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Anti-CD25 monoclonal antibody (90Y-daclizumab) a favorable target towards systemic radio-immunotherapy in Hodgkin's Lymphoma

6th October 2015 – The IL-2 receptor α subunit, CD25 is commonly expressed in T-regulatory (Treg) cells and a small subset of Reed-Sternberg cells in Hodgkin's Lymphoma (HL). Normal resting cells do not express CD25. An article published by Janik et. al 2015 (PNAS) stated that the predominant motivation to engage anti-CD25 in HL radioimmunotherapy is the expression of CD25 on T cells rosetting around Reed-Sternberg cells. Thereby, non-CD25 expressing tumor cells can also be killed during the crossfire of the battlefield when a high radiation dose is delivered.

90Y has a high β-energy emission, with a mean path length of 5mm and a maximum of 11mm. In Janik's study, the two clinical studies of relapsed-HL consecutive patients who were studied between April 2003 and October 2007 (n=30); between November 2009 and June 2014 (n=16) used daclizumab, a humanized anti-Tac, i.e. anti-CD25. The recruited patients received 90Y-daclizumba every 6-10 week and with a maximum cap of seven doses.

The clinical study presented encouraging results of 90Y-daclizumab radioimmunotherapy in relapsed HL patients: 30.4% complete responses and 19.6% partial responses. The patients' follow-up responses showed minor toxicity - thrombocytopenia and granulocytopenia.

However, six of the 30 patients in the first study presented myelodysplastic syndrome (MDS). Though MDS is a concern in oncology studies, the study is unable to draw supportive conclusions on whether 90Y-daclizumab may trigger MDS among HL patients with different medical histories and whom have received different combinations of onco-therapies.

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John E. Janik, et al. 90Y-daclizumab, an anti-CD25 monoclonal antibody, provided responses in 50% of patients with relapsed Hodgkin's lymphoma https://www.pnas.org/cgi/doi/10.1073/pnas.1516107112

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APBN Editorial Calendar 2019
January:
Taiwan Medical tourism
February:
Marijuana as medicine — Legal marijuana will open up scientific research
March:
Driven by curiosity
April:
Career developments for researchers
May:
What's cracking — Antibodies in ostrich eggs
June:
Clinical trials — What's in a name?
July:
Traditional Chinese medicine in modern healthcare — Integrating both worlds
August:
Digitalization vs Digitization — Exploring Emerging Trends in Healthcare
September:
Healthy Ageing — How Science is chipping in
Editorial calendar is subjected to changes.
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