PROGNOSIS AND SURVIVAL
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1 CANCER ASSOCIATED THROMBOSIS PROGNOSIS AND SURVIVAL Since French internist Armand Trousseau reported the occurrence of mysterious thrombotic disorders in cancer patients in the mid-19th century, the link between cancer and hypercoagulable states has been confirmed and well documented. Cancer alone is associated with a more than 1 four-fold risk of thrombosis. The prothrombotic state of malignancy occurs due to the ability of tumour cells to activate the coagulation system, placing cancer patients at an elevated risk of venous thromboembolism (VTE; deep vein thrombosis [DVT] and pulmonary embolism [PE]). This hypercoagulation is responsible for a significant percentage of mortality and morbidity in cancer patients. 2 CONTENTS Prognosis Prognosis Research has confirmed that patients with concurrent VTE and Complications malignancy have a more than threefold higher risk of recurrent References thromboembolic disease and death than patients with DVT/PE without malignancy. Thromboembolic events are the second leading cause of death in cancer patients receiving chemotherapy(after cancer itself) and, even among patients who survive an episode of VTE, complications such as recurrent VTE, post-thrombotic syndrome, and chronic thromboembolic pulmonary hypertension are common, costly, and have a profound impact on the patient's quality of life. Compounding the underlying pathophysiologic propensity for coagulation, patients with cancer also have a number of extrinsic factors that increase the thrombotic risk. These include surgery, anti-cancer therapies (chemotherapeutic and antiangiogenic agents), hormonal therapy, long-term immobilisation, central venous catheters, cancer type, and advanced disease stage. For example, a study in lung cancer patients found the risk of VTE was 30% higher among patients undergoing chemotherapy (compared to those not receiving chemotherapy), and VTE was responsible for nearly half (46.3%) of all deaths in patients undergoing cancer surgery
2 Complications VTE recurrence Research has demonstrated that patients who develop cancer-associated thrombosis have a three-fold higher risk for recurrent VTE than patients who had an initial VTE in the absence of malignancy. Approximately 25% of cancer patients with VTE require readmission because of bleeding or recurrent VTE. Post-thrombotic syndrome An estimated 23% - 60% of patients who develop DVT will develop post-thrombotic syndrome (PTS), frequently occurring within two years of the DVT episode. PTS is a chronic, potentially disabling condition, manifesting as swelling, pain, oedema, fibrosis, and venous ectasia. A blood clot in a leg vein can cause inflammation and block blood flow, causing damage to the tiny valves that control the direction of blood flow. The damaged valves become leaky, allowing fluid to pool around the ankles, and the leg becomes painful, red, and swollen. As PTS worsens, poor blood flow in the leg can cause painful leg ulcers that require long-term nursing care. 9 Chronic thromboembolic pulmonary hypertension Chronic thromboembolic pulmonary hypertension (CTPH) - a form of pulmonary hypertension caused by old blood clots in the lungs (pulmonary embolism) - is associated with considerable morbidity and mortality. This condition was believed to be a rare complication of PE, arising in approximately 1% of patients, but a recent study found that CTPH is relatively common. This prospective, long-term, follow-up study found that the cumulative incidence of symptomatic CTPH was up to 4% at two years post-pe event. Incidental thrombosis Increasingly, VTE is being diagnosed as an incidental finding on CT scans ordered for other indications, such as staging or restaging of cancer. In a study of gastrointestinal cancer patients, half of all DVTs and over 35% of PE were incidentally discovered. Another study found that 44% of all venous and arterial thromboembolic events in cancer patients receiving chemotherapy were incidental. Occult cancer Not only is VTE a common complication in patients with cancer, it may be the first manifestation of cancer. Almost one in ten patients who present with unprovoked or idiopathic VTE will be diagnosed with cancer within the first two years after their thrombotic 14, event. It is reported that, in cases where cancer is diagnosed after an episode of VTE, the cancer is often advanced (approximately 40% have metastatic cancer at diagnosis outcome is very poor, with a one-year survival of only 12% ) and the
3 Research has suggested that an initial assessment consisting of a comprehensive medical history, physical examination and basic laboratory testing will detect a large proportion of occult cancers in patients with idiopathic VTE. In a study of almost 900 patients with acute VTE, an initial routine clinical evaluation for malignancy identified cancer in 4% of patients; a further limited diagnostic work-up identified another 1.6% of cancers, with a one-year followup revealing cancer in another 1.7% of patients. The authors concluded that routine examination identified more than half of the malignancies, predominantly at an early stage. NICE guidelines (CG144: Venous thromboembolic diseases: the management of venous thromboembolic diseases and the role of thrombophilia testing) recommend that all patients diagnosed with unprovoked DVT or PE, who are not already known to have cancer, should be offered the following investigations for cancer: A physical examination (guided by the patient's full history) and A chest Xray and Blood tests (full blood count, serum calcium and liver function tests) and Urinalysis. 18 In addition, physicians should consider further investigations for cancer with an abdominopelvic CT scan (and a mammogram for women) in all patients aged over 40 years with a first unprovoked DVT or PE who do not have signs or symptoms of cancer based on initial investigation. 