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Introducción. La resonancia magnética nuclear es un estudio ampliamente usado, que se ha convertido actualmente en una herramienta imprescindible para la toma de decisiones terapéuticas en los pacientes con cáncer de recto. El objetivo de este estudio fue esclarecer si los informes actuales cumplen con las recomendaciones internacionales respecto a los ítems que deben incluir para tomar mejores decisiones en el manejo y el seguimiento de los pacientes. Métodos. Estudio observacional, retrospectivo, de una cohorte de seguimiento de pacientes con cáncer de recto a quienes se les realizó resonancia magnética nuclear para estadificación o re-estadificación posterior a una terapia neoadyuvante, entre julio de 2020 y julio del 2022, en 2 centros de referencia de la ciudad de Medellín, Colombia. Resultados. En total se evaluaron 205 informes de resonancia magnética nuclear tomadas en pacientes con cáncer de recto, de los cuales el 50,2 % fueron de diagnóstico inicial sin terapia neoadyuvante y el 49,7 % fueron informes de re-estadificación posterior a terapia neoadyuvante. Se evaluaron 13 ítems de los reportes de las resonancias. Se encontró que un 2 % de los reportes fueron de alta calidad, 14,6 % de moderada calidad y 83,4 % de baja calidad. Conclusiones. La mayoría de los reportes de resonancia magnética nuclear en pacientes con cáncer de recto son de baja calidad, por lo tanto, serán necesarias estrategias que mejoren la comunicación, la estandarización y la calidad de los estudios.

Introduction. Magnetic resonance imaging (MRI) is the widely used study, which today has become an essential tool for therapeutic decisions in patients with rectal cancer. The objective of this study was to clarify whether current reports comply with international recommendations regarding the items they should have to make better decisions in the patients management and follow-up. Methods. Observational, retrospective study of a follow-up cohort of patients with rectal cancer who underwent MRI for staging or re-staging after neoadjuvant therapy, between July 2020 and July 2022, in two reference centers in the city of Medellín, Colombia. Results. In total, 205 MRI reports in patients with rectal cancer were reviewed, of which 50.2% were initial diagnosis without neoadjuvant therapy and 49.7% were reports of restaging after neoadjuvant therapy; 13 items from the MRI reports were evaluated. It was found that 2% of the reports were of high quality, 14.6% of moderate quality and 83.4% of low quality. Conclusions. Most MRI reports in patients with rectal cancer are of low quality; therefore, strategies will be necessary to improve communication, standardization and quality of the studies.

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Objective: To determine the effectiveness and safety of neoadjuvant therapy in gastroenteropancreatic neuroendocrine neoplasms (GEP?NENs) and provide evidence?based suggestions for clinical treatment. Methods: The Cochrane Library, Embase, PubMed, and Web of Science were searched for articles published that analyzed the effectiveness and safety of GEP?NEN?targeted neoadjuvant therapy before March 2023. A confidence interval (CI) of 95%, a subgroup analysis, heterogeneity, and effect size (ES) were analyzed, and a meta?analysis of the literature was performed using the Stata BE17 software. Results: A total of 417 patients from 13 studies were included in this meta?analysis. The primary variables comprised the objective response rate (ORR), disease control rate (DCR), surgical resection rate, and R0 resection rate with ES values of 0.42 (95% CI: 0.25–0.60), 0.96 (95% CI: 0.93–0.99), 0.67 (95% CI: 0.50–0.84), and 0.60 (95% CI: 0.54–0.67), respectively. The secondary variables were the incidence rates of treatment?related adverse events (TRAEs), Grade 3 or higher TRAEs, and surgical complications with ES values of 0.29 (95% CI: ?0.03–0.21), 0.13 (95% CI: ?0.07–0.33), and 0.35 (95% CI: 0.27–0.44), respectively. Conclusion: Neoadjuvant therapy is an effective and safe treatment method for GEP?NENs. However, further studies are required to determine the optimal regimen for this therapy in these tumors.

