Leading cancers--changes in five-year relative survival.
OBJECTIVE
Changes in five-year relative survival ratios for prostate, breast, colorectal and lung cancer cases are examined. Ratios for cases diagnosed in the 1985-1987 period are compared with those for 1992-1994. Incidence and mortality rates between 1985 and 1999 are compared with changes in relative survival.


METHODS
Data are from the Canadian Cancer Registry, the National Cancer Incidence Reporting System, the Canadian Mortality Data Base, and life tables.


METHODS
Analysis was conducted using the maximum likelihood method of Esteve. Age-standardized ratios for a given cancer were calculated by weighting age-specific ratios to the age distribution of patients diagnosed with that cancer. Statistical tests were used to compare corresponding age-specific and age-standardized ratios across the two periods. National estimates exclude Québec and New Brunswick.


RESULTS
Between the 1985-1987 period and the 1992-1994 period, increases in five-year age-standardized relative survival ratios were dramatic for prostate cancer, large for breast cancer, and somewhat smaller for colorectal cancer. There was little absolute change in the ratios for lung cancer.
Ellison
Larry F
LF
Health Statistics Division at Statistics Canada, Ottawa, Ontario, K1A 0T6. Larry.Ellison@statcan.ca
Gibbons
Laurie
L
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000401:mortality*; D002170:Canada / Q000453:epidemiology; D015179:Colorectal Neoplasms / Q000401:mortality*; D005260:Female; D006801:Humans; D015994:Incidence; D015993:Life Tables; D016013:Likelihood Functions; D008175:Lung Neoplasms / Q000401:mortality*; D008297:Male; D008875:Middle Aged; D011471:Prostatic Neoplasms / Q000401:mortality*; D012042:Registries; D015996:Survival Rate