Clinical Trials for Ductal Carcinoma In Situ of the Breast

Decisions to decline breast screening and/or breast cancer treatment based on the potential harms of overdiagnosis and overtreatment: a qualitative study

OBJECTIVES

To explore the experiences of women who have made the decision to decline breast screening and/or breast cancer treatment for overdiagnosis/overtreatment reasons after being invited to the National Health Service Breast Screening Programme (NHS BSP).

DESIGN

Qualitative interview study using reflexive thematic analysis.

SETTING

Participants were recruited via social media, online forums and word of mouth. Semi-structured interviews were conducted between May 2021 and April 2022.

PARTICIPANTS

20 women aged between 49 and 76 years old who had declined one or more of the following after receiving an invitation to participate in the NHS BSP: (1) screening investigation, that is, mammogram; (2) further investigations, for example, biopsy, ultrasound; (3) treatment, for example, mastectomy, chemotherapy, radiotherapy and (4) any other medical intervention, for example, ongoing medication.

RESULTS

The three main themes were as follows: (1) the perception that the NHS BSP information was biased towards uptake and so constrained choice; (2) taking an active role in decision-making by considering the benefits and harms of the NHS BSP and (3) navigating potential regret for having declined.

CONCLUSIONS

In-depth understanding of the potential harms of overdiagnosis and overtreatment influenced the decision to decline for these participants and contributed to their dissatisfactions with the way that information was presented in the invitation to the NHS BSP and the women felt confident in their assessments of the benefits and harms. These findings differ from previous studies, which have suggested that the vast majority lack knowledge and understanding of what overdiagnosis and overtreatment are whereas the participants in this study demonstrated high levels of health literacy. Findings have implications for the way informed choice is considered and constructed in relation to the NHS BSP.

Human Ductal Carcinoma In Situ: Advances and Future Perspectives

Due to widespread adoption of screening mammography, there has been a significant increase in new diagnoses of ductal carcinoma in situ (DCIS). However, DCIS outcomes remain unclear. A large fraction of human DCIS (>50%) may not need the multimodality treatment options currently offered to all DCIS patients. More importantly, while we may be overtreating many, we cannot identify those most at risk of invasion or metastasis following a DCIS diagnosis. This review summarizes the studies that have furthered our understanding of DCIS pathology and mechanisms of invasive progression by using advanced technologies including spatial genomics, transcriptomics, and multiplex proteomics. This review also highlights a need for rethinking DCIS with a more focused view on epithelial states and programs and their cross talk with the microenvironment.

Towards the development of DCIS risk prediction models

Ductal carcinoma in situ (DCIS) has a variable natural history, with a poorly understood biology. In this issue of Cancer Cell, Strand et. al. use two well-annotated DCIS repositories to identify an 812-gene classifier that associates with high risk of DCIS recurrence and define novel DCIS subtypes that informs future studies.

Single-cell evaluation reveals shifts in the tumor-immune niches that shape and maintain aggressive lesions in the breast

There is an unmet clinical need for stratification of breast lesions as indolent or aggressive to tailor treatment. Here, single-cell transcriptomics and multiparametric imaging applied to a mouse model of breast cancer reveals that the aggressive tumor niche is characterized by an expanded basal-like population, specialization of tumor subpopulations, and mixed-lineage tumor cells potentially serving as a transition state between luminal and basal phenotypes. Despite vast tumor cell-intrinsic differences, aggressive and indolent tumor cells are functionally indistinguishable once isolated from their local niche, suggesting a role for non-tumor collaborators in determining aggressiveness. Aggressive lesions harbor fewer total but more suppressed-like T cells, and elevated tumor-promoting neutrophils and IL-17 signaling, disruption of which increase tumor latency and reduce the number of aggressive lesions. Our study provides insight into tumor-immune features distinguishing indolent from aggressive lesions, identifies heterogeneous populations comprising these lesions, and supports a role for IL-17 signaling in aggressive progression.

The management of women with ductal carcinoma in situ of the breast in Australia and New Zealand between 2007 and 2016

BACKGROUND

The incidence of detected ductal carcinoma in situ (DCIS) continues to increase and now accounts for 14% of all breast cancer, and 20%-25% of screen-detected cases. Treatment trends of DCIS are important in order to inform the ongoing debate about possible overdiagnosis and overtreatment, but have not been investigated for over a decade in Australia and New Zealand. Against this background, we aimed to describe the temporal trends in management of DCIS in Australian and New Zealander women.

METHODS

Using the BreastSurgANZ Quality Audit (BQA) database, we conducted a descriptive study of the trends of management of DCIS in Australia and New Zealand from 2007 to 2016. We assessed the frequency of surgical treatments, adjuvant therapies, and axillary surgery conducted in women with pure DCIS.

RESULTS

There were 17 883 cases of pure DCIS in 2007-2016 in Australia and New Zealand recorded in the BQA database. The treatment patterns were consistent with no changes over time. The most common surgical treatment was breast-conserving surgery (66%), followed by mastectomy (37%), and 36% of women with DCIS received sentinel node biopsy (SNB).

CONCLUSION

The clinical management of women diagnosed with DCIS in Australia and New Zealand, appears stable over time. A substantial proportion of women with DCIS receive SNB and this aspect of surgical care warrants further exploration to determine whether it represents appropriate care. These results, alongside the outcomes of the ongoing clinical trials on the management of DCIS, will help inform if any changes to best practice treatment are required.

Low-Grade Ductal Carcinoma In Situ

OBJECTIVES

We aimed to determine the interobserver reproducibility in diagnosing low-grade ductal carcinoma in situ (DCIS). We also aimed to compare the interobserver variability using a proposed two-tiered grading system as opposed to the current three-tiered system.

METHODS

Three expert breast pathologists and one junior pathologist identified low-grade DCIS from a set of 300 DCIS slides. Months later, participants were asked to grade the 300 cases using the standard three-tiered system.

RESULTS

Using the two-tiered system, interobserver agreement among breast pathologists was considered moderate (κ = 0.575). The agreement was similar (κ = 0.532) with the junior pathologist included. Using the three-tiered system, pathologists' agreement was poor (κ = 0.235).

CONCLUSIONS

Pathologists' reproducibility on diagnosing low-grade DCIS showed moderate agreement. Experience does not seem to influence reproducibility. Our proposed two-tiered system of low vs nonlow grade, where the intermediate grade is grouped in the nonlow category has shown improved concordance.

Old Receptor, New Tricks-The Ever-Expanding Universe of Aryl Hydrocarbon Receptor Functions. Report from the 4th AHR Meeting, 29⁻31 August 2018 in Paris, France

In a time where "translational" science has become a mantra in the biomedical field, it is reassuring when years of research into a biological phenomenon suddenly points towards novel prevention or therapeutic approaches to disease, thereby demonstrating once again that basic science and translational science are intimately linked. The studies on the aryl hydrocarbon receptor (AHR) discussed here provide a perfect example of how years of basic toxicological research on a molecule, whose normal physiological function remained a mystery for so long, has now yielded a treasure trove of actionable information on the development of targeted therapeutics. Examples are autoimmunity, metabolic imbalance, inflammatory skin and gastro-intestinal diseases, cancer, development and perhaps ageing. Indeed, the AHR field no longer asks, "What does this receptor do in the absence of xenobiotics?" It now asks, "What doesn't this receptor do?".