19 Two-way clinical association A growing body of data has confirmed a two-way clinical association between cancer and thrombosis. Research has shown that malignant tumour growth can trigger activation of the coagulation cascade, which not only leads to a prothrombotic environment that manifests as VTE but also has a profound effect on tumour cell behaviour, eliciting or enhancing tumour cell survival, invasion, metastasis, and angiogenesis. Supporting this theory that activation of the coagulation system contributes to tumour aggressiveness and vice versa, various authors have described a significant correlation between thrombosis and a poorer cancer prognosis. A Danish study revealed that a diagnosis of DVT or PE within one year of a cancer diagnosis is a significant predictor of death. Even when patients were matched by the type of cancer, age, sex, and year of diagnosis, the firstyear survival rate was 12% in cancer patients with VTE, compared to 36% in cancer patients without a diagnosis of thromboembolic events. 21 As antithrombotic therapy has proven beneficial effects on survival in patients with cancer in terms of treatment and prevention of VTE, clinical evidence spanning thirty years of antithrombotic agents suggests their administration to cancer patients may also have a direct effect on tumours and influence survival. 20
4 In the Veterans Administration (VA) Co-operative trial, the potential benefit of warfarin therapy in cancer was evaluated. Patients with lung-colon, head and neck, and prostate cancer were randomised to either warfarin in addition to standard treatment, or standard treatment alone for a period of 26 weeks. The main outcome showed no significant difference between the two arms, however, among the 50 patients with small-cell lung cancer (SCLC) there was significant improvements in time to disease progression and in overall survival. A follow up study targeting almost 330 SCLC patients receiving chemotherapy with or without warfarin therapy reported a statistically significant advantage in the warfarin group in achieving complete or partial responses, and an improvement in overall survival. More recently, thromboprophylaxis with low molecular weight heparin (LMWH) has demonstrated tangible anticancer effects in several clinical trials encompassing a wide array of malignancies References 1. Heit JA, et al. Risk factors for deep vein thrombosis and pulmonary embolism: a population based casecontrol study. Arch Intern Med. 2000;160: Caine GJ, Stonelake PS, Lip G, et al. The Hypercoagulable State of Malignancy: Pathogenesis and Current Debate. Neoplasia 2002; 4(6): Levitan N, et al. Rates of initial and recurrent thromboembolic disease among patients with malignancy versus those without malignancy Risk analysis using Medicare claims data. Medicine (Baltimore)1999; 78(5): Khorana AA. Cancer associated thrombosis: updates and controversies. ASH Education Book 2012; 2012(1): Huang H, et al. Incidence of venous thromboembolism among chemotherapy treated patients with lung cancer and its association with mortality: a retrospective database study.j Thromb Thrombolysis 2012; 34(4): Agnelli G, et al. A clinical outcome based prospective study on venous thromboembolism after cancer surgery: project. Ann Surg. 2006;243: Bullano MF, et al. Longitudinal evaluation of health plan cost per venous thromboembolism or bleed event in patients with a prior venous thromboembolism event during hospitalization. J Manag Care Pharm.2005; 11: Ashrani AA, Heit JA. Incidence and cost burden of post thrombotic syndrome. J Thromb Thrombolysis 2009; 28: Kahn SR, Solymoss S, Lamping DL, et al. Long term Outcomes After Deep Vein Thrombosis: Postphlebitic Syndrome and Quality of Life. J Gen Intern Med 2000; 15(6): Pengo V, et al. Incidence of chronic thromboembolic pulmonary hypertension after pulmonary embolism. N Engl J Med. 2004; 350: Singh R, et al. High rates of symptomatic and incidental thromboembolic events in gastrointestinal cancer patients. J Thromb Haemost 2010; 8: Moore RA, et al. High incidence of thromboembolic events in patients treated with cisplatin based chemotherapy: a large retrospective analysis. J Clin Oncol 2011; 29: White RH, et al. Incidence of venous thromboembolism in the year before the diagnosis of cancer in 528,693 adults. Arch Intern Med. 2005; 165: Murchison JT, Wylie L, Stockton DL. Excess risk of cancer in patients with primary venous thromboembolism: a national, population based cohort study. Br J Cancer. 2004;91:92 95.
5 15. Prandoni P, et al. Deep vein thrombosis and the incidence of subsequent symptomatic cancer. N Engl J Med 1992; 327: Karimi M, et al. Cancer Associated Thrombosis.Open Cardiovasc Med J 2010; 4: Sorensen H, et al. The risk of a cancer after primary deep venous thrombosis or pulmonary embolism. N Engl J Med 1998; 338: Monreal M, et al. Screening for occult cancer in patients with acute deep vein thrombosis or pulmonary embolism. J Thromb Haemost 2004; 2: NICE clinical guideline 144. Venous thromboembolic diseases: the management of venous thromboembolic diseases and the role of thrombophilia testing. 1.5 Investigations for Cancer. June Rak J, et al. Tissue factor in cancer and angiogenesis: the molecular link between genetic tumor progression, tumor neovascularization, and cancer coagulopathy. Semin Thromb Hemost 2006; 32: Sørensen HT, et al. Prognosis of cancers associated with venous thromboembolism. N Engl J Med. 2000; 343(25): Zacharski LR, et al. Effect of warfarin anticoagulation on survival in carcinoma of the lung colon, head and neck, and prostate. Final report of VA Cooperative Study no. 75. Cancer : Chahinian AP, et al. A randomized trial of anticoagulation of warfarin and of alternating chemotherapy in extensive small cell lung cancer by the Cancer and Lukemia Group B. J Clin Oncol 1989; 7: Petralia GA, et al. Mechanisms of disease: the impact of antithrombotic therapy in cancer patients. Nat Clin Pract Oncol 2005; 2:
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