68Ga/177Lu-PSMA Theranostics in Recurrent Grade 3 and Grade 4 Glioma

Inclusion Criteria: * A previous diagnosis of histologically confirmed WHO grade 3 or grade 4 glioma * Radiologically (MRI) confirmed tumor relapse/progression ≥ 12 weeks since completed radiotherapy or suspicion of recurrence where inclusion in the theranostic part of study could be indicated * Must be ≥ 18 years old * Written informed consent for study participation * Negative pregnancy test no longer than 14 days prior to enrollment * Life expectancy \> 12 weeks * Karnofsky performance status ≥ 70% (must be able to care for self after radionuclide therapy) * High tumor uptake on diagnostic imaging with 68Ga -PSMA. * Tumor not amendable for radiotherapy or surgery, and treating oncologist think that there are no other preferable systemic therapy options (e.g temozolomide, PCV or lomustine monotherapy). * Women of childbearing potential (WOCBP) defined as fertile, following menarche and until becoming post-menopausal unless permanently sterile must use adequate contraception. Permanent sterilization methods include hysterectomy, bilateral salpingectomy or bilateral oophorectomy. Adequate contraception in the current study will be the following: o Combined (estrogen and progestogen containing) hormonal contraception associated with inhibition of ovulation: * Intravaginal * transdermal * Progestogen-only hormonal contraception associated with inhibition of ovulation: * oral * injectable * implantable * intrauterine device (IUD) * intrauterine hormone-releas…