Retroperitoneal Node Metastases Research Articles

111In-Pentetreotide-Guided Radiosurgery for Intraoperative Localization of Retroperitoneal Nodal Metastasis in a Patient With Ileal Neuroendocrine Tumor.

64Cu-DOTATATE PET/CT of a 44-year-old man with an ileal neuroendocrine tumor demonstrated the primary tumor, local nodal metastases, and a pericaval nodal metastasis. Localization of the pericaval node during surgery may be difficult, thus 4.4 mCi of 111In-pentetreotide was administered before surgery to assist with localization and resection. At surgery, the pericaval nodal metastasis was readily detected by gamma probe, which could then be resected and pathologically proven to be a metastasis. This demonstrates the use of somatostatin receptor-targeted imaging for intraoperative localization of an otherwise difficult to surgically localize metastasis. Without intraoperative somatostatin receptor-targeted radiosurgery, disease may have been incompletely resected.

Oligometastasis of Gastric Cancer: A Review

The concept of oligometastasis is not yet fully established in the field of gastric cancer. However, metastatic lesions that are localized, technically resectable at diagnosis, present a certain response to preoperative chemotherapy, and present favorable survival outcomes with local treatments, sometimes in combination with chemotherapy, are recognized as oligometastasis in the field of gastric cancer. Oligometastasis is noted in European Society for Medical Oncology guidelines and Japanese gastric cancer treatment guidelines, and local treatment is mentioned as one of the pivotal treatment options for oligometastasis. Solitary liver metastasis or a small number of liver metastases; retroperitoneal lymph node metastasis, especially localized para-aortic lymph node metastasis; localized peritoneal dissemination; and Krukenberg tumor are representative types of oligometastasis in gastric cancer. The AIO-FLOT3 trial prospectively evaluated the efficacy of multimodal treatments for gastric cancer with oligometastasis, including surgical resection of primary and metastatic lesions combined with chemotherapy, confirming favorable survival outcomes. Two phase 3 studies are ongoing to investigate the efficacy of surgical resection combined with perioperative chemotherapy compared with palliative chemotherapy. Thus far, the evidence suggests that multimodal treatment for oligometastasis of gastric cancer is promising.

PD-1 inhibition combined with intensity-modulated radiotherapy, to better serve patients with retroperitoneal lymph node metastases from gastrointestinal cancer.

Gastrointestinal (GI) cancer is the most frequent kind of cancer to involve the retroperitoneal lymph nodes (RPLNs). Radiotherapy (RT) is common treatment of RPLN metastases in patients with GI cancer, while RT is local. Meanwhile, most patients have extra-retroperitoneal metastases. Immunotherapy plus RT have showed effective in advanced non-small cell lung cancer. However, whether the combination therapy is effective on GI cancer with RPLN metastases. In our study, we would estimate the effect of programmed death-1 (PD-1) inhibition in association with intensity modulated radiation therapy (IMRT). Metastatic GI cancer patients with RPLN who were treated at a single institution were retrospectively evaluated from October 2016 to April 2023, who all had measurable lesion and received any therapy of PD-1 inhibitors alone, IMRT alone or PD-1 inhibitors plus IMRT. The follow-ups were assessed by abdominal computed tomography (CT) every 2 or 3 months to progression, dose-limiting toxicity or death. Among the 98 patients, 46 were treated by PD-1 inhibitors combined with IMRT, 26 were by PD-1 inhibitors only and 26 were by IMRT only. Of those, the median age 62 years (range, 25-84 years). Median progression-free survival (PFS) was 7.5 months and median overall survival (OS) was 10.8 months across the 3 therapy groups. Univariate analysis (UVA) indicated that therapy method (P=0.032) and tumor response (P=0.035) were significantly related to PFS. In the PD-1 inhibitors plus IMRT group, 1 patient (2.2%) achieved complete response (CR), 30 (65.2%) had partial remission, and 14 (30.4%) had stable disease. There was no case with CR by IMRT or PD-1 inhibitors alone. Objective response rate (67.4%) and disease control rate (97.8%) were higher in the PD-1 inhibitors combined with IMRT group. In the PD-1 inhibitors plus IMRT and PD-1 inhibitors alone groups, hepatitis B virus (HBV)-positive patients had better OS (P=0.041) on UVA. Meanwhile, in the PD-1 inhibitors plus IMRT group, we observed superior PFS (P=0.041) and OS (P=0.049) in HBV-positive patients on UVA. PD-1 inhibitors plus IMRT may be a better method for advanced GI cancer patients with RPLN metastases. HBV-positive patients can benefit from either PD-1 inhibitors alone or in combination with IMRT.

