The majority of our international Oncotype DX breast and colon cancer test revenues come from direct payor reimbursement, payments from our distributors, patient self-pay, and clinical collaborations in various countries. We have obtained some coverage, which varies substantially from country to country, for our breast cancer test outside of the United States, including in Argentina, Canada, the Czech Republic, Germany, Greece, Hungary, Ireland, Israel, Saudi Arabia, Spain, Switzerland and the United Kingdom.
We established reimbursement with NHS England following the National Institute for Health and Care Excellence, or NICE, recommendation for our breast cancer test, and in 2015 we began to receive payments from NHS England trusts with whom we have completed contractual arrangements. In December 2018, NICE issued updated guidance to include patients with micrometastases, while continuing to recommend the Oncotype DX breast cancer test for use in clinical practice to guide chemotherapy treatment decisions for certain patients with early stage, N-, hormone receptor positive, human epidermal growth factor receptor 2, or HER2, negative, invasive breast cancer.
In 2014, the Gynecologic Oncology Working Group, or AGO, in Germany first updated their guidelines to recommend Oncotype DX as the only breast cancer gene expression test to predict chemotherapy benefit in early-stage, hormone receptor-positive invasive breast cancer. Additionally, in its updated assessment of breast cancer gene expression profiling tests, the German Institute for Quality and Efficiency in Health Care, or IQWiG, concluded in September 2018 that only the Oncotype DX Breast Recurrence Score test has sufficient evidence to guide breast cancer adjuvant chemotherapy decisions based on the Trial Assigning IndividuaLized Options for Treatment (Rx), or TAILORx, study results. Also, each of the AGO in Germany and the Japan Breast Cancer Society recently updated their guidelines to recommend Oncotype DX as the only breast cancer gene expression test to predict chemotherapy benefit in early-stage, hormone receptor-positive invasive breast cancer. In June 2019, the German Federal Joint Committee, or G-BA, issued a positive reimbursement decision for the Oncotype DX Breast Recurrence Score test, which will provide wide national coverage for patients with early stage, primary N-, hormone receptor positive, HER2-negative breast cancer.
We expect that it will take several years to establish broad coverage and reimbursement for our Oncotype DX breast, colon and prostate cancer tests with payors in countries outside of the United States and there can be no assurance that our efforts will be successful.
Oncotype DX Breast Cancer Tests
We expect to continue to focus substantial resources on pursuing adoption of and reimbursement for our Oncotype DX breast cancer test including through the development of a distributable in vitro diagnostic, or IVD, version of the Oncotype DX breast cancer test, offered on the Biocartis Idylla platform, which we currently anticipate will be available in select European markets beginning in 2020. We believe increased demand for our Oncotype DX breast cancer test resulted from the impact of the Trial Assigning IndividuaLized Options for Treatment (Rx), or TAILORx, results in June 2018, our ongoing commercial efforts, expanded utility for new breast cancer patient groups, continued publication of peer-reviewed articles on studies we sponsored, conducted or collaborated on that support the use of and reimbursement for the test, clinical presentations at major symposia, and the inclusion of our breast cancer test in clinical practice guidelines for, node negative, or N−, estrogen receptor positive, or ER+, invasive disease. However, this increased demand is not necessarily indicative of future growth rates, and we cannot provide assurance that this level of increased demand can be sustained or that publication of articles, future appearances or presentations at medical conferences, increased commercial efforts or expansion of utility to new breast cancer patient groups will have a similar impact on demand for our breast cancer test in the future. Sequential quarterly demand for our breast cancer test may also be impacted by other factors, including the economic environment and seasonal variations that have historically impacted physician office visits, any shift in commercial focus, patient enrollment in Oncotype DX clinical studies and the number of clinical trials in process by cooperative groups or makers of other tests conducting experience studies.
In June 2018, the results of the TAILORx trial were published in The New England Journal of Medicine and presented at the plenary session of the 2018 American Society of Clinical Oncology annual meeting. The TAILORx trial was independently designed and led by ECOG-ACRIN Cancer Research Group under the sponsorship of the National Cancer Institute, or NCI. TAILORx represents the largest breast cancer treatment trial ever conducted, and thousands of investigators enrolled more than 10,000 women across approximately 1,200 sites in six countries. With regard to the