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I'm very sorry to hear about Hero's diagnosis. Cats can be very skilled at hiding signs of pain, so it is important to observe him closely for any changes in behavior. A good appetite is a good indicator that he is feeling generally well right now. If his eye has discharge or blood, the malignancy could be growing or irritating the delicate tissue of the eye. Your vet can prescribe some topical medications to help control these secondary problems. This may reduce inflammation and help with pain.