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Background and Purpose: Given the evolution of neoadjuvant therapy (NAT) for breast cancer, this study aimed to analyze trends in NAT regimens over time and patients’ pathological responses, tumor stages, and subtypes. Materials and Methods: Data were analyzed for 548 patients with cT1?4N0?3M0 breast cancer who received NAT at Shandong Cancer Hospital between 2011 and 2022. The 12?year study period was divided into six 2?year periods termed P1 to P6. Results: From P1 to P6, the proportion of stage II patients treated with NAT increased from 6.4% to 33.8% compared with same?stage operable breast cancer (r = 0.228, P < 0.001), while the proportion of the full?course group increased from 50.0% to 99.0% (r = 0.354, P < 0.001). The pathologic complete remission (pCR) rate in the full?course group increased from 30.8% to 54.6% (r = 0.248, P < 0.001). In the full?course human epidermal growth factor receptor?2 positive (HER2+) group, the proportion of chemotherapy combined with inhibition therapy increased from 33.3% to 100% (r = 0.530, P < 0.001). Furthermore, dual inhibition therapy increased from 0 to 98.9%. The proportion of the nonanthracycline group (dual inhibition) increased from 56.0% at P5 to 76.6% at P6 (r = 0.190, P = 0.042). In the full?course Triple?Negative Breast Cancer (TNBC) group, the proportion of platinum therapy increased from 0 to 41.9% (r = 0.324, P < 0.001) and immune drugs increased from 0 to 53.2% (r = 0.500, P < 0.001). Conclusion: Overall, the results indicate an increasing proportion of patients receiving NAT therapy over time. Furthermore, there were increases in HER2 + patients receiving inhibition therapy (especially dual inhibition) and TNBC patients receiving platinum and immune therapy as part of NAT. Notably, these changes were associated with improved outcomes.

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@#Neoadjuvant chemoradiotherapy or chemotherapy combined with surgery for locally advanced esophageal cancer has become the standard treatment, and despite the survival benefit, most patients still experience postoperative recurrence and distant metastasis. Immune checkpoint inhibitors play an anti-tumor role by activating T cells, and immunotherapy has become one of the important strategies for first-line and second-line treatment of advanced esophageal cancer with the continuous evolution of immunotherapy models. Regarding neoadjuvant immunotherapy for esophageal cancer, a large number of studies are being carried out and explored, which are expected to inject new vitality into neoadjuvant therapy for esophageal cancer. This article reviews the current clinical studies on neoadjuvant immunotherapy for esophageal cancer.

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In June 2017， National Health Commission of the People’s Republic of China released Guidelines for the diagnosis and treatment of primary liver cancer （2017 edition）， which provided important recommendations for the diagnosis， staging， and treatment of liver cancer. Since then， high-level evidence in line with the principles of evidence-based medicine has been continuously obtained from the research on primary liver cancer in China and globally. Therefore， National Health Commission released Guidelines for the diagnosis and treatment of primary liver cancer （2024 edition）. This article gives an interpretation of the updated key points in the guidelines， in order to better guide clinical practice.

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With the rapid development of science and technology, new technologies and methods for the diagnosis and treatment of colorectal cancer are constantly emerging, which has improved the survival of patients with colorectal cancer. At the same time, the progress in surgical technology is also changing profoundly due to information technology revolution. From open surgery to minimally invasive surgery, to robot-assisted surgery, AI technology, three-dimensional stereotactic technology, as well as the emergence of enhanced reality and digital diagnosis technology, all have greatly promoted the surgical treatment of colorectal cancer. Colorectal surgery has also become more precise, personalized, and more focused on reducing surgical trauma, protecting organ function, and improving patients' quality of life. This article aims to review the new progress and research hotspots in the surgical treatment of colorectal cancer in recent years from several aspects including organ preservation strategy, adjuvant/neoadjuvant treatment, minimally invasive surgery, difficult colorectal surgery, as well as liquid biopsy technology.

