Instruments are needed to measure the influence of cancer on quality of life in the expanding population of long-term cancer survivors. We conducted refinement and psychometric evaluation of the Impact of Cancer (IOC) scale by use of data from a large sample of long-term breast cancer survivors and developed an instrument, the Impact of Cancer version 2 (IOCv2), to measure quality of life outcomes.
Division of Cancer Prevention and Control Research, UCLA School of Public Health and Jonsson Comprehensive Cancer Center, Los Angeles, CA 90095-6900, USA. ccrespi@ucla.edu