Evaluation of Immune Status Before and After Splenectomy in Immune Thrombocytopenia Patients
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: splenectomy.
- Who it may be relevant to
- Registry conditions: Thrombocytopenia, Splenectomy. Basic parameters: 18 years — 60 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- China
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Overview
Evaluation of immune status before and after splenectomy in immune thrombocytopenia patients.
Detailed description
A total of 30 ITP patients will be enrolled in the study. These patients should fail to have sustained response to multiple first- and second-line treatments of ITP and agree to have splenectomy. Before splenectomy, these patients will be reassessed and still diagnosed with ITP.Their platelet level will be raised to a safe state before surgery, and the laparoscopic splenectomy will be performed in Tianjin People's Hospital. The investigators plan to take 20ml of peripheral blood (PB) of these patients at 6 time points, including 1 day before surgery, 1 week, 1 month, 3 months, 6 months, and 12 months after surgery, and take a small amount of spleen tissue during surgery.
18 age- and gender- matched healthy donor will also be enrolled as controls and taken 20ml of peripheral blood. The investigators also plan to take splenic tissue from 10 patients who have splenectomy due to Hereditary spherocytosis or trauma.
And then the investigators will do the experiments step by step. 1, Isolation of peripheral blood and splenic mononuclear cells;2, Detection of the percentage of cell population;3, Activation and proliferation of B lymphocyte; 4, Activation and proliferation of T lymphocyte;5,Apoptosis of platelets by cytotoxic T cells;6,Phagocytosis of platelets by macrophages in spleen;7,Enzyme-linked immunosorbent assay (ELISA) for cytokines.
Interventions
- Procedure splenectomy
These patients should fail to have sustained response to multiple first- and second-line treatments of ITP and agree to have splenectomy.Before splenectomy, these patients will be reassessed and still diagnosed with ITP.Their platelet level will be raised to a safe state before surgery, and the laparoscopic splenectomy will be performed in Tianjin People's Hospital.
Primary outcome measures
- Changes of the percentage of cell population [Time frame: 1 year]
- Changes of activation and proliferation of B and T lymphocyte, apoptosis of platelets by cytotoxic T cells(CTLs) [Time frame: 1 year]
- Changes of cytokines in the cell culture supernatants and plasma [Time frame: 1 year]
Secondary outcome measures (2)
- Changes of phagocytosis of platelets by macrophages in itp patients spleen and the normal spleen controls. [Time frame: The day of the splenectomy]
- Changes of the percentage of cell population, activation and proliferation of B and T lymphocyte, apoptosis of platelets by cytotoxic T cells(CTLs) in itp patients spleen and the normal spleen controls. [Time frame: The day of the splenectomy]
Eligibility criteria
Inclusion criteria
- Aged 18 to 60 years old, male or female;
- Conform to the diagnostic criteria of immune Thrombocytopenia (ITP)
- Needed splenectomy;
- People who are willing to sign the informed consent voluntarily and follow the research program.
Exclusion criteria
- Secondary thrombocytopenic purpura;
- Patients with poor compliance;
- Researchers believe that patients should not participate in the test of any other condition.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Case-control
Study locations
China · 1 center
- Yunfei Chen — Tianjin
Publications
- Olsson B, Ridell B, Jernas M, Wadenvik H. Increased number of B-cells in the red pulp of the spleen in ITP. Ann Hematol. 2012 Feb;91(2):271-7. doi: 10.1007/s00277-011-1292-2. Epub 2011 Jul 23. PMID 21785982
- Kuwana M, Okazaki Y, Kaburaki J, Kawakami Y, Ikeda Y. Spleen is a primary site for activation of platelet-reactive T and B cells in patients with immune thrombocytopenic purpura. J Immunol. 2002 Apr 1;168(7):3675-82. doi: 10.4049/jimmunol.168.7.3675. PMID 11907134
- Zhang F, Chu X, Wang L, Zhu Y, Li L, Ma D, Peng J, Hou M. Cell-mediated lysis of autologous platelets in chronic idiopathic thrombocytopenic purpura. Eur J Haematol. 2006 May;76(5):427-31. doi: 10.1111/j.1600-0609.2005.00622.x. Epub 2006 Feb 15. PMID 16480433
- Liu B, Zhao H, Poon MC, Han Z, Gu D, Xu M, Jia H, Yang R, Han ZC. Abnormality of CD4(+)CD25(+) regulatory T cells in idiopathic thrombocytopenic purpura. Eur J Haematol. 2007 Feb;78(2):139-43. doi: 10.1111/j.1600-0609.2006.00780.x. PMID 17328716
- Ling Y, Cao X, Yu Z, Ruan C. Circulating dendritic cells subsets and CD4+Foxp3+ regulatory T cells in adult patients with chronic ITP before and after treatment with high-dose dexamethasome. Eur J Haematol. 2007 Oct;79(4):310-6. doi: 10.1111/j.1600-0609.2007.00917.x. Epub 2007 Aug 10. PMID 17692100
- Olsson B, Ridell B, Carlsson L, Jacobsson S, Wadenvik H. Recruitment of T cells into bone marrow of ITP patients possibly due to elevated expression of VLA-4 and CX3CR1. Blood. 2008 Aug 15;112(4):1078-84. doi: 10.1182/blood-2008-02-139402. Epub 2008 Jun 2. PMID 18519809
- McMillan R, Wang L, Tani P. Prospective evaluation of the immunobead assay for the diagnosis of adult chronic immune thrombocytopenic purpura (ITP). J Thromb Haemost. 2003 Mar;1(3):485-91. doi: 10.1046/j.1538-7836.2003.00091.x. PMID 12871454
- Yu J, Heck S, Patel V, Levan J, Yu Y, Bussel JB, Yazdanbakhsh K. Defective circulating CD25 regulatory T cells in patients with chronic immune thrombocytopenic purpura. Blood. 2008 Aug 15;112(4):1325-8. doi: 10.1182/blood-2008-01-135335. Epub 2008 Apr 17. PMID 18420827
Identifiers
NCT: NCT03998059 · KT2018087