In addition, CD47 antibodies and CD47 antagonizing SIRPa-Fc fusion
proteins have been reported to cause รีรี and ภาวะโลหิตจาง when ให้ to mice และ / หรือ ไซโนมอลกัส monkeys. (See, Weiskopf et al. Engineered SIRPa Variants as Immunotherapeutic Adjuvants to Anticancer Antibodies. Science 2013; 341:88). ภาวะโลหิตจาง is a condition in which the blood lacks a sufficient amount of red blood cells or hemoglobin to carry oxygen to the tissues. ภาวะโลหิตจาง can be diagnosed by a number of methods generally known in the art. For example, ภาวะโลหิตจาง is diagnosed by determining the complete blood count (CBC), which determines the number, size, volume, and hemoglobin content of red blood cells. ภาวะโลหิตจาง is also diagnosed by measuring the blood iron level และ / หรือ serum
ferritin level, which are indicators of the body's total iron stores. In addition, ภาวะโลหิตจาง is
diagnosed by measuring the levels of vitamin B12 and folate, reticulocyte count, and
bilirubin.
[00691 Thus, the aggregation of cells, ดีดีของ RBC, and ภาวะโลหิตจาง represent major limitations of therapeutically targeting CD47 with existing full IgG antibodies และ / หรือ
SIRPa-Fc fusion proteins.