used.  Minority 
representation among study subjects is expected to reflect the prevalence of CAD among minorities and the 
patient population referred to BWH. 
 
b. Procedures for obtaining informed consent 
The Principal Investigator or one of the co-investigators will obtain consent during the study-related hospital visit.  
Consent of subjects who do not speak English will be obtained and documented following the procedures outlined 
in the PHRC Policy. 
 
V. STUDY PROCEDURES 
a. Study visits and parameters to be measured 
Enrolled patients will be prospectively imaged after injection of either the radiotracer Indium-111 Penteotride 
(OctreoScan) or DOTATATE.  We expect imaging 10 patients with OctreoScan and 20 patients with 
DOTATATE.  No one will receive both radiotracer injections. 
 
Patients will be scheduled for imaging Tuesday through Friday (no Mondays), since the dose of OctreoScan and 
DOTATATE must be requested by noon for next day delivery. Subjects will be advised to remain well hydrated 
prior to and for at least one day after tracer injection, this to reduce radiation exposure. 

7 
 
Women may participate in this study only if they are certain they are not pregnant. If the subject is a woman of 
childbearing age, a pregnancy test will be performed before OctreoScan or DOTATATE injection unless she has a 
history of total hysterectomy, is post-menopausal for more than 2 years or post-tubal ligation for more than 1 
year. 
OctreoScan Protocol 
 
Visit 1 (Screening)  
 
Review the study with the subject and obtain written informed consent and HIPAA authorization. 
 
Assign the subject a unique study number. 
 
Record demographics data. 
 
Record medical history, including a history of biopsy-proven systemic sarcoidosis, diagnosis date, and 
prior treatments. 
 
Record concomitant medications. 
 
Schedule subject for Visit 2. 
Visit 2 (Study Day 1) 
 
Subject arrives to the Nuclear Medicine Department. 
 
Concomitant medications review. 
 
Perform abbreviated physical examination. 
 
Perform and record vital signs. 
 
Place a peripheral intravenous (IV) line. 
 Perform STAT quantitative serum hCG testing prior to each administration of Octreoscan 
 
 
Administer OctreoScan IV. 
 
Observe patient for 30 minutes post OctreoScan injection. 
 
Patient is to have a break and return to the Nuclear Medicine Department in 4 hours. 
 
Perform first set of images (~90 minutes) 
 
Subject can leave the Nuclear Medicine Department 
Visit 3 (Study Day 2) 
 
Subject returns to the Nuclear Medicine Department 24 hours after OctreoScan injection 
 
Record any Adverse Experiences.  
 
Perform second set of images (~90 minutes). 
 
Subject has completed the study protocol at this point.  
Follow Up 
 
All patients will be contacted by telephone at approximately 36-48 hours following the last scan for AE 
monitoring.  
 
 
 

8 
 
Figure 3. Example of Study Visits for OctreoScan Protocol 
  
 
DOTATATE Protocol 
Visit 1 (Screening)  
 
Review the study with the subject and obtain written informed consent and HIPAA authorization. 
 
Assign the subject a unique study number. 
 
Record demographics data. 
 
Record medical history, including a history of biopsy-proven systemic sarcoidosis, diagnosis date, and 
prior treatments. 
 
Record concomitant medications. 
 
Schedule subject for Visit 2. 
Visit 2 (Study Day 1) 
 
Subject arrives to the Nuclear Medicine Department. 
 
Concomitant medications review. 
 
Perform abbreviated physical examination. 
 
Perform and record vital signs. 
 
Place a peripheral intravenous (IV) line. 
 Perform STAT quantitative serum hCG testing prior to each administration of DOTATATE 
 
 
Administer DOTATATE IV. 
 
Observe patient for 60 minutes post DOTATATE injection. 
 
Perform cardiac PET/CT scan (20 minutes) 
 
Subject can leave the Nuclear Medicine Department 
Visit 3 (Study Day 2 - OPTIONAL) 
 
Subject arrives to the Nuclear Medicine Department. 
 
