You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Serum selenium concentration and antioxidant activity in cervical cancer patients before and after treatment . AIM In the present study , the effect of chemo and radio therapies on serum trace elements content and antioxidant activity in blood serum of cervical cancer patients was evaluated . METHODS Among 104 cervical cancer patients selected for the present study , 54 and 50 patients were treated with chemo- and radiotherapy respectively . Plasma Se , Zn , Cu and some enzymatic antioxidants activities were estimated in serum before and after the treatment . RESULTS The decreased levels of serum trace elements , glutathione peroxidase activity and total antioxidant capacity , and increased malondialdehyde , glutathion reductase was observed in cervical cancer patients when compared to healthy controls . The increased concentration of serum Se , Zn was observed in patients treated with chemotherapy . Simultaneously there was a significant ( P < 0.001 ) increase in glutathione peroxidase and total antioxidant capacity , and significant decrease ( P < 0.05 ) in malondialdehyde and glutathion reductase levels in the serum of patients treated with chemotherapy compared to the patients treated with radiotherapy . CONCLUSION The results demonstrated that chemotherapy but not radiotherapy results in significant increase in the trace elements levels and antioxidant activities in blood serum of cervical cancer patients .
{"Intervention": ["chemo- and radiotherapy", "chemotherapy", "radiotherapy", "selenium"], "Outcome": ["malondialdehyde and glutathion reductase levels", "malondialdehyde , glutathion reductase", "serum trace elements", "glutathione peroxidase activity and total antioxidant capacity", "glutathione peroxidase and total antioxidant capacity", "concentration of serum Se , Zn", "trace elements levels and antioxidant activities", "antioxidant activity"], "Participant": ["54", "chemotherapy", "50", "cervical cancer", "104"]}