Inconsistency in the assessment of retroperitoneal lymph node metastasis in patients with testicular cancer: Influence on clinical stage, therapy and relapse rate.

Inconsistency in the assessment of retroperitoneal lymph node metastasis in patients with testicular cancer: Influence on clinical stage, therapy and relapse rate.

Metastatic Colorectal Cancer Treated with Combined Liver Resection, Cytoreductive Surgery, and Hyperthermic Intraperitoneal Chemotherapy (HIPEC): Predictive Factors for Early Recurrence.

Selection of colorectal cancer patients with concomitant peritoneal (PM) and liver metastases (LM) for radical treatment with cytoreductive surgery (CRS), including liver resection and hyperthermic intraperitoneal chemotherapy (HIPEC), needs improvement. This retrospective, monocentric study was designed to evaluate the predictive factors for early recurrence, disease-free survival (DFS), and overall survival (OS) in such patients treated in a referral center. Consecutive colorectal cancer patients with concomitant LM and PM treated with curative intent with perioperative systemic chemotherapy, simultaneous complete CRS, liver resection, and HIPEC in 2011-2022 were included. Clinical, radiological (before and after preoperative chemotherapy), surgical, and pathological data were investigated, along with long-term oncologic outcomes. A multivariate analysis was performed to identify predictive factors associated with early recurrence (diagnosed <6 months after surgery), DFS, and OS. Of more than 61 patients included, 31 (47.1%) had pT4 and 27 (40.9%) had pN2 primary tumors. Before preoperative chemotherapy, the median number of LM was 2 (1-4). The median surgical PCI (peritoneal carcinomatosis index) was 3 (5-8.5). The median DFS and OS were 8.15 (95% confidence interval [CI] 5.5-10.1) and 34.1 months (95% CI 28.1-53.5), respectively. In multivariate analysis, pT4 (odds ratio [OR] = 4.14 [1.2-16.78], p = 0.032]) and pN2 (OR = 3.7 [1.08-13.86], p = 0.042) status were independently associated with an early recurrence, whereas retroperitoneal lymph node metastasis (hazard ratio [HR] = 39 [8.67-175.44], p < 0.001) was independently associated with poor OS. In colorectal cancer patients with concomitant PM and LM, an advanced primary tumor (pT4 and/or pN2) was associated with a higher risk of early recurrence following a radical multimodal treatment, whereas RLN metastases was strongly detrimental for OS.

Perioperative complication incidence and risk factors for retroperitoneal neuroblastoma in children: analysis of 571 patients

