CD79A and metastatic neoplasm: Jankovic et al., in a study of the effects of cytostatic drugs such as anthracycline and 5-FU in 40 patients with different metastatic tumors, recorded lower IgA levels and higher IgG concentrations in unstimulated saliva versus the control group, with an IgG/IgA ratio of 1.53 in patients with mucositis, while the healthy subjects presented values of under 1.0 (10).