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Pancreatic surgery is one of the most challenging specialties in general surgery. Due to the variety of pancreatic diseases, the difficulty of surgery, and the differences in diagnosis and treatment among different diseases, treatment strategies for these diseases remain controversial. From the aspects of surgical treatment such as pancreatitis, pancreatic cystic neoplasms, pancreatic neuroendocrine neoplasms, and pancreatic cancer, as well as neoadjuvant therapy, adjuvant therapy, immunotherapy, and targeted therapy. We review and summarize the frontier progress of clinical and translational research in pancreatic surgery in 2023, in order to further standardize the diagnosis and treatment of pancreatic surgery.

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Lysine-specific demethylase 1 (LSD1) is the firstly discovered histone demethylase. In recent years, LSD1 has become a hot topic in the study of the development and progression of malignancies, and its expression is closely related to the poor prognosis of malignancies. At present, some studies have showed that LSD1 is strongly related to the proliferation, invasion and metastasis of triple-negative breast cancer (TNBC). However, the specific mechanism is not fully understood. This article summarizes the possible mechanism of the development and progression in LSD1 and TNBC, and reviews the latest progress of LSD1 in the clinical research application of TNBC, so as to provide a reference for drug combination therapy in TNBC patients.

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【Objective】 To investigate the differences in efficacy and long-term prognosis between locally progressive low and intermediate rectal cancer patients receiving fluorouracil-based neoadjuvant chemotherapy alone (mFOLFOX6/CapeOX) and neoadjuvant radiotherapy, and to compare the therapeutic efficacy in the two groups. 【Methods】 We retrospectively analyzed the clinicopathological data of 118 patients with locally progressive low and intermediate rectal cancer who received neoadjuvant therapy from January 2019 to December 2021 at The First Affiliated Hospital of Xi’an Jiaotong University, including gender, age, body mass index (BMI), and other clinicopathological parameters. The t-test, Mann Whitney test, chi-square test or Fisher’s exact test were used to compare the differences between the two groups of patients who received neoadjuvant chemotherapy alone or neoadjuvant radiochemotherapy in terms of short-term efficacy, lymph node manifestations and long-term prognosis, respectively. Survival rates were calculated and survival curves were plotted using the Kaplan-Meier method. 【Results】 In terms of efficacy, patients in the neoadjuvant radiotherapy group achieved better tumor regression (Z=-2.05, P=0.04) and solid tumor efficacy (Z=-2.42, P=0.015), but the difference between the two groups in terms of downstaging effect of clinical stage was not statistically significant. The number of lymph nodes detected was significantly lower in the neoadjuvant radiotherapy group (neoadjuvant chemotherapy vs. neoadjuvant radiochemotherapy, 13.19±3.83 vs. 9.55±4.00, t=5.02, P<0.001), but the two groups did not differ significantly in the number of lymph node positives and lymph node positive ratio. In terms of long-term prognosis, there was no statistically significant difference in the overall survival rate or disease-free survival rate of the two groups. 【Conclusion】 Compared with neoadjuvant chemotherapy alone, neoadjuvant radiotherapy showed better short-term efficacy in patients with locally progressive low and intermediate rectal cancer, but there was no statistically significant difference between the two treatment regimens in terms of long-term prognosis.

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Surgical treatment is the primary curative approach for hepatocellular carcinoma (HCC). In China, the proportion of advanced HCC is high, with a low rate of surgical removal at initial diagnosis and a high rate of postoperative recurrence, posing a serious threat to public health. With the advent of new therapeutic drugs and updated treatment concepts, the comprehensive treatment of HCC has entered a new era. Systemic treatments represented by targeted therapy and immuno-therapy, non-surgical local treatments such as interventional and radiotherapy, and the combination of systemic and local treatments, have significantly improved the treatment efficacy, bringing hope to patients. The authors review past studies, summarize diagnostic and treatment experience, and discuss the comprehensive treatment strategy for HCC in the era of targeted and immunotherapy, with surgery as the main approach.