BackgroundSurgery plays an important role in the treatment of neuroblastoma. Perioperative complications may impact the course of neuroblastoma treatment. To date, comprehensive analyses of complications and risk factors have been lacking.MethodsPatients with retroperitoneal neuroblastoma undergoing tumor resection were retrospectively analyzed between 2014 and 2021. The data collected included clinical characteristics, operative details, operative complications and postoperative outcomes. Risk factors for perioperative complications of retroperitoneal neuroblastoma were analyzed.ResultsA total of 571 patients were enrolled in this study. Perioperative complications were observed in 255 (44.7%) patients. Lymphatic leakage (28.4%), diarrhea (13.5%), and injury (vascular, nerve and organ; 7.5%) were the most frequent complications. There were three operation-related deaths (0.53%): massive hemorrhage (n = 1), biliary tract perforation (n = 1) and intestinal necrosis (n = 1). The presence of image-defined risk factors (IDRFs) [odds ratio (OR) = 2.09, P < 0.01], high stage of the International Neuroblastoma Risk Group staging system (INRGSS) (OR = 0.454, P = 0.04), retroperitoneal lymph node metastasis (OR = 2.433, P = 0.026), superior mesenteric artery encasement (OR = 3.346, P = 0.003), and inferior mesenteric artery encasement (OR = 2.218, P = 0.019) were identified as independent risk factors for perioperative complications.ConclusionsDespite the high incidence of perioperative complications, the associated mortality rate was quite low. Perioperative complications of retroperitoneal neuroblastoma were associated with IDRFs, INRGSS, retroperitoneal lymph node metastasis and vascular encasement. Patients with high-risk factors should receive more serious attention during surgery but should not discourage the determination to pursue total resection of neuroblastoma.8e95DYrdivwNpNwDkEtfUxVideo (MP4 94289 KB)

Collecting duct carcinoma with retroperitoneal mass as initial presentation: a rare case report

BackgroundCollecting duct carcinoma (CDC) is a rare renal tumor, originating from the distal collecting duct. CDC rarely presents as a primary tumor outside the renal system.Case presentationIn this study, we report a rare case of collecting duct carcinoma, with an initial presentation of retroperitoneal lymph node metastasis, and no identifiable primary renal tumor on CT, at the time of diagnosis. The patient was a 64-year-old man presenting with lower back pain. Preoperative CT showed a round, soft tissue mass, measuring 6.7 × 4.4 × 3.3 cm, in the left retroperitoneum with no exact occupying lesion in the left kidney. Clinically, ectopic pheochromocytoma was considered to be a differential diagnosis, and tumor resection was performed. Postoperative pathological results demonstrated that the mass was a fused lymph node, and the tumor cells were destroying the structure. The final diagnosis was lymph node metastatic collecting duct carcinoma, by histology and immunohistochemistry. No further treatment was performed as no space occupying lesion was found in the kidney. Three months later, CT was reexamined, and a mass of 3.6 cm in diameter, was found in the lower left kidney, along with multiple soft tissue masses, in the left renal hilum. Considering recurrence or metastasis, the patient was recommended to undergo surgical treatment, but the patient refused. Four months later, CT was re-examined. The tumor had rapidly progressed but the patient refused treatment again. As per the author’s press release (eleven months after the first discovery), the patient is still alive.ConclusionCDC is a rare malignant renal carcinoma, with a high chance of rapid progress, regional lymph nodes involvement and metastasis. It presents diagnostic challenges to clinicians and pathologists, particularly, in the absence of radiographically detectable intrarenal lesions. Definite diagnosis is based on pathological examination combined with immunohistochemical staining.

Donafenib, anti-PD-1 antibodies, plus hepatic arterial infusion chemotherapy (HAIC) as conversion therapy in patients with initially unresectable hepatocellular carcinoma (HCC): A prospective, single-arm, phase 2 study.

