A Study to Investigate Subcutaneous Isatuximab in Combination With Carfilzomib and Dexamethasone in Adult Participants With Relapsed and/or Refractory Multiple Myeloma

ORR defined as the proportion of participants with stringent complete response (sCR), complete response (CR), very good partial response (VGPR), and partial response (PR) according to the 2016 International Myeloma Working Group (IMWG) criteria assessed by Independent Review Committee (IRC).

Patient preference for method of administration defined as the proportion of participants preferring OBDS over manual administration of isatuximab SC at Day 15 of Cycle 6 using the patient experience and satisfaction questionnaire version 2 (PESQ v2).

Blood samples will be collected for measurement of isatuximab concentrations.

Proportion of participants with sCR, CR, VGPR, and PR according to the 2016 IMWG criteria assessed by investigator.

DOR defined as time from date of first IRC-determined response for participants achieving PR or better to first documentation of progressive disease (PD) determined by IRC or death, whichever occurred first, for Cohorts 1 to 3. For Cohorts 4-5, the time from date of first investigator determined response for participants achieving PR or better to first documentation of progressive disease (PD) determined by investigator or death, whichever occurred first.

TT1R defined as time from first investigational medicinal product (IMP) administration or randomization to first IRC determined response (PR or better) that is subsequently confirmed, for Cohorts 1 to 3. For cohorts 4-5, the time from first IMP administration or randomization to first investigator determined response (PR or better) that is subsequently confirmed.

TTBR defined as time from first IMP administration or randomization to first occurrence of IRC determined best response (PR or better) that is subsequently confirmed, for Cohorts 1 to 3. For cohorts 4-5, the time from first IMP administration or randomization to first occurrence of investigator determined best response (PR or better) that is subsequently confirmed.

PFS defined as time from the date of first IMP administration or randomization to the date of first documentation of PD as determined by IRC for Cohorts 1 to 3 and by Investigator for all cohorts, or the date of death from any cause, whichever comes first.

OS defined as time from the date of first IMP administration or randomization to death from any cause.

PEQ-BL v2 is a participant assessed questionnaire. It will be completed at baseline prior to study treatment administration or other study related procedures. This questionnaire has been designed to assess the expectations of the participants regarding both the treatment (side effects, worth taking) and the administration method (confidence, comfortability, pain, side effects, potential time-savings), as well as to understand previous treatment experience from the participant (experience with injection methods for oncology medication).

PESQ v2 is a participant assessed questionnaire. It has been designed to follow up on participant experience and satisfaction regarding the treatment (side effects, worth taking and overall satisfaction) and the administration method (confidence, comfortability, pain, side effects, potential time-savings and overall satisfaction). The PESQ v2 includes items to assess preference on subcutaneous injection method. This questionnaire has been developed using industry standard for instrument development and has been debriefed and adapted based on qualitative interviews with oncology patients. The more general treatment expectations instrument (v1) was further adapted and debriefed with patients to assess manual and OBDS subcutaneous delivery (v2). The PESQ v2 contains a total of 9 items. There are 6 items that are administered for the duration of treatment, and 3 preference items administered only after patient experience of both manual and OBDS.

Medical resource utilization and participant productivity will be collected from participants through a specific questionnaire developed by Sanofi for cohorts 1,2, 3, and 5. The data collected include number, nature (emergency or routine) and duration of hospitalizations, emergency room visits and outpatient medical encounters and employment history.

HRQL is assessed for cohorts 1, 2, and 3 using the European Organization for Research and Treatment of Cancer (EORTC) myeloma module with 20 items (QLQ-MY20) and EORTC quality of life questionnaire with 30 questions (QLQ-C30); a total of 50 items. The EORTC QLQ-C30 provides a comprehensive assessment of the principal HRQL dimensions identified as relevant by cancer patients. The EORTC QLQ-MY20 is to be used in conjunction with the EORTC QLQ-C30 to assess symptoms and side effects due to the treatment or the disease which impact HRQL in participants with MM.

Health status is assessed for cohorts 1, 2, and 3, using the EQ-5D-5L, a standardized measure of health status that provides a simple, generic measure of health utility, and consists of 2 sections: descriptive and VAS. The descriptive system consists of 5 dimensions: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. The VAS records the respondent's self-rated health on a 20 cm vertical VAS with endpoints labelled 'the best health you can imagine' and 'the worst health you can imagine'. This information can be used as a quantitative measure of health as judged by the individual respondents.