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Survival time was measured as the last follow-up date minus the operation date for living patients and the date of death minus the operation date for deceased patients.
The overall survival was measured from the operation date to the date of death or the final followup.
The Ports Operation segment includes container terminal operation, bulk and general cargo terminal operations.
Survival was determined based on operation date.
Information on operation (date, side, type), reoperation (date, side, type), and date of death was recorded.
Before the operation, all patients followed the same patient pathway from out patient appointment to operation date.
For the remaining 7 patients, the diagnosis date was after the (elective) operation date, so that a relationship between diagnosis and operation could not be assumed.
Overall survival (OS) was calculated from operation date of lymph node dissection to date of death due to any cause.
The uPAR staining was not correlated with operation date (not shown).
Verification of the source was not performed for Primary Operation Date and Surgical Unit Description fields.
Survival was calculated from the operation date until 1 April 2009 when any remaining survivors were censored.
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