e16140 Background: Most patients with hepatocellular carcinomas (HCC) are diagnosed at intermediate to advanced stages, at which they have missed the opportunity for curative resection. Combination therapy with tyrosine kinase inhibitors, anti-PD-1 antibodies and HAIC has achieved a high response rate for advanced HCC. Phase 3 study also showed the survival benefit of donafenib for unresectable HCC compared with sorafenib. This study aimed to explore the efficacy and safety of conversion therapy with HAIC plus donafenib, anti-PD-1 antibodies in the patients with initially unresectable HCC. Methods: This was a prospective single-arm, phase 2 study (ChiCTR2200059297). Eligible patients were adults who were newly diagnosed with HCC, not amenable to curative resection, with an ECOG PS 0-1 and Child-Pugh class A/B7. Patients received FOLFOX HAIC (oxaliplatin 85 mg/m2 3h, leucovorin 200 mg/m2 2h, fluorouracil bolus 400 mg/m2 in the first 15 minutes, and fluorouracil infusion 2400 mg/m2 for 46 hours) Q3W plus donafenib 200mg bid, anti-PD-1 antibodies Q3W until disease progression or unacceptable toxicity, followed by multidisciplinary assessment and potential hepatectomy. The primary endpoint was conversion success rate. Secondary endpoints included objective response rate (ORR), disease control rate (DCR), pathologic complete remission (pCR), event free survival (EFS), overall survival (OS) and safety. Results: From Sep 2021 to Dec 2022, 22 pts were enrolled with a median age of 57 years (range, 43-76). The study population was predominantly HBV-positive (71.4%). All pts were in BCLC stage C, the rate of macro vascular invasion and retroperitoneal lymph node metastasis were 71.4% and 28.6% respectively. As of Jan 31, 2023 cut-off, 19 pts were evaluable for response. The conversion success rate was 52.6% (10/19) and 4 pts received hepatectomy. Among the 4 pts, 1 (25%) case achieved complete pathological response and 2 (50%) cases achieved major pathological response. Based on mRECIST, ORR was 84.2% (95%CI, 0.60-0.90) with 2 (10.5%) complete responses (CR) and 14 (73.7%) partial responses (PR). DCR was 94.7% (95%CI, 0.74-0.99). The 12 months’ EFS rate was 50.4%, the median EFS and OS were not reached. All pts were evaluable for toxicity, and 18 (81.8%) pts had at least one treatment-emergent AE (TEAE). TEAEs occurring in ≥20% of pts were decreased platelet count (36.4%), hand-foot skin reactions (31.82%), rash (27.3%), elevated ALT (22.7%) and decreased WBC count (22.7%). 10 (45.5%) pts had level 3 TEAE. There were no level 4 and 5 TEAEs. Conclusions: A triple combination of donafenib, anti-PD-1 antibodies and HAIC is well tolerated and effective, it’s a feasible conversion therapy for patients with unresectable locally intermediate to advanced HCC. The enrollment and follow-up are continuing. Clinical trial information: ChiCTR2200059297 .

24 - Burned – out testicular tumour with retroperitoneal lymph node metastasis and spinal canal stenosis: A case report

24 - Burned – out testicular tumour with retroperitoneal lymph node metastasis and spinal canal stenosis: A case report

CT Radiomics and Clinical Feature Model to Predict Lymph Node Metastases in Early-Stage Testicular Cancer

Accurate retroperitoneal lymph node metastasis (LNM) prediction in early-stage testicular germ cell tumours (TGCTs) harbours the potential to significantly reduce over- or undertreatment and treatment-related morbidity in this group of young patients as an important survivorship imperative. We investigated the role of computed tomography (CT) radiomics models integrating clinical predictors for the individualised prediction of LNM in early-stage TGCT. Ninety-one patients with surgically proven testicular germ cell tumours and contrast-enhanced CT were included in this retrospective study. Dedicated radiomics software was used to segment 273 retroperitoneal lymph nodes and extract features. After feature selection, radiomics-based machine learning models were developed to predict LN metastasis. The robustness of the procedure was controlled by 10-fold cross-validation. Using multivariable logistic regression modelling, we developed three prediction models: a radiomics-only model, a clinical-only model, and a combined radiomics–clinical model. The models’ performances were evaluated using the area under the receiver operating characteristic curve (AUC). Finally, decision curve analysis was performed to estimate the clinical usefulness of the predictive model. The radiomics-only model for predicting lymph node metastasis reached a greater discrimination power than the clinical-only model, with an AUC of 0.87 (±0.04; 95% CI) vs. 0.75 (±0.08; 95% CI) in our study cohort. The combined model integrating clinical risk factors and selected radiomics features outperformed the clinical-only and the radiomics-only prediction models, and showed good discrimination with an area under the curve of 0.89 (±0.03; 95% CI). The decision curve analysis demonstrated the clinical usefulness of our proposed combined model. The presented combined CT-based radiomics–clinical model represents an exciting non-invasive tool for individualised LN metastasis prediction in testicular germ cell tumours. Multi-centre validation is required to generate high-quality evidence for its clinical application.

