Responding to E-mailed Questions from Patients and Reviewing Diagnostic Criteria for Café-Au-Lait Spots and Groin Freckling
- Published on May 07, 2015
- Written by Bruce Korf
Because most of the people who contact me have questions about clinical features that might indicate NF – or they have already received a diagnosis and need a plan of treatment – my primary goal is to connect them with a qualified specialist in their area whenever possible, and I always stress in my response the importance of identifying a trusted clinician in the region. Fortunately, specialists can be found relatively easily in most major U.S. cities. For patients and families seeking assistance in locating a specialist, the Children’s Tumor Foundation (www.ctf.org) web site features a patient information tab that provides a list of specialists within the U.S.
However, finding a qualified NF specialist often can be challenging, especially for people in other countries. In many regions of the U.S., and in many other countries, there is not ready access to NF specialists, and some physicians with the clinical knowledge to make an NF diagnosis may lack experience in managing complications and developing a treatment plan. For these reasons, NF-related discussion boards and chat rooms have proven to be a valuable resource for patients and families seeking information and guidance.
Because I understand the importance of helping people gain access to accurate information about NF, I’m always glad to respond to any e-mailed questions I receive and consider it a privilege to communicate with patients who have NF-related concerns. However, I can’t provide specific medical advice to people whom I have not personally examined and whose records I have not reviewed. Many people who e-mail me often attach photos, for example of café-au-lait spots, usually taken with a cell phone. Most of these photos are difficult to interpret, and it’s important not to give advice based on the limited information provided in an e-mail or photo. Instead, I focus on providing general information about NF that is not specific to their situation – perhaps about the value of genetic testing or a review of different treatment approaches.
Regarding the numerous e-mailed questions I receive asking if a child with café-au-lait spots has NF, the majority describe children in whom a diagnosis of NF is not obvious. Parents of these children are usually distraught about the possibility of NF based on the presence café-au-lait spots, which may have been noticed by a pediatrician or other clinician. Frequently, I have the impression that most are healthy children with a few spots that don’t fulfill the diagnostic criteria requiring six or more café-au-lait spots. It is important to note that the vast majority of people with NF1 have this number of café-au-lait spots or more. Sometimes, infants can develop café-au-lait spots, but café-au-lait spots usually begin to appear in the first few weeks of life. By two years of age, a child with NF will have at least six café-au-lait spots, if they ever will. It’s important to note that a young child with six or more café-au-lait spots that are clear usually will have NF1 that can be confirmed with genetic testing. In my clinical experience, many children with between one and three spots usually don’t have NF.
There are some people with variant forms of NF who have fewer than six café-au-lait spots. Some of these individuals develop internal neurofibromas, but have few visible on the skin. Legius Syndrome is another condition that causes café-au-lait spots, although these individuals do not develop tumors; this is a benign condition that is much more rare than NF1, and genetic testing is required to confirm it. Also, there are other conditions that can produce café-au-lait spots, though most are rare. It should also be noted that some healthy people can have up to six spots with no other symptoms.
Freckling in the groin and under the arms is another feature used to confirm an NF1 diagnosis. While some parents may worry based on the presence of a few small freckles in these regions, it’s important to note that NF-related freckling appears between three and five years of age. Instead of a few tiny freckles in these regions, there are usually many freckles in the region, as if paint were spattered from a paint brush. Also, a café-au-lait spot that happens to appear under the arm or in the groin does not count as a skin fold freckle.
Because NF-related features such as café-au-lait spots and groin and underarm freckling are sometimes over-interpreted and often a source of unnecessary anxiety, it’s important to identify an experienced clinician who can make a recommendation about diagnosis and the use of genetic testing for NF based on the presence of specific clinical criteria. My continued objective in responding to e-mailed questions is to provide patients with accurate information about NF and assist them in identifying an experienced, trusted clinician who can provide additional information and guidance.
