Aged 1 Anemia, Hemolytic, Autoimmune 1 Article 1 Autoantibodies 1 Blood Transfusion 1 Coombs Test 1 Coombs test 1 Cryoglobulins Erythrocytes 1 Female 1 Humans 1 Male 1 Middle Aged 1 Rectal Neoplasms 1 adult 1 aged 1 antibody screening 1 antibody titer 1 autoantibody 1 autoimmune hemolytic anemia 1 blood 1 blood group 1 blood transfusion 1 blood transfusion decision 1 bone marrow suppression 1 cancer chemotherapy 1 case report 1 clinical article 1 cold agglutinin 1 cold agglutinins 1