ACT for prevention and prophylaxis of cancer-associated thrombosis (CAT)

e14135 Background: CAT is the 2nd leading cause of death in oncology patients and there is need for thrombosis management across the natural history of cancer because of its dynamic nature. Anticoagulant therapy is the cornerstone of prevention and treatment, since thrombosis interferes with cancer treatment, increases health care resource utilization, imposes emotional and economic burden. Methods: A prospective observational study conducted by HeSMO across Greece, aiming to record the clinical practice of CAT prophylaxis in patients with solid tumors. Ambulatory, high risk for thrombosis, active cancer patients who received thromboprophylaxis are enrolled after signing informed consent. Results: Preliminary results are collected from 17 oncology departments. From the 272 enrolled patients, 176 (64.7%) have completed second visit (3-4 cycles of anticancer treatment). Primary cancers included: lung 31.3%, pancreas 26.1%, colorectal 13.6%, gynecological cancers 10.2%, stomach 7.8%, bladder 6.3%, and others.75.6% of the patients had metastatic disease. 1/3 of the patients were smokers or ex-smokers, and 33% underwent surgery. Most of patients (65.9%) were at 1st line treatment and 17.6% at 2nd line. The vast majority (90.3%) were treated with High-Risk for Thrombosis Chemotherapy Agents (HRTCAs) such as cisplatin etc. Regarding Khorana score, 65.1% had ≥2. In particular, 86.7% of patients with Khorana score ≤1 received HRTCAs while 95.4% of patients with score = 2.All patients received thromboprophylaxis, specifically: 93.0% tinzaparin, 5.2% fondaparinux and 1.8% other (enoxaparin, bemiparin) with average duration 5.3±3.1 months. 67.1% of the patients received higher than standard prophylactic doses. 3 patients (1.7%) experienced thrombotic events (2 DVT and 1 PE). These 3 patients had metastases and were treated with HRTCAs. Five grade 1 bleeding events were reported (2.8%). Conclusions: Thromboprophylaxis of CAT is both safe and effective. Oncologists are alerted about CAT negative influences in cancer patients’ prognosis. Apart from Khorana score, factors such as metastases, use of HRTCAs along with drug-drug interactions, increase the LMWHs usage often in higher than prophylactic doses in CAT management. Clinical trial information: NCT03909399.