Additionally, one case of α-thalassemia with the genotype ααCS/ααIVS-II-55 was found to co-occur with δ-thalassemia mutations (CD65 A > T and CD115 C > T), exhibiting an even lower HbA2 level of 0.7% and no evidence of clinical anemia. This evidence concerns the gene CSF1R and thalassemia.