Study for the Reliability and Validity of the EORTC PATSAT-C33 and the EORTC OUT-PATSAT7 Questionnaires

Inclusion Criteria: Patients regardless of cancer site or stage of disease (i.e. local, loco-regional, metastatic, in remission) will be invited to participate if they meet the following criteria: 1. Diagnosis of cancer confirmed histologically. 2. Patients are 18 years or older (to be adapted for compliance with each country regulation). 3. Patients are willing to express their non-opposition to participate in the study. 4. Patients are able to read and understand the language of questionnaires. 5. Patients have the cognitive ability to complete the questionnaires. 6. Patients have had a sufficient experience of the cancer treatment setting : a. For outpatients consulting in a chemotherapy day clinic/consultation for oral treatment, ambulatory radiotherapy or consultation for follow-up surveillance to check for signs of recurrence : i) between 3 to 6 cycles of chemotherapy or at least 2 cycles of other cancer treatment (e.g., biological oral therapy) or ii) between 2 to 6 weeks of radiotherapy or iii) within the 3rd to 24th month post-cancer treatment. b. For inpatients consulting on an oncology or a surgery ward at least 3 days of hospital stay Exclusion Criteria: Patients will be excluded if they are : 1. Participating in another patient-reported outcome investigation that may interfere with this study. 2. Experiencing any psychiatric condition or major cognitive impairment that may hamper completion of self-reported questionnaires.