| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| metastatic prostate cancer |  | 
| E.1.1.1 | Medical condition in easily understood language |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Cancer [C04] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 18.0 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10036909 |  
| E.1.2 | Term | Prostate cancer metastatic |  
| E.1.2 | System Organ Class | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) |  | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| To study the effects of budesonide on the incidence of cabazitaxel induced diarrhea |  | 
| E.2.2 | Secondary objectives of the trial | 
| •	To study the effects of budesonide on other side effects of cabazitaxel (e.g. myelotoxicity) •	To study the pharmacogenetics of cabazitaxel
 
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| •	Metastatic castrate resistant prostate cancer (mCRPC) patients with documented disease progression -	If measureable disease: documented disease progression as defined in RECIST criteria v 1.1
 -	If non-measurable disease: documented rising PSA levels (at least 2 consecutive rises in PSA over a reference value taken at least 1 week apart) or appearance of new lesions
 •	Previous treatment with a docetaxel-containing regimen
 •	Age  18 years;
 •	WHO performance status  1 (see appendix B);
 •	Adequate renal and hepatic functions defined as (serum creatinin <150µmol/l (<1.7mg/dl), total bilirubin < 1.0 xULN; alanine aminotransferase (ALAT) and aspartate aminotransferase (ASAT) <1.5x ULN, in case of liver metastasis < 5 ULN; alkaline phosphatase (AF) < 5x ULN) In case of bone metastasis, AF < 10x ULN is accepted;
 •	Adequate hematological blood counts defined as (absolute neutrophil count (ANC) > 1.5 x 109/L and platelets > 100 x 109/L);
 •	Castration, either surgically or by continued LHRH agonist therapy
 •	Written informed consent according to ICH-GCP
 
 |  | 
| E.4 | Principal exclusion criteria | 
| •	Impossibility or unwillingness to take oral drugs; •	Serious illness or medical unstable condition requiring treatment, symptomatic CNS-metastases or history of psychiatric disorder that would prohibit the understanding and giving of informed consent;
 •	Use of medications or dietary supplements known to induce or inhibit CYP3A (see section 5.11)
 •	Use of hormonal agents other than Gn-RH agonists
 •	Chemotherapy within the last 4 weeks before randomization
 •	Radiotherapy within the last 4 weeks before randomization
 •	Known hypersensitiveness to corticosteroids
 •	Systemic or local bacterial, viral, fungal - or yeast infection.
 •	Hepatic impairment (Child-Pugh score B-C)
 •	Portal hypertension (grade 1-4 CTC-NCI criteria)
 •	Ulcerative colitis, Crohn’s disease or celiac disease
 •	Simultaneous yellow fever vaccine
 
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| The incidence of cabazitaxel induced diarrhea |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| Daily during cycle 1 and 2 |  | 
| E.5.2 | Secondary end point(s) | 
| Incidence of other side effects of cabazitaxel |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| Daily during cycle 1 and 2 |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | Yes | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | Yes | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | Yes | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| E.8.1.5 | Parallel group | Yes | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | Yes | 
| E.8.2.3.1 | Comparator description | 
| no prophylactic treatment |  | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | The trial involves single site in the Member State concerned | No | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | Yes | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 40 | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 3 | 
| E.8.9.1 | In the Member State concerned months | 0 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 3 | 
| E.8.9.2 | In all countries concerned by the trial months | 0 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |