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  • Title: Evaluation of adjuvant doxorubicin-based chemotherapy for the treatment of feline mammary carcinoma.
    Author: McNeill CJ, Sorenmo KU, Shofer FS, Gibeon L, Durham AC, Barber LG, Baez JL, Overley B.
    Journal: J Vet Intern Med; 2009; 23(1):123-9. PubMed ID: 19175730.
    Abstract:
    BACKGROUND: Feline mammary carcinomas (FMC) are locally invasive and highly metastatic tumors. Because of the high metastatic potential, patients often are treated with adjuvant doxorubicin-based chemotherapy, but little data exist to evaluate the effect of this strategy. HYPOTHESIS: Adjuvant doxorubicin-based chemotherapy improves outcome for FMC compared with surgery alone. ANIMALS: Cats with naturally occurring, biopsy-confirmed FMC treated with either surgery alone (Sx) or with surgery plus adjuvant doxorubicin-based chemotherapy (Sx + Chemo). METHODS: Retrospective cohort study. Clinical data were collected and compared to identify differences between groups. Outcome results were determined and compared. Prognostic factors for disease-free survival (DFS) and overall survival were evaluated. RESULTS: Seventy-three cats were evaluated, of which 37 were in the Sx group and 36 in the Sx + Chemo group. No differences in clinical data were found between Sx and Sx + Chemo groups. Median DFS times for the Sx and Sx + Chemo groups were 372 and 676 days, respectively (P= .15) and median survival times (ST) were 1,406 and 848 days, respectively (P= .78). For cats that underwent a unilateral radical mastectomy, ST was significantly longer for the Sx + Chemo compared with the Sx group (1,998 versus 414 days, respectively; P= .03). CONCLUSIONS AND CLINICAL IMPORTANCE: This study did not find a benefit to adjuvant doxorubicin-based chemotherapy in cats with FMC. Additional studies are required to determine whether patient subgroups with negative prognostic factors may benefit from adjuvant chemotherapy.
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