KLK3 and cancer: The results showed that patients’ aged ≥ 75 years old, who have a household income ratio between 0 and 1, an ethnicity of non-Hispanic black, education of less than high school level, a relationship status of single, BMI value below 25, glycohemoglobin level > 7.00%, total cholesterol > 4.10 mmol/L, high-density lipoprotein level > 3.50 mmol/L, and patients who have hypertension and cancer should be our focus for screening BPA concentration and PSA.