Allogenic natural killer cell immunotherapy of sizeable ovarian cancer: A case report

Masses are often detected in the abdomen of patients with sizeable ovarian cancer. There are currently no effective treatments available for late-stage ovarian cancer. Immunotherapy is gaining increasing attention worldwide in the clinical setting due to its ability to eliminate tumor cells and its favorable toxicity profile. We herein report the case of a 60-year-old woman who received allogenic natural killer (NK) cell immunotherapy for a sizeable ovarian carcinoma and achieved a noteworthy response. NK cells were isolated from the donor's peripheral blood mononuclear cells, and the cell numbers were increased to 8-10 billion [corrected]. The activated cells were expanded ex vivo for 14 days prior to intravenous infusion. After six infusions of NK cell therapy >3 months, the level of carbohydrate antigen 125 decreased significantly (from 11,270 to 580 U/ml). Furthermore, the size of the masses in the abdomen was markedly reduced. Overall, the treatment had few adverse effects and it prolonged patient survival. The present data and the patient response suggest that allogenic NK cell immunotherapy is a promising approach for ovarian cancer, with few treatment-related adverse effects. The patient received six intravenous infusions of allogenic HANK cells between March, 2015 and June, 2015, but discontinued in October, 2015 and succumbed to the disease in March, 2016 following relapse.