does oral cancer, end stage, painful and agonising ? My sisterinlaw has mouth cancer, she was told about 2 months ago the surgery to remove her tongue and jaw was not possible due to the advanced state of the cancer. Now she is at home has gangrene of the neck, dark green stuff coming out of her trach , from her nose down is totally unrecognisable. her demise seems to be long and very slow. is that common ?