SEER Inquiry System - Question 20200033 Details

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Produced: 06/21/2026 7:08 PM

Question 20200033

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Inquiry Details

References:

Solid Tumor Rules. Breast; July 2019 Update

Question:

Solid Tumor Rules (2018)/Multiple primaries--Breast: How many primary tumors should be abstracted for a 2018 breast excision with a final diagnosis of invasive mucinous adenocarcinoma (0.7 cm) with ductal carcinoma in situ (DCIS) present as discontinuous foci, spanning 12 cm? See Discussion.

Discussion:

If the term discontinuous foci means separate tumors, then rule M14 would apply making these multiple reportable tumors.

Answer:

Abstract two primaries, invasive mucinous and DCIS, using 2018 Solid Tumor Rules for Breast, M14, as the discontinuous foci are separate tumors in this example and the histologies are on different rows of Table 3 of the rules.

Cancer Site Category:

Breast

Data Item Category:

N/A

Other Category:

Multiple primaries, Solid Tumor Rules (2018, 2021)

Year:

2020