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The safety, efficacy, and treatment outcomes of a combination of low-dose decitabine treatment in patients with recurrent ovarian cancer.

Purpose : DNA demethylating agents have shown clinical effectiveness in hematological and solid tumors. This trial tested the safety, efficacy, and treatment outcomes of decitabine-based chemotherapy or combined with immunotherapy in recurrent ovarian cancer patients. Patients and methods : Fifty-five patients with recurrent ovarian cancer were enrolled and 52 were assessable for clinical response and survival. Patients either received 5-d decitabine treatment, followed by reduced-dose of paclitaxel/carboplatin administration (DTC cohort), or the aforementioned regimen combined with cytokine-induced killer cells therapy (DTC+CIK cohort). The primary end point was clinical response rate and progression-free survival (PFS). Secondary evaluation included safety assessment and overall survival (OS). Results : Disease control rate (DCR) and objective response rate (ORR) were 73.91% and 23.91% in disease measurable patients by RECIST criteria, totally 76.92% and 30.77%, including disease non-measurable patients, which were higher in platinum-resistant/refractory patients. Clinical benefits could be associated with the number of DAC treatment cycles and the inclusion of CIK immunotherapy. In DTC+CIK cohort, DCR and ORR reached 100% and 58.30%, respectively. Notably, DTC+CIK treatment in platinum-resistant/refractory patients had an ORR of 87.50%. Consistently, PFS was longer in platinum-resistant/refractory patients comparing with that of platinum-sensitive patients. PFS and OS were 8 and 19 mo in platinum-resistant/refractory patients with DTC+CIK therapy. The most common toxicities were nausea, anorexia, fatigue, neutropenia, and anemia; many of which were grade 1-2. Conclusion : Low-dose DAC/paclitaxel/carboplatin regimen demonstrates disease benefit, especially in patients with platinum-resistant/refractory ovarian cancer, and might show remarkable clinical response when combined with adoptive immunotherapy in platinum-resistant/refractory ovarian cancer patients.

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