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Rectal cancer is a common malignant tumor in China, with a high mortality rate ranking fifth. Neoadjuvant therapy for rectal cancer can improve patient prognosis and even achieve pathological complete remission (pCR) in some patients, thereby avoiding complications and functional damage caused by radical surgery. Therefore, how to accurately evaluate pCR before surgery is currently a research hotspot. In recent years, new imaging technologies such as endorectal ultrasound, magnetic resonance imaging (MRI), and positron emission computed tomography (PET-CT) have developed rapidly, and imaging evaluation of pCR after neoadjuvant therapy for rectal cancer has achieved good results. This article provides a review of this field, aiming to provide a basis for personalized treatment of rectal cancer patients.

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Based on the background of a multidisciplinary treatment team and the increasing high-quality life aspirations of patients,the preservation of anal function for patients with low rectal cancer has undergone changes in recent years.With the optimization of neoadjuvant therapy,refinement of surgical techniques,and the deepening of the concept of anal preservation after surgery,the concept of anal preservation for low rectal cancer has gradually shifted from traditional simple surgery to comprehensive treatment,and anal preservation surgery tends to be more accurate preservation.The goal of comprehensive treatment is to preserve good anal function and reduce surgical damage.However,comprehensive treatment for anal preservation in low rectal cancer is still in its infancy,and there is no consensus on the strategy planning for anal preservation.Therefore,summarizing various preoperative,intraoperative,and postoperative treatment strategies for low rectal cancer is of great significance for the selection of anal preservation schemes for patients with low rectal cancer.This article focus on exploring the optimization of neoadjuvant therapy models,"watch and wait"plans,the development of anal preservation techniques,and postoperative and preservation strategies,aiming to review the current status of anal preservation strategy planning for low rectal cancer.

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Diagnosis and treatment of locally advanced rectal cancer(LARC)must be completed by a collaborative model of a multi-disciplinary team.The neoadjuvant chemoradiotherapy significantly reduced the local recurrence rate of LARC,but did not affect the occurrence of distant metastases and overall survival.Total neoadjuvant therapy(TNT),by strengthening the intensity of chemotherapy and extending the time from radiotherapy to surgery,can improve the tumor response rate as well as disease-free survival rate and metastasis-free survival rate.It offers advantages such as enhancing the compliance with chemotherapy,maximizing tumor regression,improving survival and increasing the chance of organ preservation.TNT is a promising treatment model for LARC patients with high risk of distant metastasis or strong desire for organ preservation.With the application of immunotherapy in the field of TNT,the mode of TNT continues to expand.And the exploration of therapeutic predictive markers will help to provide a personalized treatment for patients.

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Neoadjuvant therapy is a preoperative systemic treatment for patients with breast cancer. This therapy has greatly improved the clinical outcomes of human epidermal growth factor receptor 2 (HER2)-positive breast cancer, which is associated with poor prognosis. Currently, dual anti-HER2 antibodies, including trastuzumab and pertuzumab, combined with non-anthracycline chemotherapy is one of the standard regimens to achieve high pathologic complete response rate and satisfactory efficacy. The combination of trastuzumab with tyrosine kinase inhibitors, antibody-drug conjugate drugs, or immunotherapy combined with target therapy, under the indications of reasonable biomarkers, is effective for HER2-positive breast cancer. In this article, we briefly reviewed neoadjuvant therapy in the dual-targeting therapy era and discussed its future perspectives.

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The vast majority of thyroid cancers show a good prognosis. However, the treatment of locally advanced thyroid cancer presents a huge problem. The wide application of targeted and immunotherapy in neoadjuvant therapy for locally advanced thyroid cancer has become a new therapeutic direction. This article summarizes the research on neoadjuvant chemotherapy, radiotherapy, and targeted therapy and immunotherapy related to various pathological types of thyroid cancer, with a focus on the recent advancements and thoughts on the application of targeted and immunotherapeutic drugs in neoadjuvant therapy. The results provide additional options for the clinical treatment of locally advanced thyroid cancer.

