ProHance

ProHance is indicated for magnetic resonance imaging (MRI) in adults and pediatric patients including term neonates to visualize lesions with disrupted blood brain barrier and/or abnormal vascularity in the brain (intracranial lesions), spine and associated tissues.

ProHance is indicated for MRI in adults to visualize lesions in the head and neck.

The recommended dose for adult and pediatric patients, including term neonates, is 0.2 mL/kg (0.1 mmol/kg) administered as a rapid intravenous infusion (10 mL/min to 60 mL/min) or bolus (greater than 60 mL/min). Table 1 provides weight-adjusted recommended dose volumes.

MRI of the CNS in Adults:

• A supplementary dose of 0.4 mL/kg (0.2 mmol/kg) may be given up to 30 minutes after the first dose in adult patients with normal renal function suspected of having poorly visualized CNS lesions, in the presence of negative or equivocal scans
• The safety and efficacy of supplementary dosing have not been established in pediatric patients

• Visually inspect ProHance for particulate matter and discoloration prior to use
• Do not administer the solution if it is discolored or particulate matter is present
• Concurrent medications or parenteral nutrition should not be physically mixed with contrast agents and should not be administered in the same intravenous line because of the potential for chemical incompatibility
• Inject at least a 5 mL normal saline flush immediately after ProHance injection to ensure complete administration
• Imaging procedures should be completed within 1 hour

NOT FOR DIRECT INFUSION
The pharmacy bulk package is used as a multiple dose container with an appropriate transfer device to fill empty sterile syringes. Use the following procedures when transferring ProHance from the pharmacy bulk package to individual syringes:

• Use of this product is restricted to a suitable work area, such as a laminar flow hood, utilizing aseptic technique
• Prior to entering the vial, remove the seal and cleanse the rubber closure with a suitable antiseptic agent
• The container closure may be penetrated only one time, utilizing a suitable transfer device or dispensing set that allows measured dispensing of the contents
• Once the pharmacy bulk package is punctured, it should not be removed from the aseptic work area during the entire period of use
• Withdrawal of container contents should be accomplished without delay. A maximum time of 8 hours from initial closure entry is permitted to complete fluid transfer operations
• Any unused contents must be discarded by 8 hours after initial puncture of the bulk package
• Once drawn into syringe, administer transferred agent promptly for single-dose administration

Intrathecal administration of GBCAs can cause serious adverse reactions including death, coma, encephalopathy, and seizures. The safety and effectiveness of ProHance have not been established with intrathecal use. ProHance is not approved for intrathecal use [see Dosage and Administration (2.1)].

GBCAs increase the risk for nephrogenic systemic fibrosis (NSF) among patients with impaired elimination of the drugs. Avoid use of ProHance among these patients unless the diagnostic information is essential and not available with non-contrast MRI or other modalities. The GBCA-associated NSF risk appears highest for patients with chronic, severe kidney disease (GFR less than 30 mL/min/1.73m²) as well as patients with acute kidney injury. The risk appears lower for patients with chronic, moderate kidney disease (GFR 30-59 mL/min/1.73m²) and little, if any, for patients with chronic, mild kidney disease (GFR 60-89 mL/min/1.73m²). NSF may result in fatal or debilitating fibrosis affecting the skin, muscle and internal organs. Report any diagnosis of NSF following ProHance Multipack administration to Bracco Diagnostics (1-800-257-5181) or FDA (1-800-FDA-1088 or www.fda.gov/medwatch).

Screen patients for acute kidney injury and other conditions that may reduce renal function. Features of acute kidney injury consist of rapid (over hours to days) and usually reversible decrease in kidney function, commonly in the setting of surgery, severe infection, injury or drug-induced kidney toxicity. Serum creatinine levels and estimated GFR may not reliably assess renal function in the setting of acute kidney injury. For patients at risk for chronically reduced renal function (for example, age greater than 60 years, diabetes mellitus or chronic hypertension), estimate the GFR through laboratory testing.

Among the factors that may increase the risk for NSF are repeated or higher than recommended doses of a GBCA and the degree of renal impairment at the time of exposure. Record the specific GBCA and the dose administered to a patient. For patients at highest risk for NSF, do not exceed the recommended ProHance dose and allow a sufficient period of time for elimination of the drug prior to re-administration. For patients receiving hemodialysis, physicians may consider the prompt initiation of hemodialysis following the administration of a GBCA in order to enhance the contrast agent’s Page 4 elimination. The usefulness of hemodialysis in the prevention of NSF is unknown [see Clinical Pharmacology (12)].

