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Translational research biomarkers
1075 Contribution of NETosis in advanced stages of high-grade serous ovarian cancer: diagnostic implications
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  1. J Marí Alexandre1,
  2. B Mc Cormack1,
  3. J Oto-Martínez2,
  4. S Tomás Pérez1,
  5. A Fernandez-Pardo2,
  6. E Gonzalez-Canto1,
  7. F Cana2,
  8. C Aghababyan1,3,
  9. R Herranz2,
  10. S Cañete-Mota4,
  11. A Cuadros-Lozano1,3,
  12. L Martínez-Fernández1,3,
  13. A Aranda-Borreda2,
  14. A Arroyo-Alvarez1,
  15. N Santonja-Lopez3,
  16. R Ramirez-Belloch5,
  17. A Llueca6,7,
  18. P Medina3 and
  19. J Gilabert-Estelles1,3,8
  1. 1Research Foundation of Hospital General Universitario de Valencia, Research Laboratory in Biomarkers in Reproduction, Obstetrics and Gynecology, Valencia, Spain
  2. 2Haemostasis, Thrombosis, Atherosclerosis and Vascular Biology Research Group, Medical Research Institute Hospital La Fe, Valencia, Spain
  3. 3Consorcio Hospital General Universitario de Valencia, Gynecology and Obstetrics Service, Valencia, Spain
  4. 4General University Hospital of Castello, Obstetrics and Gynaecology Service, Castello de la Plana, Spain
  5. 5Consorcio Hospital General Universitario de Valencia, Medical Oncology Service, Valencia, Spain
  6. 6General University Hospital of Castelló, Multidisciplinary Unit of Abdominal Pelvic Oncology Surgery, Castello de la Plana, Spain
  7. 7University Jaume I, Departament of Medicine, Castello de la Plana, Spain
  8. 8University of Valencia, Pediatrics, Obstetrics and Gynecology, Valencia, Spain

Abstract

Introduction/Background*NETosis has recently been described as a new form of neutrophils’ immune response, by which they release extracellular networks (NETs) of DNA, histones and proteins. In the tumor environment, NETs participate in immunothrombosis, tumor progression, metastasis, and evasion of the immune system. Recent studies show that NETosis is involved in the initial metastasis of high-grade serous ovarian cancer (HGSOC), although its contribution in advanced stages or as a diagnostic biomarker is unknown, which is the objective of this study.

Methodology We analyzed paired plasma and ascites fluid samples from women with HGSOC (n=28) and controls (n=16). As NETosis markers, we quantified cell-free circulating DNA (cfDNA, Quant-iT PicoGreen dsDNA kit), nucleosomes (Cell Death Detection ELISAPLUS kit), calprotectin (Human Calprotectin ELISA kit) and myeloperoxidase (MPO) (Human MPO ELISA kit) and we evaluated their differences with the SPSS program (v.21).

Result(s)*Patients with HGSOC presented a higher concentration of cfDNA in plasma (median 1785,9 ng/mL; Q1-Q3, 1618,5-2181,6) compared to the controls (1526,7; 1452,0-1610,9) (p<0,001). In addition, we observed an increase in the 4 NETosis markers evaluated in patients’ ascites: cfDNA [(2128,9; 1477,8-2814,5) vs. (1148,1; 990,8-1235,3), p<0.001], nucleosomes [(2,58 AU; 1,27-3,16) vs. (0,09; 0,003-0,55), p<0,001], calprotectin [(2606,8 ng/mL; 1028,3-5021,7) vs. (353,5; 195,5-722,3), p<0,001] and MPO [(73,3 ng/mL; 48,8-141,4) vs. (25,3; 22.6-29,4); p<0,001] (figure 1).

The levels of the 4 markers were positively correlated with each other in both biofluids (p<0.032) and with the levels of neutrophils in plasma (p<0.001). We also observed that cfDNA in plasma was able to distinguish patients from controls (AUC=0.842). Furthermore, the levels of cfDNA, calprotectin and MPO in plasma showed statistically significant differences in related to neoadjuvant treatment. (Figure 2).

Abstract 1075 Figure 1
Abstract 1075 Figure 1

NETosis markers in ascites and plasma of patients with high-grade serous ovarian cancer (n=28) and controls (n=16). ***p<0.001

Abstract 1075 Figure 2
Abstract 1075 Figure 2

NETosis makers in ascites and plasma of patients with high-grade serous ovarian cancer who redved neo-adjuvancy (n=9) and who did not (n=19). NA: neo-adjuvancy; DS: debulking surgery. *p<0.01

Conclusion*The observed correlation between the values of the different markers and neutrophils’ levels suggests their validity as biomarkers of NETosis. For the first time, we describe an increase in NETosis markers in ascites of advanced HGSOC, which could show the contribution of NETosis in the progression of HGSOC in the pelvic microenvironment. Furthermore, cfDNA in plasma could represent a minimally invasive diagnostic biomarker for HGSOC that could reduce the pre-surgical rate of false positives.

https://doi.org/10.1136/ijgc-2021-ESGO.604

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