Evidence-based appraisal of the upfront treatment for unresectable metastatic colorectal cancer patients

The effect of prognostic factors at baseline on the efficacy of trifluridine/tipiracil in patients with metastatic colorectal cancer: A Portuguese exploratory analysis

BACKGROUND

The RECOURSE trial supported trifluridine/tipiracil as a treatment option in metastatic colorectal cancer (mCRC). Subsequent analysis demonstrated that low tumour burden and indolent disease are good prognosis factors improving progression-free survival (PFS) and overall survival (OS). This study aimed to evaluate the impact of prognosis group in the OS, PFS and safety of trifluridine/tipiracil in patients with mCRC.

METHODS

Single-centre, retrospective, and observational study of patients with mCRC who started trifluridine/tipiracil between February 2018 and July 2019. Patients were divided into good prognosis characteristics (GPC) [low tumour burden (less than 3 metastasis site) and indolent disease (≥18 months from first metastasis diagnosis)] and poor prognostic characteristics (PPC) group [high tumour burden (3 or more metastasis sites) and/or aggressive disease (<18 months since the first metastasis diagnosis)].

RESULTS

Median age was 67 years (48-82), 67.3% of the patients were male, and 65.3% had stage IV disease at baseline. Overall, median OS was 7.5 months (95%CI:5.7-9.3). Twenty-two patients (44.9%) presented GPC and 29 (59.1%) had PPC. GPC patients had longer median OS [11.4 (95%CI:6.2-16.7)] versus 3.9 months [(95%CI: 3.3-4.6),p < 0.0001] and PFS [4.9 (95%CI:3.0-6.9) versus 2.6 months (95%CI:2.2-2.8),p < 0.0001]. These differences were more pronounced in GPC patients with no liver metastasis. Grade ≥3 adverse events incidence didn't vary between GPC and PPC subgroups.

CONCLUSION

Our study validates the improved trifluridine/tipiracil efficacy in patients with GPC in comparison with PPC while maintaining a well-tolerated safety profile. Indolent disease, low tumour burden and the absence of liver metastasis were shown to be good prognosis factors influencing sustained response to trifluridine/tipiracil.

Personalized medicine: Stem cells in colorectal cancer treatment

Treatment failure in primary as well as metastatic cancer patients, caused by chemo and radioresistance, has reinforced the research for the applicability of personalized medicine. The use of stem cells (SCs) and cancer stem cells (CSCs) in such a treatment approach will be reviewed in this study. Colorectal cancer (CRC) SCs prove to be a promising asset for CRC treatment optimization both by serving as biomarkers for the current therapy modalities, by means of treatment personalization and patient/tumor stratification, as well as in the development of targeted therapies, selective for the stem cell population. Similar conclusions are drawn, regarding mesenchymal stromal cells (MSCs) and their effect in CRC therapy; while resident stromal cells (RSCs) of tumor microenvironment (TME) seem to promote the tumorigenic and metastatic processes in addition to conferring to the chemo- and radioresistance, under certain conditions they are able to improve the treatment outcome of CRC chemotherapy, e.g. by targeted enzyme/prodrug treatment of CRC cells. This review, points out the dynamic potential of CSCs and other SCs types in CRC treatment personalization as well as, in the improvement of current treatment approaches, opting to a higher therapeutic rate, improved prognosis, survival and quality of life for CRC patients.

Timing and extent of response in colorectal cancer: critical review of current data and implication for future trials

The identification of new surrogate endpoints for advanced colorectal cancer is becoming crucial and, along with drug development, it represents a research field increasingly studied. Although overall survival (OS) remains the strongest trial endpoint available, it requires larger sample size and longer periods of time for an event to happen. Surrogate endpoints such as progression free survival (PFS) or response rate (RR) may overcome these issues but, as such, they need to be prospectively validated before replacing the real endpoints; moreover, they often bear many other limitations. In this narrative review we initially discuss the role of time-to-event endpoints, objective response and response rate as surrogates of OS in the advanced colorectal cancer setting, discussing also how such measures are influenced by the tumor assessment criteria currently employed. We then report recent data published about early tumor shrinkage and deepness of response, which have recently emerged as novel potential endpoint surrogates, discussing their strengths and weaknesses and providing a critical comment. Despite being very compelling, the role of such novel response measures is yet to be confirmed and their surrogacy with OS still needs to be further investigated within larger and well-designed trials.

Treatment-related gastrointestinal toxicities and advanced colorectal or pancreatic cancer: A critical update

Gastrointestinal toxicities (GIT), including oral mucositis, nausea and vomiting, and diarrhea, are common side effects of chemotherapy and targeted agents in patients with advanced colorectal cancer and pancreatic cancer. Being often underreported, it is still difficult to precisely establish their burden in terms of both patient’s quality of life and cancer care costs. Moreover, with the use of more intensive upfront combination regimens, the frequency of these toxicities is rapidly growing with a potential negative effect also on patient’s outcome, as a result of dose reductions, delays or even discontinuation of active treatments. Thus, identifying patients at higher risk of developing GIT as well as an optimal management are paramount in order to improve patient’s compliance and outcome. After the description of the main treatment-induced GIT, we discuss the current knowledge on the pathophysiology of these side effects and comment the scales commonly used to assess and grade them. We then provide a critical update on GIT incidence based on the results of key randomized trials conducted in patients with metastatic colorectal cancer and advanced pancreatic cancer.

Perspectives from American Society of Clinical Oncology: translational and clinical research highlights in breast and colorectal cancers

2014 ASCO Annual Meeting, Chicago, IL, USA, 28 May-3 June 2014. Advances in translational and clinical research have improved our understanding of breast and colorectal cancers, and have enabled remarkable progress in their treatment. These advances continue to be of paramount importance for breast and colorectal cancers. This report will describe and comment on the key messages from selected abstracts presented at the 50th American Society of Medical Oncology annual meeting that will impact clinical practice in the near future.

Tracking the 2015 Gastrointestinal Cancers Symposium: bridging cancer biology to clinical gastrointestinal oncology

The 2015 Gastrointestinal Cancers Symposium (San Francisco, CA, USA; January 15-17) is the world-class conference co-sponsored by the American Society of Clinical Oncology, the American Society for Radiation Oncology, the American Gastroenterological Association Institute, and the Society of Surgical Oncology, in which the most innovative research results in digestive tract oncology are presented and discussed. In its twelfth edition, the meeting has provided new insights focusing on the underpinning biology and clinical management of gastrointestinal malignancies. More than 3,400 health care professionals gathered from all over the world to share their experiences on how to bridge the recent novelties in cancer biology with everyday medical practice. In this article, the authors report on the most significant advances, didactically moving on three different anatomic tracks: gastroesophageal malignancies, pancreatic and biliary cancers, and colorectal adenocarcinomas.