HPA Antibodies and the Distribution of Antigen and Antibodies

By detecting platelet antibodies of participants and then further to identify their genotype and analyzing laboratory examination, the investigators will obtain positive frequency of HPA antibodies, the distribution of HPA antigen and antibodies, effect of matching platelet transfusion, all of which in favor of draw a conclusion that it is very important to carry out HPA antibody detection and matching transfusion in early phase.

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Key information

Conditions

Blood Disease Antibody-mediated Rejection Hematologic Diseases Hemic and Lymphatic Diseases Platelet Refractoriness

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Guangzhou First People's Hospital

Guangzhou, Guangdong, 210000, China

About this study

The investigators will detect platelet antibodies of participants who are according with the inclusive criteria.
For participants with platelet antibodies, the investigators should screen out cases owning HPA antibodies and further to identify their genotype.
Platelet infusion of same type will be applied to half of participants with HPA antibodies as experimental group, and the another half of participants with hematopathy will be infused ordinary platelets as control. The investigators will estimate the effect of matching transfusion through laboratory examination such as platelet count 1 hour and 24 hours after transfusion and clinical feature comparing to control group.
Finally, the investigators will obtain several conclusions includes positive frequency of HPA antibodies, the distribution of HPA antigen and antibodies, effect of matching platelet transfusion by analyzing a bunch of relevant information. So, strong evidence will be provide to decide if it is very important to carry out HPA antibody detection and matching transfusion in early phase.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Blood disease patients with voluntary participation in creating records, no gender limitation, 0-99 years of age, first diagnosed or be hospitalized in our hospital with platelet transfusion more than once.
Patients transfers from other hospitals which can be confirm the time (>1) of platelet transfusion.
Patient be cured, discharged or dead with the time of platelet transfusion is between 1 to 10 should be included.
Patient with HPA antibodies at admission could be considered to be included into same type transfusion group.

Exclusion criteria

Patients informed but refuse to participate in;
Patients with HPA antibodies quitting therapy or breaking off cooperation during research;
Patients with many referrals and the time of platelet transfusion can not be confirmed;
Patient without platelet transfusion;
Patient with termination of treatment whatever active or passive. -

Treatment and study plan

same type infusion of main HPA antigen

Procedure

Compare the differences of platelet count between participants with same type infusion of main HPA antigen and not

Primary outcomes

The percentages (%) of hematopoietic patients with anti-HPA antibodies among all investigated hematopoietic patients who need long-term infusion of platelets.

Time frame: From one participant first enrolled in this study to the moment of HPA antibodies could be detected or death, up to 6 months. The investigators will calculate the percentages after all participants are done with trace.

The investigators will recruit about 25000 participants in total (anticipated) of different hospitals spread over the whole country and divide them into two categories, patients with and patients without platelet antibodies, by detecting antibodies through solid-phase agglutination (qualitative analysis). The investigators screen out the positive ones and then distinguish participants with antibodies against human platelet antigens (HPA) from those with antibodies against human leukocyte antigens (HLA) by using LIFECODES PAKPLUS (qualitative analysis). At the same time, subtype of anti-HPA antibodies (such as anti-HPA-1a antibodies) are detected. The analyzation of large sample data will present investigators the most important findings, the percentages (%, the primary outcome measure) of hematopoietic patients with anti-HPA antibodies (include the total and the various subtypes) among all investigated hematopoietic patients who need long-term infusion of platelets.

Sponsors and collaborators

Lead sponsor

Guangzhou First People's Hospital

Other

Collaborators

First Affiliated Hospital Xi'an Jiaotong University
First Affiliated Hospital of Harbin Medical University
Hunan Provincial People's Hospital
LanZhou University
Nanfang Hospital, Southern Medical University
Sun Yat-sen University
The Fourth Affiliated Hospital of China Medical University
The Third Affiliated Hospital of Guangzhou Medical University

Registry information

Official study title

Multi-center Study in the Frequency of HPA Antibodies and the Distribution of Antigen and Antibodies in Chinese Blood Disease Patients

Important dates

Study start: 2017
Primary completion: 2020
Study completion: 2020
First posted: Jan 23, 2018
Registry last updated: Aug 12, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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Completed