Oxaliplatin retreatment in metastatic colorectal cancer: Systematic review and future research opportunities

BACKGROUND

Oxaliplatin represents a main component of cytotoxic treatment regimens in colorectal cancer (CRC). Given its efficacy, oxaliplatin is frequently re-administered in the context of the continuum of care in metastatic CRC (mCRC). However, efficacy and tolerability of this therapeutic strategy has not been comprehensively assessed.

METHODS

We performed a systematic review of the literature on September 19th 2020, according to PRISMA criteria 2009. The research was performed on PubMed, ASCO Meeting Library, ESMO library and ClinicalTrials.gov for citations or ongoing trials.

RESULTS

64 records were retrieved and 13 included in the systematic review: 8 full-text articles, 4 abstracts and 1 ongoing clinical trial. According to readministration timing, studies were classified as rechallenge/reintroduction (n = 8) or stop & go/intermittent therapeutic strategies (n = 4). The studies presented wide heterogeneity in terms of efficacy (Response Rate 6-31%; Disease Control Rate 39-79%; median Progression-Free Survival 3.1-7 months). Those patients who received retreatment after prior adjuvant oxaliplatin or exploiting a stop-&-go strategy appeared to achieve better outcomes. However, no formal comparisons on treatment outcomes were feasible. The most frequent grade 3 or higher adverse events were hematologic toxicities (5-27%), peripheral neuropathy (5-14%) and hypersensitivity reactions (5-20%).

CONCLUSIONS

Retreatment with oxaliplatin for mCRC is practiced based on scarce and heterogeneous data indicating efficacy and manageable toxicity. The best strategy to exploit this approach remains to be defined, and the most promising research avenue to improve therapeutic index of oxaliplatin is represented by selection of responder patients whose tumors harbor molecular defects in the DNA damage repair pathway.

Ongoing 5-year+ survival after multiple metastasectomies, followed by CAPOX plus bevacizumab, for metastatic colorectal cancer

Background

Advancements in chemotherapy for metastatic colorectal cancer (mCRC) have improved long-term outcomes, and median survival currently exceeds 30 months. The recommended treatment for mCRC is multidisciplinary, including a combination of surgical resection and chemotherapy. In this study, we report the case of a patient who has survived for more than 5 years after an initial diagnosis of mCRC while undergoing first-line chemotherapy and six repeat metastasectomies.

Case presentation

A 55-year-old man was diagnosed at our hospital with sigmoid colon cancer and hepatic metastasis. We performed laparoscopic sigmoidectomy and hepatic segmentectomy (segment 5 [S5] and S8). After resecting the primary tumor and liver metastasis, other metastases were found. Together with perioperative chemotherapy (CAPOX + bevacizumab), we performed repeated metastasectomies for liver metastasis (S4 and S7), pulmonary S1 metastasis, aortic lymph node metastasis, and right adrenal metastasis. With six metastasectomies, the patient has survived for more than 5.5 years.

Conclusions

Multidisciplinary treatment extends survival and improves the quality of life in patients with mCRC. Planned surveillance after metastasectomy may also be necessary to promote the early detection of recurrence in these patients.