Browse Articles

Myeloid-derived suppressor cells (MDSCs) are a heterogeneous population of myeloid cells that accumulate in the tumour microenvironment, where they exert various immunosuppressive mechanisms as well as a variety of other tumour-promoting effects. Herein, the authors provide an overview of MDSC generation and their accumulation in tumours, describe the interplay between MDSCs and various other cell types found in tumours, and review the mechanisms by which MDSCs promote tumour development and progression, metastasis, and resistance to treatment. They also discuss the effects of established treatment modalities on MDSCs as well as implications for the development of novel therapeutic strategies targeting these cells.

The discovery of ERBB2 as a gene frequently amplified and/or overexpressed in breast cancers and of its product HER2 as a biomarker has spurred the development of various targeted therapies. As a result, the prognosis of patients with advanced-stage HER2-positive breast cancer has greatly improved in the past decades. The authors of this Review describe the development of the current treatment landscape for these patients and discuss how to address resistance to further improve outcomes.

The FDA approval of perioperative pembrolizumab, an approach that combines neoadjuvant and adjuvant therapy with this agent, for patients with early stage non-small-cell lung cancer (NSCLC) contradicts its own stated standard for combination therapies. Given the large population of patients with early stage NSCLC and the high costs of pembrolizumab, whether the adjuvant component provides incremental benefit is an important question.

Through Project Optimus, the FDA calls for radical changes in the design of early phase trials to identify the optimal doses of oncology drugs to achieve maximal efficacy with better tolerability and patient acceptability. Herein, we discuss approaches that will enable the implementation of this initiative as well as some concerns that the draft guidance has raised in the oncology community.

Recent results from the phase III PHILA trial demonstrate a benefit in terms of progression-free survival derived from the addition of pyrotinib to first-line chemotherapy plus trastuzumab in patients with metastatic HER2-positive breast cancer. Dual HER2 blockade with pyrotinib and trastuzumab is an effective therapeutic strategy but might increase the risk of gastrointestinal toxicity; therefore, the risk-to-benefit ratio should be carefully evaluated.

p53, encoded by TP53, the commonest mutated gene in cancer, is an appealing target for systemic anticancer therapies including those designed to restore p53 function. Thus far, and despite promising preclinical data and several clinical trials, no p53-restoring systemic therapy has been approved for therapeutic use. Despite this limited success, several research efforts are ongoing. In this Review, the authors summarize the role of p53 in cancer with a focus on the complexity of p53 function and how this relates to clinical attempts to restore at least some of these functions.

Cyclin-dependent kinase (CDK) 4/6 inhibitors in combination with endocrine therapy have become the standard-of-care therapy for patients with advanced-stage hormone receptor-positive breast cancer. However, this success has created several challenges, such as the need to better understand resistance to these agents and develop novel therapies accordingly. Here, the authors provide an update on the clinical activity of the established CDK4/6 inhibitors along with a summary of ongoing research efforts attempting to address the new challenges created by the success of these agents.

Recent results from the FLAURA2 and MARIPOSA-2 trials underline the continued role of chemotherapy in the treatment of patients with EGFR-mutated non-small-cell lung cancer in the era of targeted therapies. Herein, we argue that the most appropriate and rational sequence and/or combination of therapies remains a matter of discussion.

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.

Neoadjuvant cisplatin-based combination chemotherapy followed by radical cystectomy with pelvic lymphadenectomy is the current standard therapy for cisplatin-eligible patients with muscle-invasive bladder cancer (MIBC). A phase II trial testing treatment intensification by adding the immune-checkpoint inhibitor nivolumab to chemotherapy has yielded promising complete response rates, which suggests that bladder-preserving treatment could become attainable in selected patients. This trial heralds a new era in demonstrating the feasibility of bladder preservation for selected patients with MIBC.

Patients with advanced-stage urothelial cancer (aUC) continue to have poor long-term survival outcomes. However, developments in the past 5 years, most notably the availability of maintenance therapy with the anti-PD-1 antibody avelumab, are beginning to change this issue. In this Review, the authors provide an overview of the treatment of patients with aUC, including considerations of the various promising new therapeutic modalities and how they might improve clinical outcomes.