The Gleason score of 9 for prostate cancer refers to a pathological type of prostate cancer that generally has a high degree of tumor malignancy, is prone to peripheral invasion and distant metastasis, and has a poor prognosis. The Gleason score system is a pathological assessment of the malignancy of prostate cancer, which is mainly based on the degree of differentiation of prostate cancer and the specific tissue structure. The lower the degree of differentiation, the higher the score, and the greater the degree of tissue structure variation, the higher the score, both of which add up to the total score, with a score of 8-10 belonging to a high degree of malignancy, and a score of 9 is currently shown to belong to the corresponding range, with a poorer prognosis. In addition to the scoring system, the severity of prostate cancer should also be combined with imaging tests and PSA (prostate specific antigen) for comprehensive judgment. Patients should undergo standardized treatment under the guidance of clinicians. It is recommended that patients seek timely medical treatment and follow the doctor’s instructions, and do not blindly assess the condition on their own in order to avoid delays.