Merkel Cell Carcinoma of Skin, Vulva, Penis, Scrotum

Primary Site	Histology
C000-C006, C008-C009, C440-C449, C510-C512, C518-C519, C600-C602, C608-C609, C632, C809	8041, 8190, 8247

Notes

8041, 8190, 8247 (C000-C006, C008-C009, C440-C449, C510-C512, C518-C519, C600-C602, C608-C609, C632, C809) **Note 1:** The following sources were used in the development of this schema * SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998) (https://seer.cancer.gov/archive/manuals/EOD10Dig.3rd.pdf) * SEER Summary Staging Manual-2000: Codes and Coding Instructions (https://seer.cancer.gov/tools/ssm/) * Collaborative Stage Data Collection System, version 02.05: https://cancerstaging.org/cstage/Pages/default.aspx * Chapter 46 *Merkel Cell Carcinoma*, in the AJCC Cancer Staging Manual, Eighth Edition (2017) published by Springer International Publishing. Used with permission of the American College of Surgeons, Chicago, Illinois. **Note 2:** Merkel cell carcinoma presenting in nodal or visceral site with primary site unknown is coded to C449, Skin, NOS.

Data Items
Staging Methods
Outputs

Data Items

Name	Default Value	Used in Derivation	NAACCR Item	Required By	Metadata
Year of Diagnosis		No	NAACCR #390		None
Primary Site		Yes	NAACCR #400		None
Histology		Yes	NAACCR #522		None
Behavior		No	NAACCR #523		None
Tumor Size Clinical		No	NAACCR #752		None
Tumor Size Pathological		No	NAACCR #754		None
Tumor Size Summary	999	Yes	NAACCR #756		None
Regional Nodes Positive	99	No	NAACCR #820		None
Regional Nodes Examined	99	No	NAACCR #830		None
RX Summ Surgery/Radiation Sequence		No	NAACCR #1380		None
RX Summ Systemic/Surgery Sequence		No	NAACCR #1639		None
EOD Primary Tumor	999	Yes	NAACCR #772		None
EOD Regional Nodes	999	Yes	NAACCR #774		None
EOD Mets	00	Yes	NAACCR #776		None
SS2018		No	NAACCR #764		None
Grade Clinical	9	No	NAACCR #3843	CCCR/Canada COC NPCR SEER	SSDI
Grade Pathological	9	No	NAACCR #3844	CCCR/Canada COC NPCR SEER	SSDI
Grade Post Therapy		No	NAACCR #3845	CCCR/Canada COC NPCR SEER	SSDI
Lymph Nodes Isolated Tumor Cells	8	No	NAACCR #3880	COC SEER	SSDI
Profound Immune Suppression	8	No	NAACCR #3918	COC SEER	SSDI
Extranodal Extension Clinical	8	No	NAACCR #3830	COC SEER	SSDI
Extranodal Extension Pathological	8	No	NAACCR #3833	COC SEER	SSDI

Initial Context

Staging Methods

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Summary Stage 2018

Start

Additional Context

eod_2018_t = 90

eod_2018_m = 90

eod_2018_n = 90

Next Step

EOD Mets
EOD Mets
ss2018_m

Next Step

End

Outputs

Name	Default Value	NAACCR Item	Metadata
Schema ID	00460	NAACCR #3800 None	None
Derived Version	{{ctx_alg_version}}	None	None
Derived Summary Stage 2018	9	NAACCR #762 None	None

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EOD Data v1.1