Anaphylactic and anaphylactoid reactions have been reported, involving cardiovascular, respiratory, and/or cutaneous manifestations. Some patients experienced circulatory collapse and died. In most cases, initial symptoms occurred within minutes of ProHance administration and resolved with prompt emergency treatment.

Prior to ProHance administration, ensure the availability of trained personnel and medications to treat hypersensitivity reactions. Consider the risk for hypersensitivity reactions, especially in patients with a history of hypersensitivity reactions or a history of asthma or other allergic disorders. If such a reaction occurs, stop ProHance and immediately begin appropriate therapy. Observe patients for signs and symptoms of a hypersensitivity reaction during and for up to 2 hours after ProHance administration.

Gadolinium is retained for months or years in several organs. The highest concentrations (nanomoles per gram of tissue) have been identified in the bone, followed by other organs (e.g. brain, skin, kidney, liver, and spleen). The duration of retention also varies by tissue and is longest in bone. Linear GBCAs cause more retention than macrocyclic GBCAs. At equivalent doses, retention varies among the linear agents with Omniscan (gadodiamide) and Optimark (gadoversetamide) causing greater retention than other linear agents [Eovist (gadoxetate disodium), Magnevist (gadopentetate dimeglumine), MultiHance (gadobenate dimeglumine)]. Retention is lowest and similar among the macrocyclic GBCAs [Dotarem (gadoterate meglumine), Gadavist (gadobutrol), ProHance (gadoteridol)].

Consequences of gadolinium retention in the brain have not been established. Pathologic and clinical consequences of GBCA administration and retention in skin and other organs have been established in patients with impaired renal function [see Warnings and Precautions (5.2)]. There are rare reports of pathologic skin changes in patients with normal renal function. Adverse events involving multiple organ systems have been reported in patients with normal renal function without an established causal link to gadolinium retention [see Adverse Reactions (6.2)].

While clinical consequences of gadolinium retention have not been established in patients with normal renal function, certain patients might be at higher risk. These include patients requiring multiple lifetime doses, pregnant and pediatric patients, and patients with inflammatory conditions. Consider the retention characteristics of the agent when choosing a GBCA for these patients. Minimize repetitive GBCA imaging studies, particularly closely spaced studies when possible.

In patients with chronically reduced renal function, acute kidney injury requiring dialysis has occurred with the use of GBCAs. The risk of acute kidney injury may increase with increasing dose of the contrast agent; administer the lowest dose necessary for adequate imaging.

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

The adverse events described in this section were observed in clinical trials involving 3174 subjects (including 2896 adults and 278 pediatric subjects ages 0 to 17 years) exposed to ProHance. Approximately 48% of the subjects were men and ethnic distribution was 78% Caucasian, 6% Black, 3% Hispanic, 6% Asian, and 2% other. In 5% of the subjects, race was not reported. Average age was 47 years (range from 1 day to 91 years) and the exposure ranged from 0.03 to 0.3 mmol/kg.

Overall, approximately 5.8% of subjects reported one or more adverse reactions during a follow-up period that ranged from 24 hours to 7 days after ProHance administration.

The following adverse reactions have been identified during post approval use of ProHance or other GBCAs that were not observed in the clinical trials. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Risk Summary
GBCAs cross the placenta and result in fetal exposure and gadolinium retention. The human data on the association between GBCAs and adverse fetal outcomes are limited and inconclusive (see Data). Because of the potential risks of gadolinium to the fetus, use ProHance only if imaging is essential during pregnancy and cannot be delayed.

In animal reproduction studies in rats, gadoteridol doubled the incidence of post-implantation loss at up to 16 times the recommended human dose (RHD). There were no adverse developmental effects observed in rabbits with intravenous administration of gadoteridol during organogenesis at doses up to 19 times the recommended human dose of 0.1 mmol/kg (see Data).

The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and is 15 to 20%, respectively.

Data
Human Data
Contrast agent is visualized in the placenta and fetal tissues after maternal GBCA administration. Cohort studies and case reports on exposure to GBCAs during pregnancy have not reported a clear association between GBCAs and adverse effects in the exposed neonates. However, a retrospective cohort study, comparing pregnant women who had a GBCA MRI to pregnant women who did not have an MRI, reported a higher occurrence of stillbirths and neonatal deaths in the group receiving GBCA MRI. Limitations of this study include a lack of comparison with non-contrast MRI and lack of information about the maternal indication for MRI.