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Gastric cancer is one of the common malignant tumors of digestive system in our country.The proportion of patients in advanced and late stage is large,and the choice of perioperative treatment program is always difficult in clinic.For most locally advanced gastric cancer,compared with standard radical surgery combined with postoperative adjuvant chemotherapy,perioperative treatment mode may further improve the survival of patients.However,the efficacy of conventional chemotherapy regimen has reached a plateau,while the progress of traditional molecular targeted therapy is relatively slow.In recent years,with the increasing role of immunotherapy in the treatment of advanced gastric cancer,more and more clinical studies have shown that immunotherapy can also achieve better efficacy in perioperative gastric cancer patients.This article reviewed the research progress of immunotherapy in perioperative gastric cancer in recent years.

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ABSTRACT Background: To evaluate the relationship between the ratio of affected lymph nodes (LNR) and clinical and anatomopathological variables in patients with rectal adenocarcinoma submitted or not to neoadjuvant chemoradiotherapy. Methods: The LNR was determined by dividing the number of compromised LNR by the total number of LNR dissected in the surgical specimen. Patients were divided into two groups: with QRT and without QRT. In each group, the relationship between LNR and the following variables was evaluated: degree of cell differentiation, depth of invasion in the rectal wall, angiolymphatic /perineural invasion, degree of tumor regression and occurrence of metastases. The LNR was evaluated in patients with more than 1, LNR (LNR >12) or less (LNR<12) in the surgical specimen with overall survival (OS) and disease-free survival (DFS). The results were expressed as the mean with the respective standard deviation. Qualitative variables were analyzed using Fisher's exact test, while quantitative variables were analyzed using the Kruskal -Wallis and Mann-Whitney tests. The significance level was 5%. Results: We evaluated 282 patients with QRT and 114 without QRT, between 1995-2011. In the QRT Group, LNR showed a significant association with mucinous tumors (P=0.007) and degree of tumor regression (P=0.003). In both groups, LNR was associated with poorly differentiated tumors (P=0.001, P=0.02), presence of angiolymphatic invasion (P<0.0001 and P=0.01), perineural (P=0.0007, P=0.02), degree of rectal wall invasion (T3>T2; P<0.0001, P=0.02); Compromised LNR (P<0.0001, P<0.01), metastases (P<0.0001, P<0.01). In patients with QRT, LNR<12 was associated with DFS (5.889; 95%CI1.935-19.687; P=0.018) and LNR>12 with DFS and OS (17.984; 95%CI5.931-54.351; P<0.001 and 10.286; 95%CI 2.654-39.854; P=0.007, respectively). Conclusion: LNR was associated with histological aspects of poor prognosis, regardless of the use of QRT. In the occurrence of less than 12 evaluated LNR, the LNR was associated only with the DFS.

RESUMO Contexto: Avaliar a relação entre a razão de linfonodos (RLA) acometidos e variáveis clínicas e anatomopatológicas em portadores de adenocarcinoma de reto submetidos ou não à quimiorradioterapia neoadjuvante. Métodos: A RLA foi determinada dividindo-se o número total de linfonodos (LFNs) dissecados no espécime cirúrgico pelo número de comprometidos. Os doentes foram divididos em dois grupos: com QRT e sem QRT. Em cada grupo foi avaliada a relação entre a RLA e as seguintes variáveis: grau de diferenciação celular, profundidade de invasão na parede retal, invasão angiolinfática/perineural, grau de regressão tumoral e ocorrência de metástases. Avaliou-se a RLA em pacientes com mais do que 12 LFNs (RLA>12) ou menos (RLA<12) na peça cirúrgica com a sobrevida global (SG) e sobrevida livre de doença (SLD). Os resultados foram expressos pela média com o respectivo desvio padrão. As variáveis qualitativas foram analisadas utilizando-se o teste exato de Fisher, enquanto as quantitativas pelos testes de Kruskal-Wallis e Mann-Whitney. O nível de significância foi de 5%. Resultados: Foram avaliados 282 pacientes com QRT e 114 sem QRT, entre 1995-2011. No Grupo QRT, RLA mostrou associação significativa com os tumores mucinosos (P=0,007) e grau de regressão tumoral (P=0,003). Nos dois grupos, a RLA associou-se com tumores pouco diferenciados (P=0,001 e P=0,02), presença de invasão angiolinfática (P<0,0001 e P=0,01), perineural (P=0,0007 e P=0,02), grau de invasão da parede retal (T3>T2; P<0,0001 e P=0,02); LFNs comprometidos (P<0,0001 e P<0,01), metástases (P<0,0001 e P<0,01). Nos pacientes com QRT, a RLA <12 associou-se com a SLD (5,889; IC95%1,935-19,687; P=0,018) e a RLA >12 com SLD e SG (17,984; IC95%5,931-54,351; P<0,001 e 10,286; IC95%2,654-39,854; P=0,007, respectivamente). Conclusão: A RLA associou-se a aspectos histológicos de mau prognóstico, independentemente do emprego de QRT. Na ocorrência de menos de 12 LFNs avaliados, a RLA associou-se apenas com a SLD.