Measurement Technique for Dermal Neurofibromas Validated at UAB Expands Possibilities for Clinical Trials
- Published on April 03, 2015
- Written by Bruce Korf
The basis for focusing on plexiform neurofibromas thus far in clinical trials centers on three issues: first, complications of plexiforms are often more serious than for dermal neurofibromas and can sometimes be life-threatening; second, the several mouse models for testing drug effectiveness in plexiform neurofibromas are better established than the model currently available for dermal neurofibromas; and the technology for measuring dermal neurofibromas is not as advanced as for plexiforms, making it more difficult to determine the effectiveness of a specific drug on tumor growth. The good news is that the UAB NF Program has worked with collaborators recently to establish the validity of a measurement technique for dermal neurofibromas, and this method will enable the development of future clinical trials focused on testing the effectiveness of drugs in slowing or reversing the growth of these types of tumors.
In providing a more thorough explanation about the future of clinical trials for dermal neurofibromas, it’s first helpful to understand the significant differences between dermal and plexiform neurofibromas. Dermal neurofibromas are soft, benign tumors that develop under the skin. These tumors typically appear after puberty and grow slowly over a period of time. While they are variable in size and number, dermal neurofibromas can be disfiguring in some patients, causing embarrassment and problems with self-esteem. In fact, the unpredictability of dermal neurofibromas can be the most daunting aspect of this NF feature; some individuals have few or none, while others’ bodies may be completely covered. Many women with NF1 experience increased growth of neurofibromas during pregnancy, suggesting that hormonal changes may be related to their development.
The treatment approach for dermal neurofibromas is dependent on the number and location of tumors, although the most common approach is to leave them alone due to their benign nature and the low risk of medical problems. The most common treatment is surgical removal of individual tumors using either conventional plastic surgery, laser treatment, or a procedure called electrodessication that uses an electrical current to remove a large number of tumors at one time. While these treatments can be effective, each can leave scarring and none of the options prevents additional tumor development.
Plexiform neurofibromas are congenital tumors that often first appear in infancy or early childhood as a soft swelling under the skin. Affecting about 50% of people with NF1, these tumors are frequently larger and usually involve multiple branches of large nerves. Depending on their location, plexiform neurofibromas can lead to abnormal bone growth or pressure on nerves, blood vessels, or organs. For example, plexiform neurofibromas along the spine can compress the spinal cord, leading to weakness, pain, and sometimes paralysis. Surgical removal can reduce the overall size of the tumor, although it will not stop the tumor from growing.
Because the symptoms of plexiforms can be urgent and potentially life-threatening, this feature has been given greater priority over dermal neurofibromas in clinical trials. Plexiform and dermal neurofibromas are similar at the cellular level, however, so the hope is that some treatments for plexiforms may also be effective for dermal neurofibromas.
Until recently, the challenge in testing the effectiveness of specific drugs for the treatment of dermal neurofibromas has centered on the difficulty of obtaining accurate measurements of these tumors. Unlike plexiforms that grow quickly and can be measured relatively easily with imaging studies, the slower growth rate and configuration of dermal neurofibromas make them difficult to measure accurately.
In collaboration with a research group in Brazil, scientists in the UAB NF Program have tested a measurement method over the past several years that recently has been validated as providing an accurate estimate of dermal neurofibromas (Publication). Using adhesive paper frames with a 10 cm x 10 cm window cut-out, a group of patients’ dermal tumors were documented and measured by attaching the paper frame to a specific region identified by a physical landmark that was photographed; this procedure allowed us to measure growth of dermal neurofibromas over a period of time.
This recently validated measurement technique for dermal neurofibromas has opened the door to conducting clinical trials focused on testing medications to treat this feature that is problematic for so many NF patients. We are now exploring the possibility of conducting a small, independent pilot trial to determine the effectiveness of a treatment for dermal neurofibromas. Also, we have plans to design a secondary arm of a clinical trial for plexiform neurofibromas that would test the effectiveness of the medication on dermal neurofibromas. As a secondary endpoint within this trial, individuals with plexiform neurofibromas would undergo measurements of dermal neurofibromas over a period of time to determine if the medication has had an effect on slowing the growth.
