Alternate Name	Item#	Length	Source of Standard	Column #
	446	2	SEER	589-590

Description
This data item is used to count the number of tumors (multiplicity) that are reported as a single primary, when present at the time of diagnosis or occurring later.

Rationale
Patients with multiple tumors reported as a single primary for surveillance purposes may have a worse prognosis or more extensive treatment than patients with a single tumor. This data item will make it possible to identify important information about these cases for data analysis.

Codes (refer to http://seer.cancer.gov/tools/mphrules/index.html for additional instructions).

00	No primary tumor identified
01	One tumor only
02	Two tumors present; bilateral ovaires involved with cystic carcinoma
03	Three tumors present
..
..
88	Information on multiple tumors not collected/not applicable for this site
89	Multicentric, multifocal, number unknown
99	Unknown if multiple tumors; not documented
Blank	Information not collected for this diagnosis date (e.g., all cases diagnosed prior to 2007)

Note: Codes 00 and 89 were added effective for 2011.