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The results of a chelation study using Ca-/Zn-DTPA to treat 25 patients diagnosed with Gadolinium Deposition Disease (GDD) will be published in the June 2018 issue of Investigative Radiology. The complete article is not freely available to the public. However, you can find the abstract of, “Intravenous Calcium-/Zinc-Diethylene Triamine Penta-Acetic Acid in Patients with Presumed Gadolinium Deposition Disease – A Preliminary Report on 25 Patients”, by Semelka et al. at https://www.ncbi.nlm.nih.gov/pubmed/29419708
According to the FDA, Calcium-DTPA (Ca-DTPA) and Zinc-DTPA (Zn-DTPA) are drug products that have been used for over 40 years to speed up excretion of the actinide elements plutonium, americium, and curium from the body. Gadolinium (Gd) is a lanthanide series element that shares a number of chemical properties with actinides. The purpose of the study was to determine if the FDA-approved actinide metal decorporation agents Ca-/Zn-DTPA could be beneficial for symptomatic patients with GDD who had retained gadolinium from the gadolinium-based contrast agents (GBCAs) that had been administered for their MRIs. (more…)
On December 19, 2017, the FDA issued an update to its Drug Safety Communication regarding brain retention of gadolinium-based contrast agents (GBCAs) used for MRIs. Despite mounting evidence that GBCAs leave gadolinium in the brain, bones, and other tissues of all patients who undergo MRIs with contrast, the FDA has decided not to suspend the use of any GBCAs. This is in stark contrast to the actions taken by the European Medicine’s Agency and the U.K.’s Medicines and Healthcare Products Regulatory Agency. Those agencies suspended the use of the linear agents Magnevist, Omniscan, and OptiMark, while requiring changes to all GBCA product labeling. The Japanese Ministry of Health, Labour and Welfare restricted the use of non-specific linear GBCAs only to cases where there is no alternative and it also required changes to product labeling.
In its Safety Alert, the FDA acknowledged that “linear GBCAs result in more retention and retention for a longer time than macrocyclic GBCAs”. However, the FDA concluded that “the benefit of all approved GBCAs continues to outweigh any potential risks”. This action was taken despite “reports of adverse events involving multiple organ systems in patients with normal kidney function”.
In response to the issue of gadolinium retention, the FDA is requiring several actions to alert health care professionals and patients about gadolinium retention after an MRI using a GBCA. These include requiring a new patient Medication Guide for each agent, providing educational information that every patient will be asked to read before receiving a GBCA, and taking actions that can help minimize problems. The FDA is also requiring manufacturers of GBCAs to conduct human and animal studies to further assess the safety of gadolinium-based contrast agents. Product labeling for all GBCAs must be changed to include new warnings and precautions.
Each GBCA will have a patient Medication Guide with agent specific information, and content that is required for all gadolinium-based contrast agents; the Medication Guide for MultiHance and ProHance have recently been released. The Radiology Department of each institution will create educational handouts that every patient will be asked to read before signing the consent form for his or her MRI or MRA with a GBCA.
Patients must be fully-informed about potential risks. (more…)
On September 8, 2017, after a day filled with presentations by drug industry representatives, medical professionals, FDA personnel, and people who have been affected by retained gadolinium, the FDA’s Medical Imaging Drugs Advisory Committee (MIDAC) took two important votes related to gadolinium-based contrast agents (GBCAs) and gadolinium retention.
First, MIDAC members agreed with the FDA’s plan to “revise the prescribing information for GBCAs as a class to include: a warning for retention for all GBCAs, with greater retention of all or some of the linear GBCAs compared to the macrocyclics in certain organs including the brain; recommended risk minimization steps for certain patient populations”. From the discussions, those populations appear to be pregnant women and children.
Second, MIDAC members agreed, that pending the results of a number of ongoing clinical and preclinical studies, the FDA “might request that manufacturers conduct additional studies that will inform our decisions about the need for further regulatory actions including withdrawal of approval and restriction of indicated populations”.
During his comments to the committee, Dr. Emanuel Kanal formally recommended that “the FDA encourage and/or support formal investigation” of our group. We hope that one or more additional studies will include members of our MRI-Gadolinium-Toxicity support group. We fully support Dr. Kanal’s recommendation since we believe people who have been affected by retained gadolinium can provide important data that is not available anywhere else.
During the meeting, no one disputed that gadolinium is toxic or that everyone who has an MRI with contrast retains an unknown amount of gadolinium. However, there is still disagreement about what, if any, long-term harm retained gadolinium might do to a patient, including someone who has evidence of gadolinium retention months and even years after his or her last contrast-enhanced MRI.
Until the September 8th MIDAC meeting, patients who believe they have been adversely affected by retained gadolinium have been left to their own devices to try to get their chronic health issues recognized as being caused by gadolinium toxicity and to find a way to remove gadolinium from their bodies. Hopefully, that will soon change.
The Center for Drug Evaluation and Research (CDER) provided a live webcast of the September 8, 2017, MIDAC meeting. A recording of the webcast can be found at the four following addresses:
Start of Meeting to Morning Break: https://collaboration.fda.gov/p7goy94tum9/
Morning Break to Lunch Break: https://collaboration.fda.gov/p25a1oiwhqd/
Lunch Break to Afternoon Break: https://collaboration.fda.gov/p96q45ae2t3/
Afternoon Break to End of Meeting: https://collaboration.fda.gov/p1qe35bmdkj/
Hubbs Grimm and I, representing The Lighthouse Project and other affected patients, are speaker #2 in the Lunch Break to Afternoon Break video. That video includes all presentations made during the Open Public Hearing portion of the meeting.
Coauthors of The Lighthouse Project provide facts about Gadolinium Toxicity to FDA Advisory Committee
As coauthors of The Lighthouse Project, we have provided written comments about the toxic effects of gadolinium and gadolinium retention in patients with normal renal function to the FDA’s Medical Imaging Drugs Advisory Committee in advance of its September 8, 2017 meeting. We will be making a brief oral presentation during the Open Public Hearing portion of the meeting which will be held at the FDA’s White Oak Campus in Silver Spring, Maryland.
Our comments are built around the following 6 major points that we cover in making the case that the FDA needs to take action regarding the use of Gadolinium-based Contrast Agents (GBCAs) administered for contrast-enhanced MRIs.
1. Medical literature documents toxicity of gadolinium and systemic implications.
2. The Risk Factors for adverse results are many.
3. NSF-Like Symptoms in patients with normal renal function.
4. Gadolinium from GBCAs does not clear the body in a few days, or even in a few months, allowing plenty of time for the Gd ion to dissociate from the chelate.
5. Underreported Symptoms from Contrast MRIs is a serious problem.
6. There is evidence of clinical implications of gadolinium deposition.
Our detailed comments can be found here: Comments-from-Lighthouse-Project-FDA-2017-N-1957 . We also included the following supporting materials:
- Sharon’s 2012 Letter to the FDA (SWilliams-2012FDALetter-FDA-2017-N-1957)
- Our Symptom Survey of the Chronic Effects of Retained Gadolinium from Contrast MRIs (Lighthouse Symptom Survey copy for Docket FDA-2017-N-1957), and
- Our most recent report, Gadolinium Retention from Contrast MRIs in 70 Cases with Normal Renal Function – 24-hour Urine Test Results (Lighthouse 70 Case Retention Study copy for Docket FDA-2017-N-1957)
We will report back later about our experience at the FDA Advisory Committee Meeting.
Sharon Williams and Hubbs Grimm