Lack of active follow-up of cancer patients in Chennai, India: implications for population-based survival estimates
Rajaraman Swaminathan, Ranganathan Rama, Viswanathan Shanta
Volume 86, Number 7, July 2008, 509-515
Table 4. Five-year absolute survival under different assumptions regarding survival status among incident cancer cases registered in 1990–1999 and followed through 2001, PBCR, Chennai, India
|Tumour site/type||5-year absolute survival (%)
|Case 1a||Case 2b||Case 3c||Case 4d|
|Leukaemia, type unspecified||32.9||17.8||10.9||6.2|
PBCR, population-based cancer registry.a Case 1: Passive follow-up only, with cancer cases not matched with those in the official mortality database presumed to be alive on the closing date.b Case 2: Passive and active follow-up, with cases lost to follow-up presumed to be alive on the closing date.c Case 3: Passive and active follow-up, with cases lost to follow-up censored on the last date their survival status was known.d Case 4: Passive and active follow-up, with cases lost to follow-up excluded from survival analysis.