Concomitant medications review. 

9 
 
 
Perform abbreviated physical examination. 
 
Perform and record vital signs. 
 
Place a peripheral intravenous (IV) line. 
 
Perform STAT quantitative serum hCG testing prior to each administration of DOTATATE 
 
 
Administer DOTATATE IV. 
 
Observe patient for 60 minutes post DOTATATE injection. 
 
Perform cardiac PET/CT scan (20 minutes) 
 
Subject can leave the Nuclear Medicine Department 
 
Follow Up 
 
All patients will be contacted by telephone at approximately 36-48 hours following the last scan for AE 
monitoring. 
 
Figure 4. Example of Study Visits for DOTATATE Protocol (~1.5 hours) 
 
 
Schedule of Assessments: 
 
Procedure 
Visit 1 
Screening  
(-56 to-1 Days) 
Visit 2 
Study Day 1 
Visit 3 
Study Day 2  
(OctreoScan 
only) 
Visit 3 
Study Day 2 
(DOTATATE 
only) 
Telephone 
Follow-up      
36-48 hrs post 
last injection 
Informed Consent 
X 
 
 
 
 
Inclusion/Exclusion 
Criteria 
X 
X 
 
 
 
Demographics 
X 
 
 
X 
 
Medical History 
X 
X 
 
X 
X 
Medication History 
X 
X 
 
X 
X 
Vital Signs 
X 
X 
X 
X 
 
Pregnancy Test  
 
X 
 
X 
 
Drug Administration 
 
X 
 
X 
 

10 
 
SPECT/CT for 
OctreoScan 
 
X 
X 
 
 
PET/CT for DOTATATE 
 
X 
 
X 
 
AE Monitoring 
 
X 
X 
X 
X 
 
b. Drugs to be used 
Study radiopharmaceutical # 1: Indium-111 Penteotride (OctreoScan). 
Storage and Dispensing:  OctreoScan will be stored at and dispensed from the hospital’s radiopharmacy. 
Dose and Route of Administration: OctreoScan will be given intravenously per product labeling at the dose (6 
mCi) recommended by the manufacturer for evaluation of patients with neuroendocrine tumors.  
 
Study radiopharmaceutical # 2:  Ga-68 DOTATATE.   
Storage and Dispensing:  DOTATATE will be dispensed from Advanced Accelerator Applications USA, Inc., NY 
10118. 
Dose and Route of Administration: DOTATATE will be given intravenously at the dose of 4.0 mCi (148 MBq).10 
c. Devices and Procedures 
 
OctreoScan Protocol 
Study Day 1 (Early Image Protocol) 
Camera type: Imaging will be performed on a Symbia T6 SPECT/CT system (Siemens Medical Solution USA 
Inc, Knoxville, TN) using a medium energy, low-penetration, parallel-hole collimator, with a 20% energy window 
centered at 173 keV and 245 keV respectively.   
 
Image acquisition Parameters: Patients will return to the nuclear medicine department 4 hours post-injection 
and undergo the following protocol: 1. Whole body pass (planar images) in the ANTERIOR and POSTERIOR 
projection from the top of the head to the mid-femur at 5 cm/min in a 256 x 1024 matrix. Total acquisition time 
for planar imaging: 40 minutes. 2. SPECT of the chest to include the entire heart. Acquisition parameters: 128 x 
128 matrix, 360° of rotation (180°/head), 23 sec per projection, 120 total projections. Total acquisition time for 
SPECT imaging: 46 minutes. 3. Low-dose CT of the chest for attenuation correction purposes will be performed 
immediately after SPECT with the following parameters:  x-ray tube current-time 50 mAs continuous, voltage 
110 kVp. Total acquisition time: 12 seconds. 
 
Imaging Processing: 
All SPECT images will be reconstructed with attenuation correction, scatter correction, and the vendor-supplied 
Flash3D reconstruction algorithm (accounting for spatially dependent resolution response) to create quantitative 
images of activity concentration (3 iterations, 8 subsets, 5.0mm post-smoothing).  
 
