The aim of the present feasibility study of a new short palliative radiotherapy regime that apply to patients with metastatic hormone refractory prostate cancer (HRPC) presenting with a dominating debilitating symptom. Diffusion weighted magnetic resonance imaging (DWI) will apply to identify both the lesion and the most aggressive part of the lesion. The symptomatic lesions will be treated with a dose of 4 x 5 Gy, while for the most aggressive part of the lesion the dose will be escalated to 4 x 7 Gy using a simultaneous integrated boost (SIB) technique.

Please refer to uploaded Study Protocol

Inclusion Criteria:

1. Patients with hormone refractory biopsy proven prostate cancer
2. Presenting with a dominating debilitating symptom
3. Expected median survival of 12 months
4. Focal irradiation of lesion is feasible
5. Systemic therapy according to guidelines
6. age ≥18 years
7. Legal capacity, able to understand consequences of the trial
8. Written informed consent

Exclusion Criteria:

1. Relevant comorbidity (limiting radiotherapy according to protocol)
2. Prior radiotherapy limitations to administer radiotherapy according to protocol
3. No large metal implants in vicinity of lesion
4. Department dose constraints for normal tissue can't be met
5. Large bony lesions with extensive osseous destruction
6. Patients symptoms do not correlate with MR findings

Defined in Partner Agreement Contract

1. august 2018

Innocan Partners