We still do not know when there will be effective treatments for the various aspects of neurofibromatosis. Those with dermal neurofibromas should know that this aspect of the condition is not being ignored, and I am hopeful that clinical trials for dermal tumors will become a reality soon.
Birmingham Family Affected by NF Recognized at CTF BeNeFit II Gala in Detroit, and Frequently Asked Patient Questions Regarding NF Clinical Trials
- Published on January 06, 2015
- Written by Bruce Korf
As a new year begins, we at UAB continue our commitment to advancing and facilitating research for all forms of neurofibromatosis. In support of this commitment, UAB serves as the national coordinating center for the NF Clinical Trials Consortium, a collaborative group of 17 medical centers across the country (and one in Australia) dedicated to conducting clinical trials of the most promising drug therapies for all forms of neurofibromatosis. During the NF Clinical Trials Consortium steering committee meeting held last month in Baltimore, discussions were held regarding selection criteria for topics of upcoming clinical trials. Frequently, two specific questions that arise from NF patients regarding clinical trials are: Why are the entry criteria for clinical trials so strict?; and Why aren’t more clinical trials conducted for more features of NF?
Regarding the first question, it is understandable that many NF patients are interested in participating in clinical trials to assist in advancing research and to receive drug therapies that might be beneficial in treating a specific feature of NF. The purpose of a clinical trial is to conduct a test of a specific medication to determine if it has a potential benefit. It’s important to understand that clinical trials must be conducted according to strict protocols, and in the case of new drugs, the trials are monitored by the FDA. Also, data have to be collected with strict adherence to the protocols to ensure that results are valid and usable. If a trial proves to be effective, a specific drug could be made available to a wide number of people, instead of just the few individuals who participated in a specific trial. Strict entry criteria must be maintained to ensure the validity and reliability of the clinical trial, which in the long run benefits the entire NF community. These criteria include: A confirmed diagnosis of NF; the confirmed presence of the NF characteristic(s) being investigated in the trial; and the absence of a prohibitive medical history, such as reduced kidney or liver function or other medical conditions that could compromise the study results or endanger the study participant. Because of these strict entry criteria, some NF patients are not eligible for a certain clinical trial. While this can be disappointing for these patients, it is important to remember that accepting only those patients into the trial who fit the specific criteria ensures the reliability of the trial and safeguards the potential of making a specific beneficial drug available to larger number of NF patients.
Some NF patients find it frustrating that the complications they are experiencing may not be the subject of a clinical trial and often ask how the focus of a clinical trial is determined. This is an important question, and it should be emphasized that we are interested in conducting clinical trials for all forms of NF. Because financial resources for conducting clinical trials are limited, with the minimum average cost of a trial in the hundreds of thousands of dollars, decisions regarding the focus of a clinical trial are made according to specific criteria. We are also mindful of the fact that the NF patient community is relatively small, and we want to make sure that clinical trials are done for the most promising treatments, so that we don’t overwhelm the community with trials that have little chance of working. Generally, features that are potentially life-threatening are given greater priority, such as plexiform neurofibromas and malignancies. The NF Clinical Trials Consortium Steering Committee determines the focus of a clinical trial based on the following criteria: The degree to which a specific feature of NF is problematic or life-threatening; the availability of a drug that might be effective (based on previous animal model studies); and the prevalence and availability of patients with the NF feature. The recommendations of the Steering Committee are then reviewed by an external scientific review panel and also by an external oversight committee appointed by the Department of Defense, which is the sponsor for the Consortium.
In using specific definable criteria for selecting the focus of clinical trials and the participants to whom drug therapies are administered, we’re ensuring that the results of these important studies are valid, reliable, and can ultimately be used to identify the most promising drug therapies for all forms of neurofibromatosis.
- Highlights of NF Family Day and Encouraging Developments from an International NF Meeting
- Upcoming NF Family Day, Research Advances, and a Special Award for a Birmingham Family Affected by NF
- A Successful NF Walk, Two Key NF Conferences, and Rapid Research Progress
- A new website and Birmingham's first NF walk