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Introducción: La quimioterapia previa o en curso puede presentar una amplia gama de interacciones, que aumentan el efecto clínico y la toxicidad de fármacos utilizados en quimioterapia, como los anestésicos. Objetivo: Evaluar la influencia de la anestesia sobre las pacientes con neoplasia de mama que recibieron o no quimioterapia neoadyuvante. Métodos: Se realizó un estudio cuasiexperimental, prospectivo, de corte longitudinal en el Servicio de Anestesiología y Reanimación del Hospital Clínico Quirúrgico Hermanos Ameijeiras, durante el período comprendido de enero de 2021 a enero de 2023. Resultados: La edad promedio fue 53,2 años en el Grupo I y 55,4 años en el II. En ambos grupos predominaron los pacientes ASA II, con 92,0 % en el I y 88,0 % en el II. El 92,0 % de las pacientes del Grupo I y el 96,0 % de los del Grupo II recibieron anestesia balanceada. La arritmia (20 %), seguida de prolongación del segmento QT, (4,0 %), la hipertensión arterial (4,0 %), la oliguria (16,0 %) y el dolor posoperatorio (12,0 %) fueron las complicaciones más frecuentes en los pacientes que recibieron quimioterapia neoadyuvante. En cuanto a la gravedad, en el 56 % de los pacientes fue severa. El 44 % de las complicaciones (arritmias, prolongación QT e hipertensión arterial y oliguria) aparecieron de manera mediata en el posoperatorio. Conclusiones: Se evaluó la influencia de la anestesia sobre las pacientes con neoplasia de mama que recibieron o no quimioterapia neoadyuvante, y se identificaron las complicaciones asociadas a la conducta anestésica.

Introduction: Drugs used for chemotherapy treatment in the cancer patient may increase the clinical effect and toxicity of anesthetics. Objective: To evaluate the clinical response of anesthesia in female patients operated on for breast cancer who received neoadjuvant chemotherapy. Methods: A quasiexperimental, prospective, longitudinal and controlled study was carried out at the anesthesiology and resuscitation service of Hospital Clínico Quirúrgico Hermanos Ameijeiras, during the period from January 2021 to January 2023. Results: Fifty patients were evaluated, whose average ages were 53.2 years in Group I and 55.4 years in Group II. Both groups were dominated by patients with American Society of Anesthesia Grade II criteria (92.0 % vs. 88.0 %). Balanced anesthesia was received by 92.0 % of the patients in Group I and 96.0 % of those in Group II. In terms of safety, arrhythmia (20.0 %), QT segment prolongation (4.0 %), arterial hypertension (4.0 %), oliguria (16.0 %) and postoperative pain (12.0 %) were predominant in relation to previous treatment. 56.0 % were grade IV or severe and 44.0 % (arrhythmias, QT prolongation and arterial hypertension and oliguria) had postoperative mediated onset. Conclusions: Complications due to anesthetic agents in patients with neoadjuvant chemotherapy for breast cancer are more frequent and severe. Complications were identified in relation to the administration of anesthesia.