Animal Data
Gadolinium Retention
GBCAs administered to pregnant non-human primates (0.1 mmol/kg on gestational days 85 and 135) result in measurable gadolinium concentration in the offspring in bone, brain, skin, liver, kidney, and spleen for at least 7 months. GBCAs administered to pregnant mice (2 mmol/kg daily on gestational days 16 through 19) result in measurable gadolinium concentrations in the pups in bone, brain, kidney, liver, blood, muscle, and spleen at one-month postnatal age.

Reproductive Toxicology
Gadoteridol was administered in intravenous doses of 0, 0.375, 1.5, 6.0, and 10 mmol/kg/day [0.6, 2.4, 9.7, and 16 times the recommended human dose (RHD) based on body surface area (BSA)] to female rats from gestational day (GD)6 until GD17. Gadoteridol at 10 mmol/kg/day for 12 days during gestation doubled the incidence of post-implantation loss. When rats were administered 6.0 or 10.0 mmol/kg/day for 12 days, an increase in spontaneous locomotor activity was observed in the offspring. Pregnant rabbits were administered gadoteridol in intravenous doses of 0, 0.4, 1.5, and 6 mmol/kg/day (1.3, 4.8, and 19.4 times the RHD based on BSA) from GD6 to GD18. Gadoteridol increased the incidence of spontaneous abortion and early delivery in rabbits administered 6 mmol/kg/day for 13 days during gestation.

Risk Summary
There are no data on the presence of gadoteridol in human milk, the effects on the breastfed infant, or the effects on milk production. However, published lactation data on other GBCAs indicate that 0.01 to 0.04% of the maternal gadolinium dose is present in breast milk and there is limited GBCA gastrointestinal absorption in the breast-fed infant. Gadoteridol is present in rat milk (see Data). The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for ProHance and any potential adverse effects on the breastfed infant from ProHance or from the underlying maternal condition.

Data
ProHance excretion in the milk of lactating rats was evaluated at 30 minutes, 6 and 24 hours after intravenous administration of 0.1 mmol/kg of ¹⁵³Gd-gadoteridol to nursing mothers. Small amounts of compound were found in milk immediately after injection (0.14% of the ID), with the amount declining to a low level 24 hours after injection (<0.01% of the ID).

The safety and effectiveness of ProHance have been established for use with MRI to visualize lesions with abnormal blood brain barrier or abnormal vascularity of the brain, spine, and associated tissues in pediatric patients from birth, including term neonates, to 17 years of age. Pediatric use is based on evidence of effectiveness in adults and in 103 pediatric patients 2 years of age and older, in addition to experience in 125 pediatric patients birth to less than 2 years of age that supported extrapolation from adult data [see Clinical Studies (14)]. Adverse reactions in pediatric patients were similar to those reported in adults [see Adverse Reactions (6.1)].

The safety and efficacy of > 0.1 mmol/kg, and sequential and/or repeat procedures have not been studied in pediatric patients [see Indications and Usage (1) and Dosage and Administration (2)].

No case of NSF associated with ProHance or any other GBCA has been identified in pediatric patients ages 6 years and younger. Pharmacokinetic studies suggest that weight normalized clearance of ProHance is similar in pediatric patients and adults, including pediatric patients age younger than 2 years. Normal estimated GFR (eGFR) is around 30 mL/min/1.73m² at birth and increases to mature levels around 1 year of age, reflecting growth in both glomerular function and relative body surface area. Clinical studies in pediatric patients younger than 1 year of age have been conducted in patients with the following minimum eGRF; 59.37 mL/min/1.73m² (age just after birth to < 30 days), 118.84 mL/min/1.73m² (age 30 days to < 6 months), 140.44 mL/min/1.73m² (age 6 to 12 months).

Of the total number of 2673 adult subjects in clinical studies of ProHance, 22% were 65 and over. No overall differences in safety were observed between these elderly subjects and the younger subjects.

ProHance is known to be substantially excreted by the kidneys, and the risk of toxic reactions from ProHance may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, it may be useful to monitor renal function.

No ProHance dosage adjustment is recommended for patients with renal impairment. Gadoteridol can be removed from the body by hemodialysis [see Warning and Precautions (5.2) and Clinical Pharmacology (12.3)].

Gadoteridol is a paramagnetic agent and, as such, develops a magnetic moment when placed in a magnetic field. The relatively large magnetic moment produced by the paramagnetic agent results in a relatively large local magnetic field, which can enhance the relaxation rates of water protons in the vicinity of the paramagnetic agent.

