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What is A male patient 59 year old complains of multiple swellings in the neck , fever, and weight loss. General examination reveals painless lymph node enlargement in the neck and on blood investigation anaemia is revealed. Serum albumin is 32 gm/l. Lymph node biopsy shows  Reed Sternberg cells.
The 5-year rate of overall survival (%) for this patient , according to The Hasenclever prognostic index for advanced Hodgkin lymphoma is: and explain in detail?
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