RT Journal Article SR Electronic T1 AIDS Therapy Evaluation in the Netherlands (ATHENA) national observational HIV cohort: cohort profile JF BMJ Open JO BMJ Open FD British Medical Journal Publishing Group SP e022516 DO 10.1136/bmjopen-2018-022516 VO 8 IS 9 A1 Tamara Sonia Boender A1 Colette Smit A1 Ard van Sighem A1 Daniela Bezemer A1 Catriona J Ester A1 Sima Zaheri A1 Ferdinand W N M Wit A1 Peter Reiss A1 , YR 2018 UL http://bmjopen.bmj.com/content/8/9/e022516.abstract AB Purpose In 1998, the AIDS Therapy Evaluation in the Netherlands (ATHENA) national observational HIV cohort was established to demonstrate the lifesaving effectiveness of triple combination antiretroviral therapy, including HIV-protease inhibitors, that had recently been made available for clinical use. Subsequently, the HIV Monitoring Foundation was established by the Dutch Ministry of Health, Welfare and Sport to continue ATHENA as an open cohort in order to continue the registration and monitoring of all HIV-positive people as an integral part of HIV care in all 26 HIV treatment centres in the Netherlands.Participants To date, a total of 25 036 participants have been enrolled in the cohort, with 263 600 person-years of follow-up. As of 1 January 2017, 19 035 HIV-1-positive participants were known to be in care: 18 824 adults (81% men and 19% women) and 211 children (47% boys and 53% girls). The remaining 6001 participants had either died (46%), were lost to care (29%) or had moved abroad (25%).Findings to date Today, with over 20 years of follow-up, the ATHENA cohort has provided extensive knowledge on HIV treatment, comorbidities and coinfections and created insight into the transmission dynamics of the HIV epidemic.Future plans ATHENA continues to enrol and monitor HIV positive people entering HIV care in the Netherlands. Future research will continue to provide tangible input into HIV care and prevention policies in the Netherlands and internationally.