A third of the most popular articles about cancer treatment on social media contain inaccurate information, most of which could lead to patient harm, according to a study in the Journal of the National Cancer Institute. "I encounter a lot of patients through my oncology practice who believe misinformation they read online and through social media, and it has led to delays in their diagnosis and treatment ... refusal of proven cancer treatments and, ultimately, their early deaths," said study leader Dr. Skyler Johnson, a radiation oncologist.