Opinion Statement Navigating the complex landscape of breast cancer treatment involves distinct strategies for luminal and triple-negative subtypes. While neoadjuvant chemotherapy historically dominates the approach for aggressive triple-negative tumors, recent evidence highlights the transformative impact of immunotherapy, alongside chemotherapy, in reshaping treatment paradigms. In luminal cancers, endocrine therapy, notably aromatase inhibitors, demonstrates promising outcomes in postmenopausal patients with low-grade luminal A tumors. However, integrating targeted therapies like CDK4/6 inhibitors in neoadjuvant setting remains inconclusive. Identifying predictive factors for treatment response, especially in luminal tumors, poses a challenge, emphasizing the necessity for ongoing research. A multidisciplinary approach, tailored to individual patient profiles, is crucial for maximizing efficacy while minimizing toxicity. As we strive to optimize breast cancer management, a comprehensive understanding of the distinct characteristics and treatment implications of luminal and triple-negative subtypes, including the transformative role of immunotherapy, is essential for informed decision-making and personalized care.

ROS1 gene rearrangements define a distinct molecular subtype of non-small cell lung cancer (NSCLC), occurring in approximately 2% of cases and frequently associated with younger age, non-smoker status, and a high incidence of brain metastases. The discovery of ROS1 as an oncogenic driver has led to the development of targeted tyrosine kinase inhibitors (TKIs). Crizotinib first demonstrated substantial clinical benefit, but its limitations, including poor central nervous system (CNS) penetration and acquired resistance, highlighted the need for next-generation inhibitors. Several agents have since been developed, including entrectinib, lorlatinib, repotrectinib, taletrectinib, and zidesamtinib, each offering improved intracranial (IC) activity and efficacy against resistance mutations, notably ROS1^G2032R. Despite these advances, optimal sequencing strategies remain undefined, and resistance ultimately emerges in most patients. This review provides an updated overview of ROS1 biology, diagnostic approaches, clinical outcomes with currently available TKIs, mechanisms of resistance, and ongoing challenges, emphasizing the rapidly evolving therapeutic landscape.

Opinion Statement This perspective underscores the evolution and significance of neoadjuvant therapy in breast cancer, tracing its history and efficacy in improving outcomes. It delves into the correlation between achieving complete response and long-term survival, emphasizing the predictive value of treatment response estimation. Neoadjuvant chemotherapy in HER2-positive early breast cancer, particularly with taxanes and anti-HER2 therapies, emerges as a cornerstone, offering enhanced breast conservation rates and prognostic insights. The focus on individualized care, tailored to treatment response, underscores the need for adaptive strategies. Additionally, the article discusses the ongoing debate surrounding anthracyclines' role and the benefits of dual HER2 blockade. Ultimately, advocating for a personalized approach, guided by treatment response assessment, ensures optimal outcomes in HER2-positive breast cancer management.

Background: Rearrangements of the ALK gene are rare in medullary thyroid carcinoma (MTC), with limited data on the efficacy of ALK inhibitors in this context. Novel fusions, such as SPECC1L::ALK, have not been extensively studied. Methods: We present a case of a 33-year-old woman with metastatic MTC, in whom molecular profiling using next-generation sequencing (Archer FusionPlex®) identified a SPECC1L::ALK gene fusion. Treatment with the ALK inhibitor alectinib was initiated at 600 mg twice daily. Results: The patient demonstrated a dramatic partial to near-complete response after 6 days of treatment, as shown by positron emission tomography-computed tomography. At 6 weeks, a complete response was confirmed. Treatment was generally well tolerated, aside from grade 3 myalgia with elevated creatine phosphokinase, managed with temporary cessation and dose adjustment. As of the latest follow-up (8 months), the patient remains on alectinib with sustained complete response. Conclusions: This is the first report of a SPECC1L::ALK fusion in MTC. The dramatic response to alectinib highlights the importance of molecular profiling and suggests that ALK inhibitors may benefit patients with rare ALK fusions in thyroid cancers.

HR +/HER2 + breast cancer (BC) represents a unique clinical entity distinct from HR-/HER2 + BC, with specific molecular characteristics and resistance mechanisms. The interaction between estrogen receptor (ER) and HER2 signaling pathways promotes tumor growth and therapeutic resistance, highlighting the need for tailored approaches. This review focuses on the clinical and molecular features of HR + /HER2 + metastatic BC, with an emphasis on recent data exploring the integration of CDK4/6 inhibitors (CDK4/6i) into anti-HER2 therapeutic strategies. Key findings from metastatic trials are summarized. HR + /HER2 + metastatic BC is characterized by a predominance of luminal molecular subtypes, associated with distinct patterns of metastatic spread and prolonged progression-free survival compared to nonluminal subtypes. Despite the efficacy of dual HER2 blockade, resistance remains a challenge, driven by crosstalk between ER and HER2 pathways. CDK4/6i disrupt the cell cycle at the G1/S checkpoint and have shown promise in overcoming resistance, inducing sustained senescence, and improving outcomes in luminal subtypes. Recent trials suggest that CDK4/6i may play a key role in maintenance therapy and chemotherapy-free regimens for selected patients with HR + /HER2 + metastatic BC. The integration of CDK4/6 inhibitors into anti-HER2 treatment strategies represents a promising approach to address the unique biology of HR + /HER2 + BC. Molecular profiling and personalized treatment strategies are essential to optimize patient outcomes and reduce unnecessary toxicity.