German specialists treating testicular cancer follow different guidelines with resulting inconsistency in assessment of retroperitoneal lymph-node metastasis: clinical implications and possible corrective measures

BackgroundTesticular germ cell tumors (GCTs) are aggressive but highly curable tumors. To avoid over/undertreatment, reliable clinical staging of retroperitoneal lymph-node metastasis is necessary. Current clinical guidelines, in their different versions, lack specific recommendations on how to measure lymph-node metastasis.ObjectiveWe aimed to assess the practice patterns of German institutions frequently treating testicular cancer for measuring retroperitoneal lymph-node size.MethodsAn 8‐item survey was distributed among German university hospitals and members of the German Testicular Cancer Study Group.ResultsIn the group of urologists, 54.7% assessed retroperitoneal lymph nodes depending on their short-axis diameter (SAD) (33.3% in any plane, 21.4% in the axial plane), while 45.3% used long-axis diameter (LAD) for the assessment (42.9% in any plane, 2.4% in the axial plane). Moreover, the oncologists mainly assessed lymph-node size based on the SAD (71.4%). Specifically, 42.9% of oncologists assessed the SAD in any plane, while 28.5% measured this dimension in the axial plane. Only 28.6% of oncologists considered the LAD (14.3% in any plane, 14.3% in the axial plane). None of the oncologists and 11.9% of the urologists (n = 5) always performed an MRI for the initial assessment, while for follow-up imaging, the use increased to 36.5% of oncologists and 31% of urologists. Furthermore, only 17% of the urologists, and no oncologists, calculated lymph-node volume in their assessment (p = 0.224).ConclusionClear and consistent measurement instructions are urgently needed to be present in all guidelines across different specialistic fields involved in testicular cancer management.

Retrospective Analysis of a Cohort of Patients with Metastatic Bladder Cancer with Metastatic Sites Limited to the Pelvis and Retroperitoneum Treated at a Single Institution between 2009 and 2020.

Bladder cancer (BC) presenting with pelvic and retroperitoneal lymph nodes presents a therapeutic challenge. The impact of chemoradiotherapy on pelvic and retroperitoneal lymph node metastasis as a consolidation treatment has not been established. Between 2009 and 2020, 502 patients who were treated with first-line chemotherapy for BC in our center, were retrospectively identified. Patients who received chemoradiotherapy or radiotherapy with an equivalent radiation dose superior to 30 Gy were included in the RTCT group, and other patients were included in the control group (CT group). We performed an analysis of progression-free survival (PFS) and overall survival (OS) for these two cohorts using the Kaplan-Meier method. A total of 89 patients were included, 24 in the RTCT group and 65 in the CT group. Chemoradiotherapy improved both OS (p = 0.034) and PFS (p = 0.009) in comparison with chemotherapy alone: 26.3 months (95% IC 0.0-52.9) and 19.4 months (95% IC 5.0-33.7), respectively, in the RTCT group versus 17.2 months (95% IC 13.7-20.6) and 11.2 months (95% IC 8.6-13.8), respectively, in the CT group. Grade 3/4 toxicity was related to chemotherapy and to chemoradiotherapy at levels of 31% and 24%, respectively. For mBC with metastatic regional or retroperitoneal lymph nodes, chemoradiotherapy seems to confer benefits for both OS and PFS.