Study Day 2 (Delayed Image Protocol) 
Patients will return 24 hours post-injection and the same camera type, image acquisition (whole body planar 
followed by SPECT/CT of the chest) and processing protocol will be performed as in early imaging. 
 
DOTATATE Protocol 
Study Day 1 and OPTIONAL Study Day 2 

11 
 
Camera type: Imaging will be performed on a GE PET-CT scanner (Discovery RX or LightSpeed VCT 64, GE 
Healthcare, Milwaukee, WI, USA) 
Image Acquisition Parameters:  
DOTATATE will be given intravenously at the dose of 4.0 mCi (148 MBq). They will then be observed for 60 
minutes post DOTATATE injection at the nuclear medicine lab. 
 
Cardiac acquisition: Individuals will be positioned with the help of a CT topogram (grid over the heart, level of 
the carina), and a low-dose CT scan (120 kVp, 20 – 30 mA) will be acquired for attenuation correction of PET 
emission data to cover the entire chest.  This will be followed by a 20-minute ECG-gated 3-D PET acquisition of 
the chest and myocardium. 
 
Imaging Processing: 
All PET images will be reconstructed with attenuation correction (Matrix 128x128, OSEM, subsets 28, iteration 2, 
post filter 6.0 mm), and processed and reviewed using the vendor-supplied HERMES software package.  
 
d. Data to be collected and when the data is to be collected 
 
Visit 1. We will collect demographics data, medical history, prior treatments, and concomitant medications, as 
well as confirm a negative STAT quantitative serum hCG testing prior to the administration of Octreoscan or 
DOTATATE. 
 
After visit 3 for OctreoScan or after visit 2 for DOTATATE we will analyze and interpret the images as 
following: 
 
Image Interpretation for OctreoScan: 
OctreoScan uptake in the heart will be assessed both qualitative and semi-quantitatively. 
 
1. Qualitative Assessment of OctreoScan cardiac uptake: Two board-certified nuclear medicine physicians will 
review the early and delayed whole body planar and SPECT/CT images independently of each other and grade 
each image set based on OctreoScan uptake in the heart as: 1) negative, 2) borderline positive or 3) definitely 
positive. In this latter case, the number and location (relative to the left ventricular wall position) of positive 
lesions will be recorded. Similarly, FDG-PET studies (performed as part of the inclusion criteria) will be 
reviewed and the number and location of FDG-avid lesions recorded. 
 
2. Semi-quantitative assessment of OctreoScan cardiac uptake:  A heart to blood pool background ratio will be 
calculated using a circular region of interests (ROI) applied to each focus of increased radiotracer uptake 
visualized in the left ventricle on the transverse and/or coronal tomographic slice of the fused SPECT/CT images.  
A background ROI of the same size will be applied to the blood pool in the left ventricular cavity.  In addition, the 
relative myocardial contrast will be assessed with measurement of myocardial uptake in ROIs positioned in: 1) 
interventricular septum 2) lateral wall 3) anterior wall and 4) inferior wall. ROI placement will be confirmed via 
image fusion with the CT portion from the SPECT/CT study (similar to Figure 2). This qualitative and 
semiquantitative approach will be performed in both early and delayed datasets by 2 separate nuclear medicine 
physicians.   
 
Image Interpretation for DOTATATE: 
DOTATATE uptake in the heart will be assessed both qualitative and semi-quantitatively. 
 
1. Qualitative Assessment of OctreoScan cardiac uptake: Two board-certified nuclear medicine physicians will 
review the limited whole body and cardiac PET/CT images independently of each other and grade each image set 
based on DOTATATE uptake in the heart as: 1) negative, 2) borderline positive or 3) definitely positive. In this 
latter case, the number and location (relative to the left ventricular wall position) of positive lesions will be 
recorded.  

