This is a prospective, multicentre, phase III, randomised, controlled intervention study.

Two groups of patients with equal numbers will be studied and each patient will be allocated to one of the two groups described below by randomisation (ratio 1:1).

Each patient will be allocated to one of the two groups described below by randomisation (ratio 1:1).

- PASCA interventional group

For both the 7 complications of interest (primary objective) and the 13 secondary complications (secondary objective), a specific and proactive referral will be made systematically after each screening assessment, depending on the level of risk, estimated according to decision trees (management guide) and through the dedicated PASCA network of healthcare professionals, in order to initiate early treatment and follow-up if necessary.

- Control group

For the 7 complications of interest (primary objective) as well as for the 13 complications (secondary objective): all the data from each identification check-up will be sent to the onco-haematological transmitted to the referring onco-haematologists, so that they can initiate their own management.

=> For all patients, regardless of group

All patients will receive four screening assessments covering the 7 complications of interest and 13 secondary complications:

• Visit No.1 (T1), 1-2 months after the autologous haematopoietic stem cell transplantation (aHSCT), corresponding to the patient's visit to his or her Multiple Myeloma (MM) monitoring consultation and/or the start of his or her consolidation treatment.
• Visit No.2 (T2), 4 months after aHSCT, corresponding to a patient's visit for the end of consolidation treatment;
• Visit No.3 (T3), 14 months after the last aHSCT, corresponding to a visit by the patient during his or her maintenance treatment;
• Visit No.4 (T4), 24 months after the last aHSCT, corresponding to a visit by the patient for a MM monitoring consultation.

After each screening visit, all patients randomised to the intervention group will receive the PASCA intervention:

1. An interpretation of the results of the screening tests concerning

   • the 7 complications of interest assessed at T1, T2, T3 and T4 ;
   • the 13 secondary complications assessed at T1, T3 and T4. This interpretation will be based on decision trees (1 tree/complication) to guide investigators in their decision-making and to standardise orientations;

2. Explanation of results and referrals to the patient using plain language, by a phone call, ;

3. Early, proactive care via a dedicated network of healthcare professionals.

Inclusion Criteria:

1. Age ≥ 18 years old and ≤ 70 years old.
2. Patient treated in an investigation center.
3. Symptomatic multiple myeloma eligible for autologous hematopoietic stem cell transplantation (HSCT).
4. In complete response, complete response, very good complete response, or partial before HSCT.
5. First induction-type treatment (Isa-KRD/dara-VRD/dara-VTD/VRD/VTD/dara-VRD), intensification therapy with melphalan, HSCT, consolidation, maintenance including at least one drug immunomodulator.
6. ECOG performance status WHO ≤ 2.
7. No history or coexistence of other primary cancer apart from basal cell cancer cutaneous
8. Able to understand, read and write French.
9. Having signed and dated the informed consent.

Exclusion Criteria:

1. Unable to be monitored for medical, social, family, geographical or psychological, throughout the duration of the study.
2. Deprived of liberty by court or administrative decision.
3. Not affiliated with a health insurance plan.
4. Not having declared an attending physician.
5. Not domiciled in the Auvergne-Rhône-Alpes region or in the Saône-et-Loire department.
6. Not available and/or not willing to participate in the project for the entire duration of the study.
7. Pregnant women, breastfeeding women, people in emergency situations, people incapable of personally giving their consent including adults under guardianship