You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is In which of the following cancer screening is least useful? and explain in detail?
Screening for Ca Lungs require chest X rays every 6 months and sputum cytology. It is not recommended or practical. According to the U.S. Preventive Services Task Force (USPSTF), there is insufficient evidence to recommend for or against screening for lung cancer and prostate cancer in men under 75. There is insufficient evidence to recommend for or against screening for skin cancer and oral cancer. Routine screening is not recommended for bladder cancer, testicular cancer, ovarian cancer and pancreatic cancer.