The standard treatment of glioblastoma, an aggressive brain tumour, includes radiotherapy combined with temozolomide. Based on a randomised trial, showing five months increased survival, TTF has been introduced in the management of patients with good performance status. Data from the Swedish national quality registry for CNS tumours have been analysed for TTF usage. The results demonstrate that 65 percent of the patients accepted treatment with TTF. More than half of the treated patients interrupted treatment due to low compliance or their own wish. Median treatment time was 164 days, with a range from 0 to 774 days. There was a large variation between different regions in how many patients were offered TTF treatment. A non-significant trend to better survival was seen for the group of TTF-treated patients compared to individually matched controls. In summary, TTF is a new treatment for glioblastoma, with potential to prolong survival also in real world patients. Today, the treatment is not offered equally to all patients, despite national guidelines. TTF (tumour treating fields) är en ny, nationellt godkänd utrustning, som inducerar alternerande elektriska fält och används vid behandling av hjärntumören glioblastom. Behandlingen kan vara inskränkande i vardagen, och data från det nationella registret för CNS-tumörer visar att mer än hälften av patienterna avbryter TTF på grund av dålig användningsgrad eller egen önskan. Genomsnittlig behandlingstid enligt registret är 164 dagar. Jämfört med matchade kontroller visar data från registret en trend med längre överlevnad för patienter som behandlas med TTF; dock är skillnaden inte statistiskt signifikant. Det finns en stor regional variation i andelen patienter som erbjudits behandlingen.