This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)(Learn how and when to remove this template message)
Survival rate is a part of survival analysis. It is the percentage of people in a study or treatment group still alive for a given period of time after diagnosis. It is a method of describing prognosis in certain disease conditions. Survival rate can be used as yardstick for the assessment of standards of therapy. The survival period is usually reckoned from date of diagnosis or start of treatment. Survival rates are important for prognosis, but because the rate is based on the population as a whole, an individual prognosis may be different depending on newer treatments since the last statistical analysis as well as the overall general health of the patient. There are various types of survival rates (discussed below). They often serve as endpoints of clinical trials and should not be confused with mortality rates, a population metric.
Patients with a certain disease (for example, colorectal cancer) can die directly from that disease or from an unrelated cause (for example, a car accident). When the precise cause of death is not specified, this is called the overall survival rate or observed survival rate. Doctors often use mean overall survival rates to estimate the patient's prognosis. This is often expressed over standard time periods, like one, five, and ten years. For example, prostate cancer has a much higher one-year overall survival rate than pancreatic cancer, and thus has a better prognosis.
Sometimes the overall survival is reported as a death rate (%) without specifying the period the % applies to (possibly one year) or the period it is averaged over (possibly 5 years), eg. Obinutuzumab: A Novel Anti-CD20 Monoclonal Antibody for Chronic Lymphocytic Leukemia.
Net survival rate
When someone is interested in how survival is affected by the disease, there is also the net survival rate, which filters out the effect of mortality from other causes than the disease. The two main ways to calculate net survival are relative survival and cause-specific survival or disease-specific survival.
Relative survival has the advantage that it does not depend on accuracy of the reported cause of death; cause specific survival has the advantage that it does not depend on the ability to find a similar population of people without the disease.
Relative survival is calculated by dividing the overall survival after diagnosis of a disease by the survival as observed in a similar population that was not diagnosed with that disease. A similar population is composed of individuals with at least age and gender similar to those diagnosed with the disease.
Cause-specific survival and disease-specific survival
Disease-specific survival rate refers to "the percentage of people in a study or treatment group who have not died from a specific disease in a defined period of time. The time period usually begins at the time of diagnosis or at the start of treatment and ends at the time of death. Patients who died from causes other than the disease being studied are not counted in this measurement." 
Median survival, or "median overall survival" is also commonly used to express survival rates. This is the amount of time after which 50% of the patients have died and 50% have survived. In ongoing settings such as clinical trials, the median has the advantage that it can be calculated once 50% of subjects have reached the clinical endpoint of the trial, whereas calculation of an arithmetical mean can only be done after all subjects have reached the endpoint.
Five-year survival rate measures survival at 5 years after diagnosis.
Disease-free survival, progression-free survival, and metastasis-free survival
In cancer research, various types of survival rate can be relevant, depending on the cancer type and stage. These include the disease-free survival (DFS) (the period after curative treatment [disease eliminated] when no disease can be detected), the progression-free survival (PFS) (the period after treatment when disease [which could not be eliminated] remains stable, that is, does not progress), and the metastasis-free survival (MFS) or distant metastasis–free survival (DMFS) (the period until metastasis is detected). Progression can be categorized as local progression, regional progression, locoregional progression, and metastatic progression.
Proper interpretation of survival data of clinical cancer studies may be difficult and pitfalls related to the nature of Kaplan-Meier analyses might end up in mistaken inferences. While evaluating a randomized controlled trial, the authors of a method study came across some statistical issues that were apparently difficult to detect and that are possibly associated with misinterpreting survival functions.  These issues included assumed crossing of survival curves, statistical approach changed in follow-up, different pre-treatment between groups, and event-free survival used as primary outcome.
- Progression-free survival
- Response Evaluation Criteria in Solid Tumors (RECIST)
- Surveillance, Epidemiology, and End Results database (SEER)
- "NCI Dictionary of Cancer Terms". National Cancer Institute. 2011-02-02. Retrieved 2016-04-22.
- Definition : disease-specific survival rate
- "median overall survival". NCI Dictionary of Cancer Terms. National Cancere Institute. 2011-02-02. Retrieved 4 December 2014.
- Peinemann, Frank (2018). "Issues possibly associated with misinterpreting survival data: a method study". Journal of Evidence-Based Medicine. 11 (3): 208–215. doi:10.1111/jebm.12301. PMID 29877035.