The ABO blood group was discovered in 1900 by Austrian scientist, Karl Landsteiner. At present, the International Society of Blood Transfusion (ISBT) approves as 29 human blood group systems. The ABO blood group system consists of four antigens (A, B, O and AB). These antigens are known as oligosaccharide antigens, and widely expressed on the membranes of red cell and tissue cells as well as, i...

The ABO blood group distribution varies in different geographical and ethnic groups. In Punjab (India), the ABO blood frequency is B>O>A>AB. The current study was an attempt to correlate the ABO blood group frequency with preponderance of breast and gastrointestinal cancer in Punjab, to assess the utility of ABO blood group as a preclinical marker. The study sample consists of 160 cancer patien...

Background: The ABO blood group system was the first human blood group system to be discovered by Landsteiner in 1900. The second type of blood group is the rhesus system. There are only two Rh phenotype such as Rh positive and Rh negative, depending on whether Rh antigen is present on the red cell or not. The frequency of ABO and Rh phenotypes in different populations has been extensively stud...