Opdualag is a first-in-class, fixed-dose dual immunotherapy combination of relatlimab and nivolumab approved for the treatment of patients with unresectable or metastatic melanoma.

Developed by Bristol-Myers Squibb (BMS), Opdualag is available in a single-dose vial as a clear to opalescent, colourless to slightly yellow injectable solution containing 240mg nivolumab and 80mg relatlimab per 20mL (12mg and 4mg per mL).

Regulatory approvals for Opdualag

In September 2021, BMS was awarded priority review status by the US Food and Drug Administration (FDA) for the biologics license application (BLA) of the fixed-dose combination of relatlimab and nivolumab (Opdivo).

In March 2022, Opdualag was approved by the FDA for the treatment of adult and paediatric patients aged 12 years and above and weighing at least 40kg with unresectable or metastatic melanoma.

Metastatic melanoma causes and symptoms

Melanoma is a type of skin cancer that occurs when pigment-producing cells, called melanocytes, become cancerous. Metastatic melanoma occurs when the cancer spreads to other sites of the body. It is estimated that about 7,650 deaths from melanoma will occur in the US in 2022. The survival rate of the disease decreases with detection at later stages.

Signs and symptoms of metastatic melanoma may include fatigue, weight loss, swollen or painful lymph nodes, loss of appetite, trouble breathing or coughing, bone pain, headaches, seizures, and swelling of the liver.

Major risk factors for melanoma include frequent exposure to sun or ultraviolet (UV) radiation, family history of melanoma, and certain genetic mutations. Exposure to environmental factors, such as radiation or vinyl chloride, multiple blistering sunburns, having large numbers of moles, especially atypical moles, and having light skin, are some other risk factors.

Opdualag’s mechanism of action

Nivolumab and relatlimab are human immunoglobulin G4 (IgG4) monoclonal antibodies and their combination has shown to increase T-cell activation in comparison to monotherapy treatment.

Relatlimab is a lymphocyte activation gene-3 (LAG-3) blocking antibody that binds to the LAG-3 receptor and reduces the inhibition of immune response that occurs through the LAG-3 pathway.

Nivolumab is a programmed death receptor-1 (PD-1) blocking antibody that binds to the PD-1 receptor and blocks its interaction with the PD-L1 and PD-L2 ligands. It reduces the inhibition of immune response and generates an anti-tumour response.

LAG-3 and PD-1 are distinct immune checkpoint pathways that may potentially act synergistically to produce anti-tumour immune activity, thereby inhibiting tumour growth and promoting tumour regression.

Clinical trials on Opdualag

The approval of Opdualag was based on data from the randomised, double-blind Phase II/III RELATIVITY-047 study, which evaluated the efficacy and safety of the drug in 714 patients with previously untreated metastatic or unresectable Stage III or IV melanoma.

Patients were randomised to receive Opdualag (nivolumab 480mg and relatlimab 160mg) or nivolumab 480mg every four weeks until disease progression or unacceptable toxicity. The primary endpoint was progression-free survival (PFS) as assessed by Blinded Independent Central Review (BICR) using Response Evaluation Criteria in Solid Tumors (RECIST v1.1).

The results of the study showed that a statistically significant improvement in PFS was achieved in the Opdualag arm compared with the nivolumab arm. The median PFS was 10.1 months in the Opdualag arm and 4.6 months in the nivolumab arm. The final analysis of overall survival (OS), the secondary endpoint, was not statistically significant as the median OS was not reached (NR) in the Opdualag arm against 34.1 months in the nivolumab arm.

The most common adverse reactions reported in the Opdualag arm were musculoskeletal pain, fatigue, rash, pruritus and diarrhoea.

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