Multiple myelomas (immune system tumors), thymomas (thymus gland tumors), osteosarcomas (bone tumors), and fibrosarcomas also have the potential to raise the blood calcium level of pets. (2ndchance.info)
There are three major components that influence our immune system: the goji berry polysaccharides (protect cells from genetic mutation), beta - carotene (enhances thymus gland function) and germanium (induces the production of immune enhancing interferon). (projectwellnessnow.com)
Thymus gland atrophy (shrinkage) can have the same effect. (2ndchance.info)