In a participatory process involving urologists and former patients, the project team has developed an online information system ("tutorial") for patients with localized prostate cancer. In this field test, relevant outcomes are measured and the tutorial will be tested for its clinical applicability.

Prostate cancer is the most common cancer in men: In Switzerland, every year about 6,000 men are diagnosed with prostate cancer. Men with prostate cancer at an early stage are confronted with a difficult decision: they are faced with different treatment alternatives, each with its own advantages and disadvantages. That is why a comprehensive information delivery and processing is extremely important for patients to make an informed decision.

Therefore, an online platform has been developed in collaboration with urologists and former patients. This online platform is designed to cover the individual information needs of patients with early prostate cancer. Additionally, the software aims at facilitating cooperation between patients and doctors and at increasing the satisfaction of patients with their treatment decision.

In this study, the online platform will now to be tested in clinical practice, and data will be collected for the benefit of the platform: Can the online platform actually satisfy the indivudal information needs, facilitate the therapy decision and support the cooperation between doctors and patients?

Medical Inclusion Criteria:

• tumor stage: clinical stage T1 or T2
• PSA level <20 (PSA = Prostata-specific antigen)
• Gleason score <8
• age ≤ 75 years
• Assumed life expectancy ≥ 10 years

Other inclusion criteria due to the study design and the type of intervention are the following:

• patients have to be diagnosed in one of the trial sites
• Internet-enabled device in the patient's household / basal user knowledge of this device
• signing of the consent form

Exclusion Criteria:

• Impaired judgment
• Insufficient ability to read and understand German
• Emotional problems