In MRI, visualization of normal and pathologic brain tissue depends, in part, on variations in the radiofrequency signal intensity that occur with: 1) differences in proton density; 2) differences of the spin-lattice or longitudinal relaxation times (T1); and 3) differences in the spin-spin or transverse relaxation time (T2). When placed in a magnetic field, gadoteridol decreases T1 relaxation times in the target tissues. At recommended doses, the effect is observed with greatest sensitivity in the T1-weighted sequences.

Gadoteridol affects proton relaxation times and consequently the MR signal. Signal intensity is affected by the dose and relaxivity of the gadoteridol molecule. Consistently, for all gadolinium based contrast agents, the relaxivity of gadoteridol decreases with the increase of the magnetic field strength used in clinical MRI (0.2 – 3.0T).

Disruption of the blood-brain barrier or abnormal vascularity allows accumulation of gadoteridol in lesions such as neoplasms, abscesses, and subacute infarcts. The pharmacokinetics of gadoteridol in various lesions is not known.

The pharmacokinetics of intravenously administered gadoteridol in normal subjects conforms to a two-compartment open model.

Distribution
After intravenous administration, gadoteridol is rapidly distributed in the extracellular space. The plasma distribution volume (mean ± SD) for the non-renally impaired adults was 0.205 ± 0.025 L/kg. It is unknown if protein binding of gadoteridol occurs in vivo.

Following GBCA administration, gadolinium is present for months or years in brain, bone, skin, and other organs [see Warnings and Precautions (5.4)].

Metabolism
It is unknown if biotransformation or decomposition of gadoteridol occur in vivo.

Elimination
Gadoteridol is eliminated unchanged via the kidneys. The elimination half-life (mean ± SD) is about 1.57 ± 0.08 hours. Within 24 hours post-injection, 94.4 ± 4.8% of the dose is excreted in the urine. The renal and plasma clearance rates (1.41 ± 0.33 mL/ min/kg and 1.50 ± 0.35 mL/ min/kg, respectively) of gadoteridol are essentially identical, indicating no alteration in elimination kinetics on passage through the kidneys and that the drug is essentially cleared through the kidney. The volume of distribution (204 ± 58 mL/kg) is equal to that of extracellular water, and clearance is similar to that of substances which are subject to glomerular filtration.

Specific Populations
Gender
Gender has no clinically relevant effect on the pharmacokinetics of gadoteridol.

Geriatric
There were 7 elderly subjects receiving 0.1 (n = 3) and 0.3 mmol/kg (n = 4) dose of ProHance. The clearance was slightly lower in elderly subjects as compared to non-elderly subjects. [see Use in Specific Populations (8.5)].

Pediatric
A population pharmacokinetic analysis incorporated data from 79 subjects, 45 males and 34 females. Among 79 subjects, 41 were healthy subjects including 28 pediatric subjects between 5 years and 15 years of age. The pediatric subjects received a single intravenous dose of 0.1 mmol/kg of ProHance. From population PK model, the mean C_max was 0.66 ± 0.21 mmol/L in pediatric subjects 2 years to 6 years of age, 0.58 ± 0.06 mmol/L in pediatric subjects 6 years to 12 years of age, and 0.68 ± 0.12 mmol/L in adolescent subjects older than 12 years. The mean AUC _0-∞ was 0.74 ± 0.20 mmol/L⋅h in pediatric subjects 2 years to 6 years of age, 0.74 ± 0.09 mmol/L⋅h in pediatric subjects 6 years to 12 years of age, and 0.98 ± 0.09 mmol/L⋅h in adolescent subjects older than 12 years of age. The mean distribution half- life (t_1/2,alpha) was 0.14 ± 0.04 hours in pediatric subjects 2 years to 6 years of age, 0.18 ± 0.07 hours in pediatric subjects 6 years to 12 years of age, and 0.20 ± 0.07 hours in adolescent subjects older than 12 years of age. The mean elimination half-life (t_1/2,beta) was 1.32 ± 0.006 hours in pediatric subjects 2 years to 6 years, 1.32 ± 0.07 hours in pediatric subjects 6 years to 12 years of age, and 1.61 ± 0.19 hours in adolescent subjects older than 12 years of age. There was no significant gender-related difference in the pharmacokinetic parameters in the pediatric patients. Over 80% of the dose was recovered in urine for pediatric subjects after 10 hours. Pharmacokinetic simulations indicate similar half-life, AUC, and C_max values for ProHance in pediatric subjects less than 2 years of age when compared to those reported for adults; no age-based dose adjustment is necessary for this pediatric population.

