The aim of this study is the safety and efficacy of cryosurgery plus natural killer(NK) immunotherapy to tumors in transplanted liver.

By enrolling patients with tumors in transplanted liver adapted to enrolled criteria, this study will document for the first time the safety and the short and long term efficacy of the combined therapy using cryosurgery and NK cells.

The safety will be evaluated by statistics of adverse reactions. The efficacy will be evaluated according to local relief degree, progress free survival (PFS) and overall survival (OS).

Inclusion Criteria:

• All standard therapies have failed according to NCCN guidelines or the patient refuses standard therapies after cancer recurrence
• Body tumor 1-6, the maximum tumor length < 5 cm
• KPS ≥ 70, lifespan > 6 months
• Platelet count ≥ 80×109/L，white blood cell count ≥ 3×109/L, neutrophil count ≥ 2×109/L, hemoglobin ≥ 80 g/L

Exclusion Criteria:

• Patients with cardiac pacemaker
• Patients with brain metastasis
• Patients with grade 3 hypertension or diabetic complication, severe cardiac and pulmonary dysfunction