Introduction: Mastectomy is a surgical procedure for the treatment or prevention of breast cancer, involving the removal of breast tissue, skin, and the nipple-areola complex. It includes simple and radical modalities, with the radical type characterized by axillary lymph node dissection in cases of lymphatic involvement. Objectives: To analyze the temporal trend of simple and radical mastectomy procedures with axillary lymphadenectomy in the Northern Region of Brazil between 2020 and 2024. Methods: This is an epidemiological, descriptive, and quantitative study, using data from the Hospital Information System of the Brazilian Unified Health System (SIH-SUS), available on DATASUS. Procedures of simple and radical mastectomy with axillary lymphadenectomy in oncology were analyzed in the Northern Region from 2020 to 2024, considering year of hospitalization, average length of stay, and average hospitalization cost. Results: Between 2020 and 2024, there were 2,923 hospitalizations for mastectomies in the Northern Region, with 2,503 (85.6%) being radical procedures. The distribution was uneven, with concentrations in Amazonas (38.4%) and Pará (34.3%), while Amapá accounted for only 1.1%. For simple mastectomies, Amazonas (28.1%) and Tocantins (24.0%) led, whereas Roraima (4.0%) and Amapá (2.6%) had the lowest percentages. The average hospital stay for radical mastectomies was 3.0 days, ranging from 1.8 days in Roraima (40% below average) to 4.3 days in Pará (43% above average). For simple mastectomies, there was a 35.5% reduction from 3.1 days in 2020 to 2.0 days in 2024, with Tocantins at 1.2 days and Pará at 3.9 days. The average cost of hospitalization for radical mastectomy was R$ 3,280.43, with Pará showing the highest cost (R$ 3,748.15; 14.3% above average) and Amapá the lowest (R$ 2,532.65; 22.8% below average). For simple mastectomies, the average cost was R$ 2,581.79, with Pará again having the highest cost (R$ 3,183.00; 23.3% above average) and Acre (R$ 2,076.59; 19.6% below) and Amapá (R$ 2,116.58; 18% below) the lowest. Conclusion: The study showed a predominance of radical mastectomies in the Northern Region, suggesting high case severity and failures in early diagnosis. The concentration of procedures in Amazonas and Pará may reflect higher population density and the presence of referral centers, in addition to potential shortcomings in primary care and breast cancer screening. Conversely, Amapá and Roraima recorded low surgery numbers, indicating underreporting, patient migration, or limited access to oncological surgery and infrastructure. The average hospital stay of 3.0 days masked important variations, such as shorter stays in Roraima—possibly linked to early discharge protocols—and longer stays in Pará, suggesting greater case complexity. The 35.5% reduction in hospital stay for simple mastectomies suggests service optimization, although state disparities point to differences in structure and postoperative care. In terms of costs, radical mastectomies were more expensive, with Pará showing the highest values for both types, reflecting care complexity, infrastructure, and differences in hospital financing models.
It is with great enthusiasm that we present the Annals of the Oncology International Symposium 2025, an event that continues to solidify its significance in the oncology landscape of northern Brazil. Held in Belém, Pará, Oncology 2025 centered around the theme "The cancer control challenge: better knowing it to best facing it," dedicating itself to exploring the latest frontiers in cancer treatment and prevention.
This year, the symposium provided a deep dive into the essential role of knowledge in the fight against cancer, presenting new perspectives and scientific advancements across various areas of oncology. Renowned global experts gathered to share their most recent research and innovative approaches, offering participants a comprehensive view of the challenges faced by healthcare professionals and patients worldwide.
Presentations and discussions during the event focused on critical topics such as the use of new technologies, advancements in personalized therapies, and more effective prevention strategies. Additionally, particular attention was given to the unique challenges faced by the Amazon region, with efforts aimed at developing region-specific solutions to meet local needs.
Beyond being a high-caliber academic event, Oncology 2025 stood out as a moment for integration and professional networking, with the warm hospitality of the city of Belém offering participants a unique experience. This event became a platform for exchanging ideas, where science, culture, and humanity came together in pursuit of a common goal: to improve cancer control both in Brazil and globally.
This collection of abstracts and articles presented during the event reflects the ongoing dedication to research and the development of innovative solutions, highlighting the importance of collaboration and shared knowledge in the fight against cancer.
General Submission Guidelines:
The presenting author, who does not have to be the first author, must be registered for Oncology 2025.
Each abstract may have up to 10 authors, including the main author and co-authors.
Only original, unpublished work will be accepted.
Submissions must be related to oncology. However, project descriptions, work proposals, experience reports, and literature reviews will not be considered.
Clinical case reports are allowed, provided the abstract addresses scientific questions, details clinical observations, and includes primary scientific data.
The abstract must be written in English, but presentations may be given in Portuguese.
Abstracts must be between 300 and 500 words.
Comissão Organizadora
Comissão Científica
See Annals of Oncology 2023 at:
https://www.even3.com.br/anais/oncology-2023-international-symposium/
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