Is a cancer patient whose doctor has informed him that he will die in, for example, three months, considered to be in a life-threatening illness to which the Sharia rulings apply?

The illness that incapacitates its sufferer is one that medical professionals have determined to have a high mortality rate. Therefore, the reference for identifying dangerous diseases is specialized doctors. If a cancer patient, who has been informed by his doctor of his impending death, makes donations and then dies from his illness, his donations are not effective beyond one-third of his estate for a non-heir, nor is anything effective for his heirs except with their permission. This is because donations made during a dangerous death illness are considered to be from one-third of the wealth, as stated in the Hadith: "Indeed, Allah has bestowed upon you, at the time of your death, a charity from one-third of your wealth."