12 
 
 
2. Quantitative assessment of DOTATATE cardiac uptake:  The axial PET image slice with maximum cardiac 
uptake will be selected. A standardized 15 mm circular region will be placed over each myocardial wall area with 
the peak activity. ROI placement will be confirmed via image fusion with the CT portion from the PET/CT study. 
Each ROI will be used to derive maximum (SUVmax) and mean standardized uptake values (SUVmean). A 
background ROI of the same size will be applied to the blood pool in the left ventricular cavity, and similarly, 
SUVmax and SUVmean will be derived to serve as reference. Then, signal-to-background ratios will be 
calculated.   
This qualitative and semi-quantitative approach will be performed in both early and delayed datasets by 2 separate 
nuclear medicine physicians.   
 
BIOSTATISTICAL ANALYSIS 
 
a. Specific data variables being collected for the study 
 
Please see excel attachments 
 
b. Study endpoints 
 
Primary Endpoint: Positive or abnormal OctreoScan or DOTATATE uptake in patients with cardiac sarcoidosis 
 
Secondary Endpoint:  Differences in OctreoScan uptake at 4 hours vs. 24 hours post-radiotracer injection 
 
c. Statistical methods 
 
 
Data Ascertainment and Analysis: 
 
All statistical analysis will be done using SPSS (version 21.0). A P value <0.05 will be considered statistically 
significant for all calculations. 
 
Qualitative assessment of OctreoScan or DOTATATE cardiac uptake: First, Cohen's kappa coefficient will be 
used to examine the visual inter-rater agreement between readers.  We expect a kappa of at least 0.9 (excellent).  
Subsequently, the percentage of patients with abnormal OctreoScan or DOTATATE will be compared between 
patients with suspected sarcoidosis and those in a control group (Table 1, Figure 2) using chi2.  
 
Semiquantitative assessment of OctreoScan or DOTATATE cardiac uptake: The heart-to-blood pool ratio is a 
unitless continuous variable. We will use paired t-test to compare within group OctreoScan uptake between early 
and delayed imaging, and independent-measures t test to compare OctreoScan or DOTATATE uptake between 
patients with suspected sarcoidosis and the control group. 
We will also investigate whether delayed imaging may lead to improved lesion detection performance due to a 
higher/better target-to-background ratio compared to early imaging.  We will employ chi2 to compare if 
percentage of patients with abnormal OctreoScan varies significantly both on a patient- and lesion-basis between 
early and delayed imaging in both study groups. 
Evaluation of early vs. delay imaging: We will employ chi2 to compare if percentage of patients with abnormal 
OctreoScan varies significantly both on a patient- as well as lesion-basis between early and delayed imaging in 
both study groups. 
 
Comparison with FDG-PET:  We will also compare if foci of increased OctreoScan or DOTATATE uptake are 
similar in number and localization compared to FDG-PET scans. 
 
 
 

13 
 
Expected Results: 
 
Our main hypothesis is that OctreoScan or DOTATATE uptake in the heart will be semiquantitatively (heart-to 
blood pool ratio will be ≥ 2.0) high enough to allow visualization of OctreoScan or DOTATATE activity in 
patients with cardiac sarcoidosis, compared to the control group, where myocardial uptake will be similar to blood 
pool activity (heart-to blood pool ratio of ~ 1.0).  
 
We also believe that delayed imaging may lead to improved lesion detection performance due to a higher target-
to-background ratio compared to early imaging.   
 
Finally, we hypothesized that OctreoScan or DOTATATE will yield a similar number of abnormal cases (on a 
patient-basis) compared to FDG-PET. 
 
VII. RISKS AND DISCOMFORTS 
 
Radiation Exposure for OctreoScan Protocol:  
 
1. The radiation dose patients will receive in this study is equivalent to an exposure of 16.4 mSv to the whole 
body (for one OctreoScan injection and two CT scans). This is more than the 3 mSv that the average person in the 
United States gets each year from natural sources like the sun, outer space, air, food and soil.  It is less than the 50 
mSv of radiation that is allowed each year for people who are exposed to radiation in their jobs.  Although 
radiation may cause cancers at high doses and high dose rates, currently there are no data to establish 
unequivocally the occurrence of cancer following exposure to low doses and dose rates – below about 100 mSv. 
Therefore, the risks of low-level radiation exposure are not known but are thought to be very low. 
 
