A cell therapy method for the treatment of tumors

A - Human Necessities – 61 – K

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A61K 35/14 (2006.01) C12N 5/0783 (2010.01) A61K 38/08 (2006.01) A61K 38/10 (2006.01) A61K 38/20 (2006.01) A61K 38/21 (2006.01) A61K 39/00 (2006.01) A61K 39/12 (2006.01) A61K 39/295 (2006.01) A61P 35/00 (2006.01) A61K 35/12 (2006.01) A61K 41/00 (2006.01)

Patent

CA 2448481

T cell responses are often diminished in humans with a compromised immune system. We have developed a method to isolate, stimulate and expand naive cytotoxic T lymphocyte precursors (CTLp) to antigen-specific effectors, capable of lysing tumor cells in vivo. This ex vivo protocol produces fully functional effectors. Artificial antigen presenting cells (AAPCs; Drosophila metanogaster) transfected with human HLA lass I and defined accessory molecules, are used to stimulate CD8+ T cells from both normal donors and cancer patients. The class I molecules expressed to a high density on the surface of the Drosophila cells are empty, allowing for,efficient loading of multiple peptides that results in ,the generation of polyclonal responses recognizing tumor cells endogenously expressing the specific peptides. The responses generated are robust, antigen-specific and reproducible if the peptide epitope is a defined immunogen. This artificial antigen expression system can be adapted to treat most cancers in a significant majority of the population.

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