KLK3 and prostate lymphoma: For the diagnosis of primary lymphoma of the prostate, in addition to routine examinations, urological ultrasound, abdominal and pelvic CT, MRI, positron emission tomography (PET)-CT, whole-body bone scan, cystoscopy, bone marrow biopsy, PSA, LDH, and other examinations are all optional items, which can help to achieve accurate staging and assess the prognosis [6].