The proposed cohort study collected within a 5-month observation period adverse drug reaction (Adverse Drug Events - ADE) in patients at the Department of Oncology at the University of Zurich. ADE have been recorded using prospective monitoring and assessed using standardized algorithms regarding causality and severity. Data sources included information from the medical records, laboratory values and internal rounds. Additional information has been collected using a standardized patient questionnaire.

The primary endpoints of this study are to determine the frequency of ADE, the comparison of the quality of data sources and collection methods for the detection of ADE in regard to patient characteristics, size, number of medications, the category of ADE, severity, causation, diagnosis, hospitalization, cause of hospitalization and medication cause. Secondary endpoint is the assessment of the ADE causality, severity and predictability.

Inclusion criteria:

• German-speaking patients,
• At least 18 years old.

Exclusion criteria:

• Patients who could not give her consent, or have given, and any minor patient.

All patients hospitalized at the oncology ward G and H of the university hospital zurich during the 5-month observation period