CONDITIONAL RELATIVE SURVIVAL OF CERVICAL CANCER: A KOREAN CENTRAL CANCER REGISTRY STUDY

Abstract

Introduction/Background Conditional relative survival (CRS) can complement the conventional 5-year relative survival that does not take into account the time the patient has survived after diagnosis. The purpose of this study was to evaluate the 5-year CRS and associated risk factors among Korean cervical cancer patients.

Methodology We identified 78,606 cervical cancer cases with a diagnosis between 1996 and 2015 in the Korea Central Cancer Registry. The CRS rates were calculated according to age, history, treatment method and stage at diagnosis.

Results The relative survival rate for five years was 80.6%, and for five years the CRS increased for the first two years and remained stable at 94.3% after five years of survival. Patients under the age of 40 had the highest level (88.9 percent) in five years, while those aged 70 or older had the worst CRS (55.0 percent) in five years. The localized disease had 91.9% CRS, local transferency had 72.3% CRS, and remote transitions were 27.0%.

Conclusion Patients with cervical cancer showed an increase in CRS rates, which varied with age, histology, and stage at diagnosis. The CRS analysis therefore provides a more detailed perspective on survival over the years after the initial diagnosis or treatment.