Antiphospholipid antibodies as a potential factor of tumor progression

Abstract

Introduction. Current generally accepted clinical and laboratory criteria for antiphospholipid syndrome (APS) have been clearly determined, which include vascular thrombosis and pregnancy complications in patients with circulating antiphospholipid antibodies (aPLs). However, in the last several years, aPLs have become a common finding in patients with malignancies. Accumulating data provide strong evidence for such association and suggests that thrombosis in cancer patients may be related to aPLs activity. According to global publications, aPLs circulation in cancer patients varies from 15 to 74 %, which may be due to differences in clinical characteristics of cancer patients examined as well as distinct interpretations on aPLs diagnostic tests.Aim: to determine aPLs profile in patients with malignant neoplasms of the female reproductive system, identify an association between aPLs and thrombosis as well as degree of disease progression and outcome.Materials and Methods. A single-center observational study was conducted with 130 women, among which 70 subjects had adenocarcinoma of the uterine body, cervix and ovaries. 60 age-matched apparently healthy women lacking thrombotic complications were included into control group. All study participants were examined for circulating lupus anticoagulantas well as anti-cardiolipin antibodies (aCLs), anti-β2-glycoprotein 1 antibodies (anti-β2-GР1), annexin V antibodies, and anti-phosphatidylserine-prothrombin complex antibodies (anti-PS-PT) IgG and IgM by using enzyme-linked immunosorbent assay.Results. Moderate or low aPLs titers were found in 34.2 % of patients with uterine, cervical and ovarian cancer. Ten (14.2 %) of 70 women in main study group had thrombosis so that aPLs were detected only in 5 of 10 women with thrombosis. No significant differences between patients with thrombosis and without thrombotic complications in gynecological cancer were observed. In addition, assessed parameters had no impact on relapse-free survival in cancer patients. However, a significant relation was found between circulating aCLs (IgG, IgM) and anti-PS-PT (IgG, IgM) as well as degree of oncological process. In addition, a significant association was found between aCLs isotype IgG (p = 0.017) and disease relapse.Conclusion. Although thrombosis along with acute thrombosis is a hallmark of APS patients, they demonstrate other non-thrombotic manifestations, one of which is the impact on tumor growth invasion and progression.