The association between the phenotypic expression profile of CD5 and the lambda and kappa light chains in MALT with either an aggressive or recurrent character remains unclear, and the CD5 phenotype can be expressed in indolent form [35], as in our patient who had a monoclonal gammopathy for more than 13 years without any lesions or suspicious radiological images. The gene discussed is CD5; the disease is monoclonal gammopathy.