Perspectives in 2023

The current standard-of-care adjuvant treatment for patients with colorectal cancer is chemotherapy selected on the basis of conventional histopathological staging criteria; however, the clinical benefit from these regimens is limited. The authors of this Perspective discuss strategies to minimize toxicity and monitor efficacy of these regimens, and propose new tools for disease staging that could enable more personalized treatment decisions.

Despite some success in patients with certain B cell malignancies and relapsed and/or refractory multiple myeloma, studies testing chimeric antigen receptor (CAR) T cells in patients with advanced-stage solid tumours have been largely unsuccessful, with a few notable exceptions. In this Perspective, the author provides some possible reasons for the failures of most CAR T cell-based approaches and suggests strategies that might address some of these challenges.

The use of composite end points in clinical trials can expedite drug development and approval, and thus improve patient access to novel treatments, but are often vaguely and heterogeneously defined, with considerable inter-study variation in the component events that are included. The different component events can vary in clinical significance and be differentially affected by treatment but, nevertheless, are rarely reported separately. In this Perspective, Walia et al. define composite outcomes that are commonly used in oncology, discuss the advantages and challenges of using composite end points, and advocate for transparent reporting including a full breakdown of the component events to facilitate accurate interpretation of trial results and the true benefit of an intervention.

Despite improved effectiveness, most systemic cancer therapies are not curative and most patients will develop acquired resistance that often cannot be explained by the emergence of specific genomic alterations. In this Perspective, the authors describe the potential role of a small population of tumour cells, termed drug-tolerant persister cells, that are able to survive therapy and, on continued treatment exposure, develop stable mechanisms of resistance to systemic therapies.

The authors of this Perspective propose that, with further improvement in detection efficiency, circulating tumour cells (CTCs), which are released early during cancer development, have the potential to be used for the early detection of clinically relevant, aggressive cancers. Thus, use of CTCs as diagnostic biomarkers might improve outcomes by enabling the identification of cancers at a stage at which they are more amenable to treatment while avoiding overtreatment of patients with indolent tumours.