It is a copyrighted instrument, which has been translated and validated in over 100 languages and is used in more than 3,000 studies worldwide. Presently QLQ-C30 Version 3.0 is the most recent version and should be used for all new studies.
It is supplemented by disease-specific modules for e.g. Breast, Lung, Head & Neck, Oesophageal, Ovarian, Gastric, Cervical cancer, Multiple Myeloma, Oesophago-Gastric, Prostate, Colorectal Liver Metastases, Colorectal and Brain cancer which are distributed by the EORTC Quality of Life Department. Other disease specific modules are under development but not yet validated.
They have also developed a Satisfaction with Care measure (EORTC-IN-PATSAT32) and a Palliative Care questionnaire (QLQ-C15-PAL). These are also general questionnaires.
Conditions for the use of questionnaires are dependent on whether they will be employed in an academic or commercial setting. For academic settings, there is no charge, but a User Agreement is required for each study