 
Radiation risks are reviewed by the Radiation Safety Committee (RSC) at BWH.  Subjects who may be pregnant 
will be excluded from this study, as radiation may cause physical or genetic damage to a fetus. Calculations are 
below: 
 
Radionuclide 
Activity Each 
Administration 
Compound and Method 
of Administration 
# Administration 
per Subject 
Total Whole-Body Dose 
per Administration 
Indium-111 
222 MBq (6 mCi) 
Pentreotide 
One 
12 mSv17 
 
 
Type of exam 
# Exams per 
subject 
Total Whole-Body Dose per 
Exam 
Low-dose CT for attenuation correction of the chest 
Two 
2.2 mSv 
 
Total effective dose estimate = 16.4 mSv (total for study)  
 
Radiation Exposure for DOTATATE Protocol:  
 
1. The radiation dose patients will receive in this study is equivalent to an exposure of 4.3 mSv to the whole body 
(for one dose of DOTATATE injection and one CT scan). This is more than the 3.0 mSv that the average person 
in the United States gets each year from natural sources like the sun, outer space, air, food and soil.  It is less than 
the 50 mSv of radiation that is allowed each year for people who are exposed to radiation in their jobs.  Although 
radiation may cause cancers at high doses and high dose rates, currently there are no data to establish 
unequivocally the occurrence of cancer following exposure to low doses and dose rates – below about 100 mSv. 
Therefore, the risks of low-level radiation exposure are not known but are thought to be very low. 
 
 

14 
 
Radiation risks are reviewed by the Radiation Safety Committee (RSC) at BWH.  Subjects who may be pregnant 
will be excluded from this study, as radiation may cause physical or genetic damage to a fetus. Calculations are 
below: 
 
Radionuclide 
Activity Each 
Administration 
Compound and Method 
of Administration 
# Administration 
per Subject 
Total Whole-Body Dose 
per Administration 
Gallium-68 
148 MBq (4 mCi) 
DOTA,Tyr3 octreotate 
One 
3.1 mSv20 
 
 
Type of exam 
# Exams per 
subject 
Total Whole-Body Dose per Exam 
Low-dose CT for attenuation correction of the chest 
One 
1.2 mSv 
 
Total effective dose estimate = 4.3 mSv (total for study)  
 
For subjects participating in the OPTIONAL second DOTATATE scan, the total effective dose will be 8.6 mSv.  
 
 
2. Side Effects: The following adverse effects have been observed in clinical trials using OctreoScan at a 
frequency of < 1% of 538 patients: dizziness, fever, flush, headache, hypotension, changes in liver enzymes, joint 
pain, nausea, sweating, and weakness. These adverse effects were transient in all cases. 
 
According to the package insert, the safety of DOTATATE has been evaluated in three single center studies and 
in a survey of the scientific literature. No serious adverse reactions were identified, including a small study there 
were no observed adverse events to the radiopharmaceutical in the immediate or delayed time frames, with a 
follow-up of 1 year.21 
 
3. Venous cathethers: Intravenous (IV) lines are required for OctreoScan or DOTATATE injection.  Their 
placement may cause bruise, temporary clotting, bleeding, redness, swelling, and potentially infection at the 
insertion site.  Some people may feel lightheaded or even faint during IV placement. 
 
4. Invasion of privacy: This is always a potential risk on any research study. 
 
 
 
 
 
Steps undertaken to minimize risks of harm and to protect subjects’ rights and welfare.   
 
1. Radiation exposure: Adequate shielding will be maintained at all times until OctreoScan or DOTATATE is 
injected to the patient. To help reduce the radiation dose to the thyroid, kidneys, bladder, and other target organs, 
patients will be encouraged to remain well hydrated before the administration of OctreoScan or DOTATATE, and 
to increase their fluid intake and void frequency for one day after administration of these drugs.  
 