Management of Metastatic Paratesticular Tumour in a Resource-Poor Setting

Abstract Paratesticular tumours are tumours that arise from the testicular tunics, spermatic cord, epididymis, or vestigial remnants. The tumours are rare and account for approximately 5% of intrascrotal neoplasms. About 75% of these tumours arise from the spermatic cord. Paratesticular tumours most commonly manifest as painless scrotal masses. Alternatively, the tumour may be incidentally noticed when a scrotal ultrasound scan is done for another intrascrotal pathology such as hydrocele, inguinoscrotal hernia, epididymo-orchitis, or suspected testicular tumour. We present a case of metastatic paratesticular tumour in a 21-year-old Nigerian male, who presented at the University of Nigeria Teaching Hospital, Ituku-Ozalla, Enugu, in September 2018 at the age of 19 years with a painless right hemiscrotal mass. The patient was clinically evaluated with scrotal ultrasonography, testicular tumour markers, and liver function test. Biopsy specimen obtained was ignorantly discarded by the patient who was subsequently lost to follow-up. Histologic diagnosis of mesenchymal tumour (myxoid liposarcoma) was made two years after his initial presentation when he developed both inguinal and retroperitoneal lymph node metastasis at the age of 21 years. He was evaluated as clinical stage IV disease and then commenced on chemotherapy after baseline investigations. Our objective of presenting this report is to highlight the effect of delayed diagnosis in the management outcome, challenges in the provision of resources in low- and middle-income countries, and to emphasise the rarity of the tumour in our subregion.

A Case of Lung Squamous Cell Carcinoma Retroperitoneal Lymph Node Metastasis Whose Lymphedema Was Improved by Radiation Therapy and Was Temporarily Discharged from the Hospital

症例は73歳女性．肺扁平上皮がん（cT3N3M0-Stage IIIC）に対し当科治療中．2022年6月より肺がん進行に伴い後腹膜リンパ節転移による腰背部痛が増強した．疼痛以外に両下肢浮腫による体動困難もあり7月8日に緊急入院し，後腹膜リンパ節転移に対して放射線治療（30 Gy/10 fr）を行った．タペンタドール200 mg/日で疼痛管理を行っていたが入院中にフェンタニル貼付剤1200 µg/日へ変更し腰背部痛は軽減した．また浮腫の原因疾患を鑑別し，理学所見・検査所見や病歴から，後腹膜リンパ節転移に関連したリンパ浮腫と診断した．入院31日目に浮腫は改善し，ベッド周囲のADLが向上し一時退院可能となった．リンパ節転移に関連したリンパ浮腫の治療方法は確立されておらず，放射線治療の有効性が報告されている．リンパ浮腫の診断に至るまでに他の病態を鑑別し，放射線治療によりリンパ浮腫が改善した1例を報告する．

Clinical application of laparoscopic sentinel lymph node mapping in early staged cervical cancer

