Natural killer cells and methods for enhancing viability, proliferation and cytotoxicity of same following cryopreservation

1. A feeder free method of increasing viability, proliferation and cytotoxicity of isolated natural killer (NK) cells following cryopreservation comprising:

a. Isolating peripheral blood mononuclear cells (PBMCs) from blood;

b. Expanding NK cells from said PBMCs in a feeder free system;

c. Cryopreserving said expanded NK cells;

d. Thawing said cryopreserved NK cells;

e. Culturing said thawed NK cells in a feeder free system;

f. Adding a supplement to said feeder free system comprising a CpG oligodeoxyribonucleotide (ODN) identical to SEQ ID NO: 1 immediately after thawing.

2. The method of claim 1 further comprising adding IL-12 at a concentration of 1 ug/ml to said feeder free system immediately after thawing.

3. The method of claim 1 further consisting of adding cytokines to said feeder free system immediately after thawing.

4. The method of claim 2 further comprising adding CpG ODN identical to SEQ ID NO: 1 at a concentration of 3 ug/ml to 24 ug/ml.

5. A feeder free method of increasing viability, proliferation and cytotoxicity of isolated NK cells following cryopreservation comprising:

a. Expanding NK cells from PBMCs in a feeder free system;

b. Cryopreserving said expanded NK cells;

c. Thawing said cryopreserved NK cells;

d. Culturing said thawed NK cells in a feeder free system;

e. Adding a supplement to said feeder free system comprising a CpG ODN identical to SEQ ID NO: 1 after thawing.

6. The method of claim 5 further comprising adding IL-12 at 1 ug/ml to said feeder free system after thawing.

7. The method of claim 5 further consisting of adding cytokines to said feeder free system after thawing.

8. The method of claim 6 further comprising adding CpG ODN identical to SEQ ID NO: 1 at a concentration of 3 ug/ml to 24 ug/ml.

9. A feeder free method of increasing viability, proliferation and cytotoxicity of isolated NK cells following cryopreservation comprising:

a. Cryopreserving NK cells expanded in a feeder free system;

b. Thawing said cryopreserved NK cells;

c. Culturing said thawed NK cells in a feeder free system;

d. Adding a supplement to said feeder free system, immediately after thawing, comprising CpG ODN that functions as a pathogen-associated molecular pattern.

10. The method of claim 9 further comprising adding IL-12 at a concentration of 1 ug/ml to said feeder free system immediately after thawing.

11. The method of claim 9 further consisting of adding cytokines to said feeder free system immediately after thawing.

12. The method of claim 10 further comprising adding CpG ODN that functions as a pathogen-associated molecular pattern at a concentration of 3 ug/ml to 24 ug/ml.

13. A feeder free method of increasing viability, proliferation and cytotoxicity of isolated NK cells following cryopreservation comprising:

a. Cryopreserving NK cells expanded in a feeder free system;

b. Thawing said cryopreserved NK cells;

c. Culturing said thawed NK cells in a feeder free system;

d. Adding a supplement to said feeder free system, after thawing, comprising a CpG ODN that functions as a pathogen-associated molecular pattern.

14. The method of claim 13 further comprising adding IL-12 at a concentration of 1 ug/ml to said feeder free system after thawing.

15. The method of claim 13 further consisting of adding cytokines to said feeder free system after thawing.

16. The method of claim 14 further comprising adding CpG ODN that functions as a pathogen-associated molecular pattern at a concentration of 3 ug/ml to 24 ug/ml.