The problem with the data is that it s only referring to a small number of patients that were treated at one specific facility For all we know that facility was only for patients with high grade malignant tumors of a certain type It s not general all patients with tumors info By putting the table at the top of the Wikipedia article though it implies that these are survival rates for all patients with any type of tumor and that s just not true For example many patients with meningiomas the 2nd most common type of brain tumor live their entire lives without showing any symptoms at all let alone dying early