Developing an evidence base for trials in genetic frontotemporal dementia - measures of disease onset and progression

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Frontotemporal dementia (FTD) is a common cause of young onset dementia. The only known risk factors for FTD at present are genetic with three genes accounting for the majority of familial FTD, called progranulin, tau and chromosome 9 open reading frame 72. There are now promising avenues for treatment of these disorders but we still do not know when drugs should be started or how we should measure the response to treatment. This study plans to investigate people who have genetic FTD, including both people who have developed symptoms and also people who have a risk of developing symptoms in the future because they carry the abnormal genetic mutation. This allows a window into the earliest changes in the disease process. 30 study subjects from families with genetic FTD will have psychology testing, brain imaging, blood tests and spinal fluid collection annually at three time-points in order to investigate the patterns of change in these different tests at different stages of the disorder. Brain imaging will include not only magnetic resonance imaging but also the novel technique of tau positron emission tomography which may be able to identify the presence of tau pathology in the brains of people with tau mutations for the first time during life. The study subjects will be part of a larger multicentre study called the Genetic Frontotemporal dementia Initiative (GENFI) and data will be available for analysis from over 300 subjects who take part in that initiative. The key outcomes of the study will be to develop markers which help identify the disease at its earliest stage as well as markers that allow the progression of the disease to be tracked. These markers can then be used in future clinical trials of drugs in genetic FTD.