Because they are afraid of patients after knowing the truth, the patient's physical condition could be worse, or even to give up hope of survival, to abandon treatment.
Because they are afraid of the patients know the truth, the physical condition of the patient is likely to be worse, and even give up hope of survival, to give up treatment.
Because they fear patients know the truth, the patient's physical condition is likely to be even worse, even give up the hope of survival, give up treatment.