A Study to Evaluate the Safety of GSK2398852 When Co-administered With GSK2315698 in Patients With Systemic Amyloidosis

Summary

The study will be conducted in two parts. The first (Part A) will be an open label single dose escalation part beginning with the proposed starting dose level of GSK2398852 as 5 milligram (mg) \[approximately equivalent to 0.1 mg/kilogram (kg)\]. The next escalation dose levels are proposed as 1 mg/kg, 3 mg/kg, 10 mg/kg and 30 mg/kg. GSK2315698 will be administered at variable doses until the concentration of the serum amyloid P component monoclonal antibody (SAP mAb) has fallen below 100 nanogram/millilitre (ng/mL). Decisions about these next dose levels will be made following safety review of the prior subjects' data; dose levels may be changed (increased and lowered) and dose levels may be repeated depending on the observed safety such that Part A extension study may be performed. In addition, pharmacokinetics of GSK2315698 (SAP depleter) and GSK2398852 (anti-SAP mAb), and circulating SAP concentrations will be assessed. Dose escalation in Part A will continue to the highest well tolerated dose or the highest allowable dose. Subjects will be closely monitored and will undergo Equilibrium contrast Magnetic Resonance Imaging (EqMRI) including organ volume, Elastography and Liver Biopsy if required. Part B will be a randomized partially blinded part with the principal objective of assessing the dose response of the GSK2398852 in more detail. Subjects will be assigned to one of approximately 5 dose groups from Part A. The precise selection of numbers of subjects and dose levels will be informed by the results from Part A.

Timeline

Start

2013-05-13

Primary completion

2015-12-22

Completion

2015-12-22

Publications

• Richards D, Millns H, Cookson L, Lukas MA. An observational, non-interventional study for the follow-up of patients with amyloidosis who received miridesap followed by dezamizumab in a phase 1 study. Orphanet J Rare Dis. 2022 Jul 9;17(1):259. doi: 10.1186/s13023-022-02405-7.
• Richards DB, Cookson LM, Barton SV, Liefaard L, Lane T, Hutt DF, Ritter JM, Fontana M, Moon JC, Gillmore JD, Wechalekar A, Hawkins PN, Pepys MB. Repeat doses of antibody to serum amyloid P component clear amyloid deposits in patients with systemic amyloidosis. Sci Transl Med. 2018 Jan 3;10(422):eaan3128. doi: 10.1126/scitranslmed.aan3128.
• Richards DB, Cookson LM, Berges AC, Barton SV, Lane T, Ritter JM, Fontana M, Moon JC, Pinzani M, Gillmore JD, Hawkins PN, Pepys MB. Therapeutic Clearance of Amyloid by Antibodies to Serum Amyloid P Component. N Engl J Med. 2015 Sep 17;373(12):1106-14. doi: 10.1056/NEJMoa1504942. Epub 2015 Jul 15.

Drugs

Indications