Introduction/Background Mirvetuximab soravtansine-gynx (MIRV), an antibody-drug conjugate targeting folate receptor-alpha (FRα), is the first novel treatment to demonstrate a benefit in overall survival in platinum-resistant ovarian cancer (PROC) in a phase 3 trial. MIRASOL is the confirmatory, randomized, global phase 3 trial of MIRV vs standard-of-care chemotherapy in patients with PROC. Here we report quality of life (QoL) findings from the MIRASOL trial, measured using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 instrument.

Methodology 453 patients with FRα positive PROC (Roche FOLR1–2.1 Assay) who received 1–3 prior lines of therapy were randomized 1:1 to MIRV 6 mg/kg, adjusted ideal body weight every 3 weeks or investigator’s choice chemotherapy (ICC) [paclitaxel, pegylated liposomal doxorubicin, or topotecan]. Global health status (GHS), physical functioning (PF), role functioning (RF), and fatigue symptom (FS) subscales were collected. Responder analyses at week 8/9 were analyzed using the Cochran-Mantel-Haenszel (CMH) to test for differences between the MIRV arm and the IC Chemo arm. Change from baseline was analyzed with mixed model repeated measures.

Results Across all subscales, a higher proportion of patients treated with MIRV vs ICC showed improvement at week 8/9 with statistically significant differences across arms in the GHS (22.9% vs 10.4%, p-value = 0.0023), RF (10.1% vs 3.9%, p-value=0.0386), and FS scales (14.3% vs 4.6%, p-value=0.0038). PF was (11.8% vs 5.8%, p-value= 0.0672). Change from baseline scores favored MIRV across all subscales, with statistically significant differences in all subscales at week 8/9, week 15/16, and week 24 (figure 1).

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Abstract 360 Figure 1

Change from baseline in EORTC QLQ-C30 subscales score with MIRV versus IC Chemotherapy during the MIRASOL trial. The EORTC QLQ-C30 is a 30-item questionnaire that assesses quality of life in patients with cancer by measuring functional domains, symptoms, and global health status/quality of life (generally focusing on the past week of their life). Higher functional and global health scale scores indicate a perceived better level of functioning. Higher symptom subscale scores represent a higher perceived level of symptom severity. (A) The global health status/quality of life score assesses overall physical condition and quality of life. (B) The physical functioning subscale determines how physically able a person is (eg, ability to perform more strenuous physical activities). (C) The role functioning subscale determines how well a person can do either a job or household chores. (D) The fatigue symptom measurement indicates how severe a person’s feelings of tiredness/weakness are. aDifference in LS mean (vs IC Chemotherapy). Abbreviations: CI, confidence interval; EORTC QLQ-C30, European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30; FS, fatigue symptoms; GHS/QoL, global health status/quality of life; IC, investigator’s choice; LS, least squares; MIRV, mirvetuximab soravtansine-gynx; PF, physical functioning; RF, role functioning; SE, standard error

Conclusion In the MIRASOL study, patients treated with MIRV maintained HRQoL while deterioration in HRQoL was observed in the ICC arm. The efficacy and safety of MIRV is supported by PRO data from the MIRASOL trial and position MIRV as a new standard of care for pts with FRα positive PROC.

Disclosures N/A.