Treatment (Set 1)
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(Reference: SEER Program Coding and Staging Manual 2004 (PDF), pgs 169-201 and Appendix C for Surgery of Primary Site codes; FORDS Manual (PDF), pgs 129-191 and Appendix B for Surgery of Primary Site codes.)
The first cancer-directed therapy (treatment given in an attempt to destroy or modify cancer tissue) was the partial mastectomy.
Partial mastectomy, NOS
Code the most extensive surgery if the patient has multiple surgical procedures of the primary site.
4 or more regional lymph nodes removed.
Surgery of the primary site was performed. (right breast partial mastectomy)