However , cell sources are limited , because they are produced in small numbers naturally and have a short lifespan .
Thence , immunotherapy with functional antigen - specific T cells has potential as a therapeutic strategy for combating many cancers and viral infections .
Cell sources are limited , because they are produced in small numbers naturally and have a short lifespan .
Thence , immunotherapy with functional antigen - specific T cells has potential as a therapeutic strategy for combating many cancers and viral infections .