These factors include:

Possible harms from the screening test: for example, X-ray images involve exposure to potentially harmful ionizing radiation
The likelihood of the test correctly identifying cancer
The likelihood that cancer is present: Screening is not normally useful for rare cancers. Possible harms from follow-up procedures
Whether suitable treatment is available
Whether early detection improves treatment outcomes
Whether the cancer will ever need treatment
Whether the test is acceptable to the people: If a screening test is too burdensome (for example, extremely painful), then people will refuse to participate. Cost

Recommendations
U.S. Preventive Services Task Force
The U.S. Preventive Services Task Force (USPSTF) issues recommendations for various cancers:

Strongly recommends cervical cancer screening in women who are sexually active and have a cervix at least until the age of 65. Recommend that Americans be screened for colorectal cancer via fecal occult blood testing, sigmoidoscopy, or colonoscopy starting at age 50 until age 75. Evidence is insufficient to recommend for or against screening for skin cancer, oral cancer, lung cancer, or prostate cancer in men under 75. Routine screening is not recommended for bladder cancer, testicular cancer, ovarian cancer, pancreatic cancer, or prostate cancer. Recommends mammography for breast cancer screening every two years from ages 50–74, but does not recommend either breast self-examination or clinical breast examination. A 2013 Cochrane review concluded that breast cancer screening by mammography had no effect in reducing mortality because of overdiagnosis and overtreatment. Japan
Screens for gastric cancer using photofluorography due to the high incidence there. Genetic testing
Genetic testing for individuals at high-risk of certain cancers is recommended by unofficial groups.
It is believed that CPAP therapy can increase both muscle endurance as well as strength because it overloads the levator veli palatini muscle and involves a regimen with a large number of repetitions of velar elevation. Research findings proved that patients with hypernasality due to flaccid dysarthria, TBI or cleft palate do eliminate hypernasality after receiving this training program. Surgery
The two main surgical techniques for correcting the aberrations the soft palate present in hypernasality are the posterior pharyngeal flap and the sphincter pharyngoplasty. After surgical interventions, speech therapy is necessary to learn how to control the newly constructed flaps. Posterior pharyngeal flap
Posterior pharyngeal flap surgery is mostly used for vertical clefts of the soft palate. The surgeon cuts through the upper layers of the back of the throat, creating a small square of tissue. This flap remains attached on one side (usually at the top). The other side is attached to (parts of) the soft palate. This ensures that the nasal cavity is partially separated from the oral cavity. When the child speaks, the remaining openings close from the side due to the narrowing of the throat caused by the muscle movements necessary for speech. In a relaxed state, the openings allow breathing through the nose. Sphincter pharyngoplasty
Sphincter pharyngoplasty is mostly used for horizontal clefts of the soft palate. Two small flaps are made on the left and right side of the entrance to the nasal cavity, attached to the back of the throat.