Objective: To investigate the application of sentinel lymph node biopsy (SLNB) in early-staged cervical cancer by laparoscopy. Methods: It was a prospective, single-arm, single-center clinical study. Seventy-eight cases of cervical cancer patients were collected from July 2015 to December 2018 at the Fourth Hospital of Hebei Medical University. All the patients were injected with tracer into the disease-free block of cervical tissue after anesthesia by the same surgeon who learned sentinel lymph node (SLN) mapping technique in Memorial Sloan-Kettering Cancer Center, and underwent SLN mapping followed by complete pelvic lymphadenectomy. Moreover, all the dissected lymph nodes were stained with hematoxylin eosin staining (HE) pathological examination. Besides, the negative SLN on hematoxylin-eosin staining were detected by immunohistochemistry cytokeratin staining micro-metastasis. To analyze the distribution, detection rate, false negative rate the sensitivity and negative predictive value of the SLN in early-staged cervical cancer by laparoscopy, and explore the value of SLN mapping in predicting the lymph nodes metastasis in early-staged cervical cancer. Results: The overall detection rate of SLN in cervical cancer was 99% (77/78), bilateral detection rate was 87% (68/78). The average of 12.4 lymph node (LN) and 3.6 SLN were dissected for each patients each side. SLN of cervical cancer were mainly distributed in the obturator space (61.5%, 343/558), followed by external iliac (23.5%, 131/558), common iliac (7.3%, 41/558), para-uterine (3.8%, 21/558), internal iliac (2.2%, 12/558), para abdominal aorta (1.1%, 6/558), and anterior sacral lymphatic drainage area (0.7%, 4/558). Fourteen cases of LN metastasis were found among all 78 cases. There were a total of 38 positive LN, including 26 SLN metastasis and 12 none sentinel LN metastasis. Through immunohistochemical staining and pathological ultra-staging, 1 SLN was found to be isolated tumor cells (ITC), and 5 SLNs were found to be micro-metastases (MIC), accounting for 23% (6/26) of positive SLN. SLN mapping with pathological ultra-staging improved the prediction of LN metastasis in cervical cancer (2/14). Metastatic SLN mainly distributed in the obturator space (65%, 17/26), peri-uterine region (12%, 3/26), common iliac region (15%, 4/26), and external iliac region (8%, 2/26). The consistency of the diagnosis of lymph node metastasis by SLN biopsy and postoperative retroperitoneal lymph node metastasis showed that the Kappa value was 1.000 (P<0.001), indicated that the metastasis status of SLN and retroperitoneal lymph node were completely consistent. The sensitivity, specificity, accuracy, false-negative rate, and negative predictive value of SLN biopsy in the diagnosis of lymph node metastasis were 100%, 100%, 100%, 0, and 100%, respectively. Conclusions: SLN in early-staged cervical cancer patients were mainly distributed in the obturator and external iliac space, pathalogical ultra-staging of SLN could improve the prediction of LN metastasis. Intraoperative SLN mapping is safe, feasible and could predict the state of retroperitoneal LN metastasis in early-staged cervical cancer. SLNB may replace systemic pelvic lymphadenectomy.

Malignant testicular unclassified sex cord stromal tumor: a case report

BackgroundMost testicular tumors are germ cell tumors; sex cord stromal tumors are infrequent, accounting for only 3–5% of testicular tumors. Unclassified sex cord stromal tumors are extremely rare. Generally, 10% of sex cord stromal tumors are malignant. We report a case of malignant unclassified sex cord stromal tumor with retroperitoneal lymph node metastasis at first visit and a corresponding literature review.Case presentationA 72-year-old Japanese man visited our department primarily for indolent right scrotum enlargement in September 2020. Blood biochemistry examination, urinalysis, and tumor markers (alpha-fetoprotein, human chorionic gonadotropin, and lactate dehydrogenase) showed no abnormal findings. Contrast-enhanced computed tomography showed enlarged para-aortic lymph node (18 × 16 and 10 × 102 mm); a 50 × 452 mm mass with uneven contents was found in the right testicle. The patient underwent inguinal orchiectomy in September 2020. As per immunohistochemistry, the tumor cells were diffusely positive for SF-1 and Ki-67, partially positive for inhibin, and negative for CAM5.2, CK7, CK20, C-KIT, CD30, LCA, GATA-3, TTF-1, and PAX8. Calretinin was expressed in approximately 5% of tumor cells; thus, sex cord/gonadal stroma components were considered to be involved. The final pathological diagnosis was unclassified malignant sex cord stromal tumor. The patient was diagnosed with pT1, N1, M0, S0, and tumor–node–metastasis stage IIA disease. The patient received postoperative chemotherapy with four courses of etoposide and cisplatin therapy from November 2020. Post-chemotherapeutic computed tomography showed new metastatic lesions including lung, liver, pancreas, and para-aortic lymphadenopathy, which increased in size. Disease progression was observed. Cancer genome research was performed using the OncoGuide National Cancer Center oncopanel system; however, no gene mutation for which the drug could be expected to be effective was found. The patient opted for best supportive care at a nearby hospital and died from cancer progression in January 2022.ConclusionWe encountered a case of malignant testicular unclassified sex cord stromal tumor pathologically diagnosed as testicular tumor with retroperitoneal lymph node metastasis in a patient who underwent inguinal orchiectomy. Future data collection is necessary to establish multimodality therapy for malignant testicular unclassified sex cord stromal tumor.

