Understanding EOD Changes and Guidelines in Cancer Staging

EOD, developed by NCI-SEER, was a key tool in cancer staging from 1977 to 2003, capturing tumor size, extension, and lymph node involvement. The transition to Collaborative Stage in 2004 brought changes, with SEER EOD serving as an epidemiological tool. This summary covers EOD timing rules, general guidelines, and schema-specific instructions for coding primary tumors, lymph nodes, and metastases.

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