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Frequently asked questions

Survival

What is an all cancers net survival index and where is the data from?

Net survival in a population of cancer patients is their survival from the cancer of interest after adjustment for other causes of death. Presented here are one-year net survival rates by Clinical Commissioning Group (CCG) (all cancers combined) for people diagnosed with cancer in 2015. All first, primary and invasive malignancies were eligible for inclusion. Patients’ diagnosed non-melanoma skin cancers were excluded.

Cancer survival is influenced by:

  • the age people get cancer
  • the type of cancer they have
  • and stage at presentation.

To make a fair comparison of changes in survival over time and space, a survival index has been created that adjusts for the effect of changes over time in the profile of cancer patients by age, sex and type of cancer within each CCG. This means any changes in the survival index over time are due to changes in the outcomes of people with similar ages and cancer types. For more detail on the calculations please consult the source.

Cancer of the prostate was excluded from the index, because the widespread introduction of prostate-specific antigen (PSA) testing since the early 1990s has led to difficulty in the interpretation of survival trends.
More detail on prostate survival by the NCIN can be found on their website (accessed May 2014). 

Sources:

Office for National Statistics (ONS) in collaboration with Cancer Research UK Cancer Survival Group at the London School of Hygiene & Tropical Medicine. 2016.

One-year net survival for adults in England diagnosed between 2012 and 2014 and followed up to 2015.

ONS website link. (Accessed January 2018).