There is no specific normal or abnormal PSA level, but, rising PSAs over time rather than a single elevated PSA, is a sign that prostate cancer needs to be taken in consideration more seriously.
PSA levels of 5.46 are translated as slightly to moderately elevated.
Biopsy results with score 7 are known as moderately-differentiated or intermediate-grade of prostate cancers.
Score 9 means poorly-differentiated or high-grade prostate cancer.
Liver, bones, lungs are usual sites for prostate metastases.
Having metastases at any of these places, makes defining prostate cancer as a stage 4 that is advance one.
Hypodense lesions on liver CT can be cysts, hemangiomas (benign tumors), or metastases.
Small, sharply defined and hypodense lesions are mostly benign.
Was your father made some tests for systemic infections?