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Systemic Chemotherapy for High-Grade Mucinous Appendiceal Cancer with Peritoneal Spread After Unsuccessful CRS/HIPEC

  • Peritoneal Surface Malignancy
  • Published:
Annals of Surgical Oncology Aims and scope Submit manuscript

Abstract

Background

The best management of patients who have unresectable mucinous appendiceal cancer (MAC) with peritoneal spread after a failed attempt at cytoreductive surgery (CRS) with hyperthermic intraperitoneal chemotherapy (HIPEC) is unclear. This study aimed to assess outcomes after systemic chemotherapy (SCT) for patients with unresectable peritoneal metastases from high-grade MAC.

Methods

A single-center retrospective cohort study was conducted using a prospective CRS/HIPEC database. The study included high-grade MAC patients with peritoneal carcinomatosis who were deemed surgical candidates, but had an aborted CRS/HIPEC or only palliative HIPEC due to unresectable disease. Overall survival (OS) was compared.

Results

Of 72 identified patients, 20 received SCT and 52 did not (NoCT). The groups were balanced by age (p = 0.299), sex (p = 0.930), histopathologic subtype (p = 0.096), preoperative chemotherapy (p = 0.981), and postoperative major complication rates (p = 0.338). Both groups had extensive disease (median peritoneal cancer index at exploration, 39 vs 39). The median number of cycles was 12 (interquartile range [IQR], 6–15), and the median time between the procedure and SCT was 7 weeks (IQR, 5–10 weeks). The median follow-up period was 65 months. The median OS was significantly higher for the SCT group (26 months; 95 % confidence interval [CI], 10.8–41.5 months) than for the NoCT group (12 months; 95 % CI, 9.6–14.4 months) (p < 0.001), with hazard ratio (HR) of 0.22 (95 % CI, 0.08–0.66; p = 0.007) after adjustment for other factors.

Conclusion

Systemic chemotherapy is associated with improved OS for high-grade MAC patients with unresectable peritoneal metastases who are deemed surgical candidates but underwent an unsuccessful CRS/HIPEC attempt. Further prospective studies with a larger sample are required to identify patient subgroups who benefit the most from SCT.

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Correspondence to Armando Sardi MD, FACS.

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Baron, E., Sardi, A., King, M.C. et al. Systemic Chemotherapy for High-Grade Mucinous Appendiceal Cancer with Peritoneal Spread After Unsuccessful CRS/HIPEC. Ann Surg Oncol 29, 6581–6589 (2022). https://doi.org/10.1245/s10434-022-11894-6

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  • DOI: https://doi.org/10.1245/s10434-022-11894-6

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