Methods of treating initial episode of TTP with immunoglobulin single variable domains
The present invention is based on the finding that administration of polypeptides comprising two immunoglobulin single variable domains (ISVD) against von Willebrand Factor (vWF) to human patients with an initial episode of thrombotic thrombocytopenic purpura (TTP) episode results in improved outcomes, including a faster time to platelet count response lower proportion of patients with either death, recurrence or a major thromboembolic event (TE) during the treatment period, lower recurrence rate, and prevention of refractoriness. The invention provides a polypeptide comprising two ISVD against vWF for use in treating a vWF-related disease, preferably TTP, in a human in need thereof. The invention further relates to dosage unit forms, kits and medical uses for treating TTP.
1. A method of treating an initial episode of a von Willebrand Factor (vWF)-related disease comprising administering to a human experiencing an initial episode of the vWF-related disease a polypeptide comprising two anti-human vWF immunoglobulin single variable domains (ISVDs),
wherein the human is 2-18 years old and has a body weight of <40 kg,
wherein the polypeptide is administered in a dose of 5 mg,
wherein each of the anti-human vWF ISVDs consists of 4 framework regions (FR1 to FR4, respectively) and 3 complementarity determining regions (CDR1 to CDR3, respectively), and
wherein at least one of the anti-human vWF ISVDs is represented by SEQ ID NO: 19.
2. The method according to claim 1 , wherein said step of administering the polypeptide is repeated for at least 1 day.
3. The method according to claim 2 , wherein said treatment results in a faster time to platelet count response, lower proportion of patients with either death, recurrence or a major thromboembolic event (TE) event during the treatment period, lower recurrence rate, and/or prevention of refractoriness.
4. The method according to claim 1 , wherein said polypeptide comprises at least one ISVD binding SEQ ID NO: 20.
5. The method according to claim 1 , wherein each of the anti-human vWF ISVDs comprises:
a) a CDR1 comprising or consisting essentially of the amino acid sequence YNPMG (SEQ ID NO: 21);
b) a CDR2 comprising or consisting essentially of the amino acid sequence AISRTGGSTYYPDSVEG (SEQ ID NO: 22); and
c) a CDR3 comprising or consisting essentially of the amino acid sequence AGVRAEDGRVRTLPSEYTF (SEQ ID NO: 23).
6. The method according to claim 1 , wherein said polypeptide is at least 90% identical to SEQ ID NO: 1.
7. The method according to claim 1 , wherein said polypeptide is ALX 0081 (SEQ ID NO: 1) or ALX 0081-A (SEQ ID NO: 24).
8. The method according to claim 1 , wherein said dose is administered 1 time per day or two times per day.
9. The method according to claim 1 , comprising repeating administering said polypeptide until the platelet number in said human is at least 150,000/μl.
10. The method according to claim 9 , comprising repeating administering said polypeptide until the platelet number in said human is at least 150,000/μl on at least 2 consecutive measurements.
11. The method according to claim 10 , wherein said step of administering the polypeptide is repeated for at least 1 day after said platelet number is at least 150,000/μl on at least 2 consecutive measurements.
12. The method according to claim 10 , wherein said 2 consecutive measurements are at least 24 h apart.
13. The method according to claim 1 , comprising repeating administering said polypeptide until the ADAMTS13 activity in said human is at least 10% of an ADAMTS13 reference activity.
14. The method according to claim 1 , comprising repeating administering said polypeptide until the level of an organ damage marker in said human returns to at least 40% of normal levels.
15. The method according to claim 1 , comprising performing a Plasma Exchange.
16. The method according to claim 1 , wherein said vWF-related disease is acute coronary syndrome (ACS), transient cerebral ischemic attack, unstable or stable angina pectoris, stroke, myocardial infarction or thrombotic thrombocytopenic purpura (TTP).
17. The method according to claim 1 , comprising using a kit or an article of manufacture, comprising a container containing the polypeptide, and instructions for use.
18. The method of claim 1 , further comprising performing a Plasma Exchange within 5 hours following administration of the polypeptide.
19. The method according to claim 14 , wherein the organ damage marker is LDH level, troponin T level, troponin I level, and/or creatinine level.
20. The method according to claim 1 , wherein said vWF-related disease is thrombotic thrombocytopenic purpura (TTP).