Patients with newly diagnosed MM who are not candidates for ASCT and who are going to start drug treatment for the study disease and patient who is capable of understanding and filling in the study questionnaires At least 450 patients will be enrolled in a 2-year period. Patients must meet all of the inclusion criteria and none of the exclusion criteria and must have previously granted their informed consent in writing.

This questionnaire consists of 30 items grouped into 8 dimensions: number of drugs, gait velocity, mood, activities of daily living, health status, nutrition, mental state and comorbidity/habits. It is an instrument that was developed and validated to assess the health status of elderly patients diagnosed with different hematological diseases, including MM. This scale may be a useful instrument in clinical practice as a support tool to predict tolerance to treatment in advanced age. The time required to complete the questionnaire is approximately 10-12 minutes. It will be provided only at the baseline visit for the patient to fill in before starting treatment. The patient must fill it in again each time he or she starts a new line. The questionnaire will be provided by the physician during the visit.

This is a generic HRQoL questionnaire that contains a descriptive system and a visual analogue scale (VAS) for self-assessment of health status. The EQ-5D-5L's descriptive system contains a description of health state in five dimensions (mobility, self-care, usual activities, pain/discomfort and anxiety/depression). Each dimension has 5 possible responses. The respondent must mark the level of problems, within each dimension, that best describes his or her health state "today". It will be provided at each visit for the patient to fill in before starting treatment: at the baseline visit, approximately every 4 months in the first year (the visits must coincide with the patient's routine clinical practice visit) and after the first year every 6 months to progression. In case of progression and start of a second line of treatment, the questionnaire will start to be filled in with the same frequency initially described (baseline, every 4 months, etc.).

This is a cancer-specific questionnaire that consists of 30 items structured into 5 functional scales (physical functioning, role functioning, emotional functioning, cognitive functioning and social functioning), 3 symptom scales (fatigue, nausea and vomiting, pain), a global health status scale and, finally, 6 independent items (dyspnoea, insomnia, appetite loss, constipation, diarrhea and financial difficulties). Values from 1 to 4 are assigned depending on the patient's responses to the item. Only items 29 and 30 are evaluated with scoring from 1 to 7. Scores are standardised to obtain a score from 0 to 100, which determines the level of impact of the cancer on the patient for each scale. High scores on the overall health and functional status scales indicate a better QoL, while high scores on the symptoms scale would indicate a decrease in QoL since they indicate the presence of cancer-related symptoms.

Time that elapses from the start of a treatment up to disease progression.

Time that elapses from the start of a treatment to disease progression or death, whichever occurs first.