Hong Kong Prostate Cancer Study Group Database

The prostate gland is a clinically important male accessory sex gland and vital for its production of semen. Prostate cancer (PCa) is ranked 3rd in annual incidence of male cancer and ranked 5th for cancer-related death in men in Hong Kong which accounts for about 9.1 deaths per 100,000 men in 2011. Its incidence is rising rapidly, almost tripled in the past 10 years. Although this cancer is extremely rare before age 40 but the incidence increases with age, as the elderly population continues to increase, the impact of PCa on the men's health and also the burden on health care system will continue to rise. In addition to age, epidemiological data shows that race is also an important risk factor for prostate cancer. African-American men have the highest rates of prostate cancer in the world. For Asian populations, native Chinese and Japanese showed the lowest prostate cancer rates, though the incidence is rapidly increasing in the past decades.

The two main screening methods for PCa are digital rectal examination (DRE) and serum prostate-specific antigen (PSA) level blood test. DRE is an exam to check for growths or enlargement of the prostate gland. A tumor in the prostate can often be felt as a hard nodule. This may be done as a regular exam or check for the symptoms. If problems are suspected, DRE is usually done together with PSA, which was first introduced to evaluate the possibility of present of PCa in 1987. A common PSA threshold for biopsy in Hong Kong and Asia is PSA level greater than 4.0 ng/mL. Despite the controversial of PSA and some newer markers for PSA diagnosis, it is still the most common screening for PCa, due to the low cost and simplicity.

The gold standard of diagnosis of PCa is transrectal ultrasound (TRUS) with prostate biopsy. During the procedure, usually ten cores of biopsies will be taken and sent for pathological evaluation. If any of the biopsies are found malignant, Gleason score will be given and the stage of cancer will be determined.

Unlike other malignancy, PCa is characterized by its slow progression nature and even for metastatic disease the 5-year survival is up to 20%. Therefore, there will be different kinds of management for difference age group and disease stage: active surveillance (AS), watchful waiting, and treatments. Watchful waiting is for older patients who presents with low-risk prostate cancer. In these cases, treatment is probably not suitable for them due to the old age and low effectiveness. Contrasting watchful waiting, AS is applicable to patients who are eligible for potentially curative management. During AS, PCa is closely monitored for signs of progression. PSA blood test and DRE are usually administered at times along with a repeat biopsy of the prostate at one year and then at specific intervals thereafter. If symptoms develop, or if tests indicate the cancer is growing, treatment will be necessary.

For early stage of prostate cancer, radiotherapy or radical prostatectomy are recommended as curative management. The purpose of these treatments is to cure the disease. Over 80% of patients were cured with no recurrence. Currently, robotic prostatectomy is the main surgical approach for localized prostate cancer with acceptable perioperative results. Radiotherapy, both external beam and brachytherapy, are also standard therapy for prostate cancer. The overall complication rate, as reported from the Western literatures, for both surgery and radiotherapy are quite low. The final choice of treatment will largely depend on the join decision between physicians and patients.

However, for advanced or recurrent prostate cancer, androgen deprivation therapy (ADT) is the main treatment modality. While the effectiveness of ADT is well documented in the literature, the adverse effect profile in Asian patients, in particular to the cardiovascular system and bone metabolism, was not well documented.

Due to the continue changes in the behavior of prostate cancer cell under androgen deprivated environment, advanced prostate cancer will eventually entered a stage of castration refractory prostate cancer (CRPC). Currently, there are many new agents, including second line hormonal therapy, chemotherapy, androgen biosynthesis inhibitors, immunotherapy, bone targeting agents etc., available for the further management of these CRPC patients. Unfortunately, the clinical outcome and side effect profiles for further treatment for patients with in local Chinese population, as well as in Asian population was still not that certain.

Due to the continue changes in the behavior of prostate cancer cell under androgen deprived environment, advanced prostate cancer will eventually entered a stage of castration refractory prostate cancer (CRPC). Currently, there are many new agents, including second line hormonal therapy, chemotherapy, androgen biosynthesis inhibitors, immunotherapy, bone targeting agents etc., available for the further management of these CRPC patients. Unfortunately, the clinical outcome and side effect profiles for further treatment for patients with in local Chinese population, as well as in Asian population was still not that certain.

Facing the increase in clinical demand by the drastic increase in patient population, together with the rapid development in various therapies for different stages of prostate cancer, there is a need to have better understanding about the natural history, clinical outcomes of various therapies for prostate cancer. Therefore, investigators would like to establish a local prostate cancer registry to facilitate the collection of clinical information and outcomes of prostate cancer management. Hopefully, this registry can provide information regarding the epidemiology, natural history, and treatment outcomes of local prostate cancer. The information would be helpful for research, public education, health care planning and also international collaboration. Ultimately, patients and public would be benefited from these works

In this study, both retrospective and prospective cohort study design will be adopted. Patients diagnosed with prostate cancer from 2016 will be captured prospectively and those who diagnosed in or before 2015 will be captured retrospectively. Patients diagnosed with prostate cancer in the hospitals under the New Territories East Cluster (NTEC) \& New Territories West Cluster (NTWC) will be identified in specialist clinics, wards, and during TRUS, and then enrolled to the study. This study will be conducted by observation; no intervention article is used. The time of diagnosis of prostate cancer will be set as baseline of that subject. All the demographic and medical background will be traced back. All patients will be followed up every 6 months and thereafter. During the follow-up, patients' medical status including survival, cancer status, treatment, complications will be captured from the medical records.