Diagnosed with cancer, yellow fluid dripping from nose, living on ventilator. Prognosis?

hi!two days back i came to know about my uncle s malignancy but we dont know what kind it is. he is hospitalised in ,treatment has not started yet. today they told us that the infection has infected his entire body and there is no treatment unless of ventilation. they even dont know the stage of the disease.not losing the hope we want to take second opinion. he had gone through the major surgery to know the disease ten days back.after few hours of surgery some yellow fluid was coming out from his nos,it stopped now living his health more critical. please suggest.