HER2 Negative Breast Cancer

Receptor discordance between primary tumors and nodal metastases is common, with most shifts occurring within the HER2-spectrum. There was a trend toward higher RS and ER or HER2-receptor discordance. HER2 discordance was also associated with larger tumor size and larger size of nodal metastasis. As strategies emerge to target HER2-low cohorts and to include ER-low/HER2-negative disease within treatment regimens for TNBC, it may become important to consider receptor testing of nodal disease in the future.

The dataset was validated through experiments using deep learning-based segmentation models. Therefore, this dataset is a clinically relevant and first publicly available resource for the development and evaluation of automated singular nuclei segmentation and HER2 grading methods in digital pathology.

P1/2, N=0, Withdrawn, Novartis Pharmaceuticals | N=217 --> 0 | Not yet recruiting --> Withdrawn

This study highlights PR-negativity in ER+/HER2- ILRR tumors as a poor prognostic factor after ILRR, independent of the PR status of the primary breast cancer, emphasizing the need for tailored treatment strategies.

The occurrence of BCLM is affected by age, tumor grade, other organ involvement, and molecular subtype. Survival was improved in BCLM patients with liver-only metastasis, HER2-positive subtype, or those who underwent hepatic resection. The number and molecular characteristics of liver metastasis are important prognostic predictors, and receptor conversion highlights the need for reassessment of therapeutic strategies during metastatic progression.

Ribociclib-induced vitiligo-like depigmentation is an under-recognized adverse effect. Early recognition and multidisciplinary management are key to optimizing oncologic care without compromising therapeutic benefit.

For more advanced BC, care costs rise substantially, mainly due to systemic therapies and hospital-based care. The HER status at cancer presentation significantly impacts care costs across all cancer stages.

The FROC model could help identify the low Ki67 expression (≤ 5%) and prevent unnecessary chemotherapy.

No statistically significant differences in ORR were detected according to prior CDK4/6 inhibitor exposure, number of prior treatment lines, or study design; however, these findings should be interpreted cautiously given the limited number of studies and substantial heterogeneity. Within a continuously evolving treatment landscape, further prospective studies are warranted to better define the optimal positioning of SG.

PD-L1 CN loss was associated with lower OS, particularly in HR(+) and HER2(-) patients. This result revealed the prognostic value of PD-L1 CNV in Indonesian advanced BC who received primary systemic therapy.

CDK4/6 inhibitor-based neoadjuvant therapy results in meaningful tumour downstaging and biological subtype modulation in HR+/HER2- breast cancer. The frequent conversion from Luminal B to Luminal A and the marked suppression of Ki-67 support the cytostatic, differentiation-driven mechanism of CDK4/6 inhibition. Although pCR rates remain modest compared with chemotherapy, the consistent biological and morphological responses highlight this approach as a lower-toxicity alternative or complement to chemotherapy in selected patients. Prospective studies incorporating proliferative dynamics and nodal outcomes are warranted.

 Switching CDK4/6i and ET conferred a statistically significant improvement of PFS in patients with progression or recurrence on prior CDK4/6i-containing therapy. These findings underscore the variability in survival outcomes based on post-CDK4/6i therapy choices in HR+/HER2- MBC, with promising evidence for rechallenging strategies.