Abstract
The current study included 83 patients with Ca glandulae parotis (72 men and 11 women) whose blood group affiliation to the AB0 and Rhesus factor systems was monitored. A comparison was made with a control group of healthy individuals from the modern Bulgarian population. The distribution of the blood groups in the sample was different from that of the control group (p <0.001). There was a significant increase in the prevalence of persons with blood group B (p <0.001), and a significant decrease in groups 0 (p <0.001) and A (p <0.05). In group AB, a slight increase in frequency was detected. With respect to the Rhesus factor, there was an increase in the patients with positive Rhesus factor - by 9.23% to 93.94% (p<0.05). It can be assumed that, among other risk factors, belonging to group B and having a positive Rhesus factor are one of the reasons for the appearance and development of the disease.
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