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SEER Inquiry System - Report
Produced: 11/22/2024 6:58 AM
Question 20210022
Inquiry Details
References:
#1: Solid Tumor Rules. Other Sites; for cases diagnosed 2007-2021
#2: WHO Class Urinary System and Male Genital Organs. 4th edition
Question:
Solid Tumor Rules (2018/2021)/Multiple primaries--Prostate: Is basal cell carcinoma with focal squamous differentiation and a small focus of infiltrating prostatic adenocarcinoma one or two primaries and if one, is the histology 8147/3? See Discussion.
Discussion:
Scenario: Patient had a transurethral resection of the prostate on 8-29-19, positive for basal cell carcinoma with focal squamous differentiation involving approximately 50% of tissue (determined not to be mets by consult). On 11-14-19, the patient had a prostatectomy positive for residual basal cell carcinoma and a small focus of infiltrating prostatic adenocarcinoma. According to AJCC, 8th edition, page 724, basal cell carcinoma of the prostate is 8147/3 and we ignored the small focus of adenocarcinoma. The above scenario was reported as two primaries (8090/3 and 8140/3), but we are thinking it is one.
Answer:
Abstract a single primary and code as 8147/3 using Rule M18 and Rule H17 of the 2018 Other Sites Solid Tumor Rules. This is based on the findings of basal cell carcinoma of the prostate (8147/3) and adenocarcinoma (8140/3). We consulted with the Subject Matter Expert who advises that basal cell carcinoma and basal cell adenocarcinoma can be used interchangeably.
This updates previous consultation regarding this histology. The Other Sites rules will be updated for 2022 and include this information in the prostate histology table.
