CD79A and lymphopenia: Patients had a mean diagnosis age of 5.5 years, with consanguinity in 91.7% of cases and a family history of A-T in 58.3%. Common features included conjunctival telangiectasia (66.6%), lymphopenia (58.3%), low IgA (58.3%), IgG4 deficiency (66.7%), and impaired vaccine responses. No malignancies developed, and IVIG was started in 83.3% of patients. A-T mutations were found in 58.3%. Bone marrow transplantation was discussed as a potential option, though none of the patients received it during the study period.