If the subject is a woman of childbearing age, a pregnancy test will be performed before OctreoScan or 
DOTATATE at no cost to her unless she has a history of total hysterectomy, is post-menopausal for more than 2 
years or post tubal ligation for more than 1 year. 
 
2. Side effects: Patients will be carefully monitored throughout the imaging studies, using blood pressure 
measurements.  Serious adverse events with regard to the study protocol, any other problems or study deviations 
will be reported to the IRB within 1 week of occurrence/recognition. 
 

15 
 
3. IV line placement: Only board-certified nuclear medicine technicians,  with ample experience in phlebotomy, 
will perform all peripheral IV line placements.  
 
4. Patients privacy: The patient’s personal health information will be kept confidential, and data will be de-
identified after the last subject has been imaged. Data will be stored on a computer with access that is password-
protected, and inaccessible to those not directly involved in the study. No data will be released unless de-
identified as stipulated by HIPAA guidelines. Pregnant women and children will not be included. 
 
 
 
 
VIII. POTENTIAL BENEFITS 
 
a. Potential benefits to participating individuals 
 
There will be no direct benefits to the study subjects from participating in the study. 
 
b. Potential benefits to society  
 
This is a study aiming at evaluating a potential new imaging modality for the diagnosis of cardiac sarcoidosis.  
Diagnosis of cardiac sarcoidosis is of paramount importance since these patients are at high-risk of dying 
suddenly, and currently guidelines advocate for implantable cardioverter defibrillator (ICD) placement in patients 
with cardiac sarcoidosis. Unfortunately, this condition has been traditionally challenging to detect by standard 
diagnostic modalities.  If our hypothesis is correct, and any of the somatostatin receptor-targeted imaging agents 
work, this will have a significant impact to the society because it will aid in the identification of patients with 
cardiac sarcoidosis, a condition that carries significant morbidity and mortality.  We believe that the benefits 
clearly outweigh the risks of the proposed study given the importance of identifying patients with cardiac 
sarcoidosis. 
 
Our initial preliminary results are rather encouraging as patients who are treatment-naive show comparable levels 
of DOTATATE uptake/activity in the heart compared to FDG PET (the reference modality). However, it remains 
to be shown whether DOTATATE can also serve as a marker of therapy response on follow-up scans among 
those patients with sarcoidosis who showed abnormal cardiac DOTATATE activity in their initial scan.   
 
This is highly clinically relevant as most patients with the diagnosis of active cardiac sarcoidosis based on FDG 
PET are started on steroids (or other anti-inflammatory drugs) in an attempt to reduce the degree of inflammation 
since this can be detrimental for the heart function. 
 
Consequently, we would like to explore the effect of treatment on DOTATATE activity in the heart on follow-up 
scans.  
 
 
IX. MONITORING AND QUALITY ASSURANCE 
 
a. Safety monitoring 
 
The PI of the study will monitor the overall safety of the study and will report any adverse effect to the IRB 
immediately.  The PI will also monitor this study to ensure that subjects’ human rights, safety, and well-being are 
protected, that the study is properly conducted in adherence to the current protocol, and study data reported by the 
investigator/subinvestigator are accurate, complete and verifiable with study-related records such as source 
documents. 
 
Patients will also be called 36-48 hours after the scan to monitor for any AEs.  

16 
 
 
Safety data will be obtained at each of the two study visits from the spontaneous reports by patients of adverse 
events, vital sign monitoring, and focused physical examinations. 
 
Dr. Paco Bravo should be contacted directly at this number to report medical concerns or questions regarding 
safety. 
Phone: (410) 736-0010 
 
b. Data safety monitoring  
 
All safety data will be reviewed by the PI (Dr. Marcelo Di Carli). 
 
c. Discontinuation criteria for individual subjects  
 
Discontinued subjects are those who are enrolled in the study and for whom study treatment is terminated 
prematurely for any reason.  
 