Renal Impairment
In patients with impaired renal function, the serum half-life of gadoteridol is prolonged. After intravenous injection of 0.1 mmol/kg, the elimination half-life of gadoteridol was 10.65 ± 0.60 hours in mild to moderately impaired patients (creatinine clearance 30 to 60 mL/min) and 9.10±0.26 hours in severely impaired patients not on dialysis (creatinine clearance 10 to 30 mL/min). The mean serum clearance of gadoteridol in patients with normal renal function was 116.14 ± 26.77 mL/min, compared to 37.2 ± 16.4 mL/min in patients with mild to moderate renal impairment and 16.0 ± 3.0 mL/min in patients with severe renal impairment.

In patients with moderately and severely impaired renal function about 97% and 76% of the administered dose was recovered in the urine within 7 days and 14 days, respectively.

For patients receiving hemodialysis, physicians may consider the prompt initiation of hemodialysis following the administration of ProHance in order to enhance the contrast agent’s elimination. Seventy- two percent (72%) of gadoteridol is removed from the body after the first dialysis, 91% after the second dialysis, and 98% after the third dialysis session. [See Warnings and Precautions (5.2) and Use in Specific Populations (8.6).]

No animal studies have been performed to evaluate the carcinogenic potential of gadoteridol.

No changes in reproductive performance and outcome of pregnancy were caused in rats and rabbits by daily intravenous administration of ProHance to parent animals before and during gestation up to 1.5 mmol/kg/day (15 times the recommended human dose).

Gadoteridol did not demonstrate genotoxic activity in: bacterial reverse mutation assays using Salmonella typhimurium and Escherichia coli; a mouse lymphoma forward mutation assay; an in vitro cytogenetic assay measuring chromosomal aberration frequencies in Chinese hamster ovary cells; and an in vivo mouse micronucleus assay at intravenous doses up to 5.0 mmol/kg.

ProHance was evaluated in two multicenter trials of 310 evaluable patients suspected of having neurological pathology. After the administration of ProHance 0.1 mmol/kg IV, the results were similar to those described below [see Clinical Studies (14.2)].

In another multicenter study of 49 evaluable adult patients with known intracranial tumor with high suspicion of having cerebral metastases, two doses of ProHance were administered. First ProHance 0.1 mmol/kg was injected followed 30 minutes later with 0.2 mmol/kg. In comparison to the 0.1 mmol/kg dose alone, the addition of the 0.2 mmol/kg dose improved visualization in 67% and improved border definition in 56% of patients. In comparison to non-contrast MRI, the number of lesions after 0.1 mmol/kg increased in 34% of patients. After ProHance 0.2 mmol/kg, this increased to 44%.

Pediatric Patients
ProHance was evaluated in a multicenter study of 103 patients undergoing brain or spine MRI. Among these patients, the age range was 2 to 20 years; 54 were between 2 and 12 years of age; 74% were Caucasian, 11% Black, 12% Hispanic, 2% Asian, and 2% other. ProHance was given in one single 0.1 mmol/kg dose. Repeat dosing was not studied. The results of the non-contrast and ProHance MRI scans were compared. In this database, MRI enhancement was noted in approximately 60% of the scans and additional diagnostic information in 30 to 95% of the scans.

A prospectively planned study of 125 pediatric patients younger than 2 years of age retrospectively selected was performed. These patients (70 boys and 55 girls) had an age range of 1 day to 24 months old; 17 were less than 1 month of age, 40 were between 1 month and 6 months of age, 29 were between 6 months and 12 months of age, and 39 were between 12 months and 24 months of age; 56% were Caucasian, 25% Black, 5% Asian, and 14% other. ProHance was given in one single 0.1 mmol/kg dose. Repeat dosing was not studied. Three independent, blinded readers evaluated pre-contrast MRI image sets and paired pre-plus-post-contrast MRI image sets using ProHance and rated the images according to three co-primary visualization endpoints: lesion border delineation, visualization of lesion internal morphology, and lesion contrast enhancement. All three blinded readers reported improvement in the paired image sets for each of the three co-primary endpoints.

ProHance was evaluated in two blinded read studies in a total of 133 adults who had an indication for head and neck extracranial or extraspinal MRI. These 133 adults (74 men, 59 women) had a mean age of 53 with a range of 19 to 76 years. Of these patients, 85% were Caucasian, 13% Black, 2% Asian, and less than 1% other. The results of the non-contrast and contrast MRI scans were compared. Approximately 75-82% of the scans were enhanced, 45-48% of the scans provided additional diagnostic information, and 8-25% of the diagnoses were changed. The relevance of the findings to disease sensitivity and specificity has not been fully evaluated.