{"chart":{"slug":"clinical-trials-by-condition","title":"Which diseases get the most clinical trials?","takeaway":"About 85,000 clinical trials registered on ClinicalTrials.gov as of November 2026 study cancer and other tumors, more than any other disease group; brain and nerve diseases come next with about 57,000. Groups are the National Library of Medicine's disease categories, and a trial counts in every group its conditions fall under, so the bars add up to more than the total.","topic":"Clinical trials","chart_type":"bar","ranking":true,"x_label":"Disease group","y_label":"Clinical trials (all years)","unit":null,"points_count":20,"source":{"name":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2","url":"https://clinicaltrials.gov/data-api/api"},"license":{"name":"Public domain (U.S. government work); source National Library of Medicine","url":"https://www.nlm.nih.gov/web_policies.html#copyright"},"data_as_of":"2026-11-03","updated_at":"2026-11-03T17:18:12.813Z","url":"https://chart.ly/charts/clinical-trials-by-condition","api_url":"https://chart.ly/api/v1/charts/clinical-trials-by-condition","csv_url":"https://chart.ly/charts/clinical-trials-by-condition/data.csv","image_url":"https://chart.ly/charts/clinical-trials-by-condition/image.png","embed_url":"https://chart.ly/charts/clinical-trials-by-condition/embed","credit":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via Chartly (https://chart.ly/charts/clinical-trials-by-condition)","credit_html":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via \u003ca href=\"https://chart.ly/charts/clinical-trials-by-condition\"\u003eChartly\u003c/a\u003e","average_label":null,"zero_axis":true,"data":[{"label":"Cancer and other tumors","value":84658},{"label":"Brain and nerve diseases","value":56897},{"label":"Heart and blood vessel diseases","value":44227},{"label":"Kidney, urinary and genital diseases","value":41032},{"label":"Mental health conditions","value":40599},{"label":"Metabolic diseases, incl. diabetes and obesity","value":38912},{"label":"Lung and airway diseases","value":37527},{"label":"Immune system diseases","value":37041},{"label":"Digestive diseases","value":34020},{"label":"Infections","value":33518},{"label":"Skin and connective tissue diseases","value":29657},{"label":"Hormone (endocrine) diseases","value":27519},{"label":"Pregnancy complications","value":27477},{"label":"Blood diseases","value":23446},{"label":"Bone, joint and muscle diseases","value":20795},{"label":"Inherited and newborn conditions","value":16520},{"label":"Injuries","value":16478},{"label":"Eye diseases","value":10873},{"label":"Mouth and teeth diseases","value":10158},{"label":"Ear, nose and throat diseases","value":5869}],"annotations":[]},"docs":"https://chart.ly/developers","terms":"Free to use with credit: wherever you show or quote a chart's data, name Chartly with a link to that chart's url (each chart's credit line does both) and credit its source as its license asks.","credit":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via Chartly (https://chart.ly/charts/clinical-trials-by-condition)"}