The subject is free to withdraw from the study treatment and/or study for any reason and at any time without 
giving reason for doing so and without penalty or prejudice.  The investigator is also free to terminate a subject’s 
involvement in the study at any time if the subject’s clinical condition warrants it.  
 
Subjects will be discontinued if: 
 
Subject experiences a serious or intolerable adverse event 
 
In the Investigator’s opinion, the subject is non-compliant with the protocol requirements 
 
Subject wishes to withdraw consent 
 
Investigator elects to end the study 
 
d. Adverse event reporting guidelines 
 
Definition of Adverse Events (AEs) 
 
An adverse event (AE) is defined as any untoward medical occurrence in a subject administered a study drug, and 
which does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable 
and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with 
the use of a study drug, whether or not related to the study drug. 
 
An abnormality identified during a medical test (e.g., laboratory parameter, vital sign, ECG data, physical exam) 
should be defined as an AE only if the abnormality meets one or more of the following criteria: 
 
Induces clinical signs or symptoms 
 
Requires active intervention 
 
Requires interruption or discontinuation of study medication 
 
The abnormality or investigational value is clinically significant in the opinion of the investigator 
 
Definition of Serious Adverse Events (SAEs) 
 
A serious AE is any untoward medical occurrence that, at any dose: 
 
Results in death, 
 
Is life threatening (an event in which the subject is at risk of death at the time of the event; it does not 
refer to an event which hypothetically might have caused death if it was more severe), 
 
Results in persistent or significant disability/incapacity, 
 
Results in congenital anomaly, or birth defect, 

17 
 
 
Requires inpatient hospitalization or leads to prolongation of hospitalization (hospitalization for 
treatment/observation/examination caused by AE is to be considered as serious) 
 
Other medically important events 
 
Medical and scientific judgment will be exercised in deciding whether expedited reporting is appropriate in other 
situations, such as important medical events that may not be immediately life-threatening or result in death or 
hospitalization but may jeopardize the subject or may require intervention to prevent one of the other outcomes 
listed in the definition above. These events, including those that may result in disability, will be considered 
serious.  
 
Criteria for Causal Relationship to the Study Drug 
 
Adverse events that fall under either "Possible" or "Probable" should be defined as "adverse events whose 
relationship to the study drugs could not be ruled out." 
 
Causal relationship 
to the study drug 
Criteria for causal relationship 
 
Not Related 
A clinical event, including laboratory test abnormality, with a temporal 
relationship to drug administration which makes a causal relationship 
improbable, and/or in which other drugs, chemicals or underlying 
disease provide plausible explanations. 
 
Possible 
A clinical event, including laboratory test abnormality, with a 
reasonable time sequence to administration of the drug, but which could 
also be explained by concurrent disease or other drugs or chemicals.  
Information on drug withdrawal may be lacking or unclear. 
Probable 
A clinical event, including laboratory test abnormality, with a 
reasonable time sequence to administration of the drug, unlikely to be 
attributed to concurrent disease or other drugs or chemicals, and which 
follows a clinically reasonable response on re-administration (re-
challenge) or withdrawal (de-challenge). 
 
Criteria for Defining the Severity of an Adverse Event 
 
The following standard with 3 grades is to be used to measure the severity of adverse events, including abnormal 
clinical laboratory values. 
 
Mild: No disruption of normal daily activities 
 
Moderate: Affect normal daily activities 
 
Severe: Inability to perform daily activities 
 
Reporting of Serious Adverse Events (SAEs) 
 
In the case of a serious adverse event (SAE), the investigator will submit a report through eIRB within 5 working 
days/7 calendar days of the date the investigator first becomes aware of the problem as per Partners policy.  
 
Follow-up to Adverse Events 
 
All adverse events occurring during the study are to be followed up until resolved or judged to be no longer 
clinically significant, or until they become chronic to the extent that they can be fully characterized. 
 
If during adverse event follow-up, the adverse event progresses to an "SAE," or if a subject experiences a new 
SAE, the investigator will immediately report the information to the sponsor. 

18 
 
 
 
 
 
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