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#1: MP/H Rules
#2: Multiple primaries
Source 1: 2007 MP/H Rules
MP/H Rules/Multiple primaries--Bladder: Is recurrence of bladder cancer the same primary if the patient has had multiple recurrences each within 3 years of recurrences but 3 years has passed since initial diagnosis date?
Multiple bladder recurrences each within 3 years of recurrences and more than 3 years since initial diagnosis date would be a single primary. Use the date of the most recent occurrence when applying the bladder M rules. Do not use the initial diagnosis date for timing.