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Six months later, the primarytumor and axillaryly mph nodes showed progression. Subsequent treatment with eribulin was started, and partial response was obtained; however, new lymph node metastasis developed in the axilla after 11 cycles. The primary tumor and axillaryly mph nodes showed stronglypositive ER expression, were PgR-negative and HER2-positive, and showed Ki-67 low expression and HER2-positive conversion.Neuroendocrine carcinomas in the right-side colon are rare. We report a case of neuroendocrine carcinoma occurri