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Abstract Prognostic factors for local recurrence in patients with rectal cancer submitted to neoadjuvant chemoradiotherapy and total mesorectal excision. Background: The standard curative treatment for locally advanced rectal cancer of the middle and lower thirds is long-course chemoradiotherapy followed by total mesorectal excision. Purpose: To evaluate the prognostic factors associated with local recurrence in patients with rectal cancer submitted to neoadjuvant chemoradiotherapy and total mesorectal excision. Methods: Retrospective study including patients with rectal cancer T3-4N0M0 or T (any)N + M0 located within 10 cm from the anal border, or patients with T2N0M0 located within 5 cm, treated by long course chemoradio-therapy followed by total mesorectal excision with curative intent. Clinical, demographic, radiologic, surgical, and anatomopathological data were collected. Local recurrence was estimated using the Kaplan-Meier function, and risk was estimated according to each characteristic using univariate and multivariate analyses. Results: 270 patients were included, 57.8% male and mean age 61.7 (30‒88) years. At initial staging, 6.7% of patients were stage I, 21.5% stage II, and 71.8% stage III. Open surgery was performed in 65.2%, with sphincter preservation in 78.1%. Mortality within 30 postoperative days was 0.7%. After 49.4 (0.5‒86.1) months of median follow-up, overall and local recurrences were 26.3% and 5.9%. On multivariate analyses, local recurrence was associated with involvement of the mesorectal fascia on restaging MRI (HR = 9.11, p = 0.001) and with pathologic involvement of radial surgical margin (HR = 8.19, p < 0.001). Conclusion: Local recurrence of rectal cancer treated with long-course chemoradiation and total mesorectal excision is low and is associated with pathologic involvement of the radial surgical margin and can be predicted on restaging MRI.

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Abstract Colorectal cancer is the third most common cancer and the second leading cause of cancer-related death. Rectal cancer accounts for approximately one-third of new colorectal cancer cases, with adenocarcinoma as the predominant subtype. Despite an overall decline in colorectal cancer incidence and mortality, due to advancements in screening, early diagnosis, and treatment options, there is a concerning increase in incidence rates among young patients. Recent significant advances in managing locally advanced rectal cancer, such as the establishment of different surgical approaches, neoadjuvant treatment using different protocols for high-risk cases, and the adoption of organ-preservation strategies, have increased the importance of the role played by radiologists in locoregional assessment on magnetic resonance imaging at baseline, at restaging, and during active surveillance of patients with rectal cancer. In this article, we review the role of restaging rectal magnetic resonance imaging after neoadjuvant therapy, providing radiologists with a practical, step-by-step guide for assessing treatment response.

Resumo O câncer colorretal é o terceiro câncer mais comum e a segunda principal causa de morte relacionada ao câncer. O câncer retal representa aproximadamente um terço dos novos casos de câncer colorretal, sendo o adenocarcinoma o subtipo predominante. Apesar de uma diminuição geral na incidência e mortalidade, impulsionada por avanços na prevenção do câncer, diagnóstico precoce e opções de tratamento aprimoradas, há uma preocupante elevação nas taxas entre os pacientes jovens. Avanços recentes significativos no manejo do câncer retal localmente avançado, como abordagens cirúrgicas, o uso de diferentes protocolos de tratamento neoadjuvante para casos de alto risco e a adoção de estratégias de preservação de órgãos, aumentaram o papel dos radiologistas na avaliação locorregional por meio da ressonância magnética na avaliação inicial, reestadiamento e vigilância ativa de pacientes com câncer retal. Este manuscrito tem como objetivo revisar o papel da ressonância magnética retal no reestadiamento após terapia neoadjuvante, fornecendo aos radiologistas um guia prático para revisar exames nesse contexto.