Metastatic prostate adenocarcinoma with neuroendocrine differentiation on 18F-FDG PET/CT, 68Ga-PSMA PET/CT and 68Ga-DOTA TATE PET/CT with injected ultra-low-activity

We report the case of a 69-year-old man with prostate cancer (PC), retroperitoneal lymph node metastases, and bone metastases, who received hormone therapy to date. The patient underwent a puncture biopsy in the third thoracic vertebra and was diagnosed with metastatic prostatic acinar adenocarcinoma with partly neuroendocrine differentiation. The patient underwent three different total-body PET/CT scans at ultra-low activities to evaluate tumor heterogeneity by multiple tracers (68Ga-PSMA PET/CT, 18F-FDG PET/CT, 68Ga-DOTA TATE PET/CT). Our case suggests that total-body PET imaging with 194-cm axial FOV using a 10×reduction in injected activity can yield images that meet diagnostic needs and that the results of multi-tracer analysis are encouraging for revealing the characteristics of each lesion.

SEROUS OVARIAN CARCINOMA INITIALLY PRESENTING WITH VIRCHOW'S NODE METASTASIS: A CASE REPORT

Tumoral dissemination of ovarian cancers most commonly occurs through the intraperitoneal route, but rarely ovarian cancer also metastasis through lymphatic channels. Pelvic and retroperitoneal lymph node metastasis is usually involved. Ovarian primaries of supraclavicular metastasis are extremely rare, hence presenting this case.

Experiences and Outcomes in Olfactory Neuroblastoma Over A Decade at a Tertiary Cancer Center.

Background Olfactory neuroblastoma is a rare epithelial malignancy arising from the odorant receptors in the nasal mucosa or along the cribriform plate of the ethmoid bone. Clinical presentation includes nasal stuffiness, local pain, epistaxis, anosmia, visual impairment, proptosis, headache, and seizures. Radiologic imaging with CT or MRI, an ophthalmic evaluation, and histopathologic confirmation with immunohistochemistry are parts of the initial diagnostic workup. Although surgery, chemotherapy, and radiation have an equally important role in the management, earlier stages may preferably be treated with surgery or radiotherapy and the later stages with a multimodality approach. Materials and Methods We conducted a retrospective review of 13 patients diagnosed with olfactory neuroblastoma, registered at Mehdi Nawaz Jung Regional Cancer Center over a decade (2010-2019). We analyzed the age and sex distribution, performance status at presentation, clinical symptomatology, and the Kadish stage. In addition, the therapeutic aspects of patients were studied. Results The most common presentation noted was nasal stuffiness, followed by epistaxis and proptosis. The majority of patients had good performance status at presentation. Ten patients presented with a Kadish stage C, while the remaining patients presented with Kadish stage B. Cervical nodal metastasis was seen in three patients, four patients received multimodality treatment with neoadjuvant chemoradiotherapy followed by surgery, two patients received neoadjuvant chemotherapy followed by radiation, two patients received only surgery, and one patient received surgery followed by adjuvant radiation. Conformal radiation techniques were used to deliver doses as high as 50 to 66 Gy in 2 Gy per fraction. Two patients presented with distant metastasis during follow-up, one with bone metastasis, and the other with retroperitoneal nodal metastasis; they received palliative chemotherapy and conformal radiation to the primary site. Conclusion This study concludes that neoadjuvant chemotherapy followed by radiation gives the best outcomes. It has been observed that in multi-modality treatment, radiotherapy played a significant role in improving overall survival and better outcomes. Multidisciplinary discussions provide a better sequencing of management.

P-32 Different regimens of the 1st line chemotherapy in patients (pts) with metastatic anal cancer: Results of the multicenter observational study

Combination of paclitaxel with carboplatin and cisplatin with fluoropyrimidines are the standards of the 1st and 2nd lines of treatment in pts with metastatic anal cancer. Regimen mDCF (docetaxel 40 mg/m2 d1, cisplatin 40 mg/m2 d1, 5-FU 2400 mg/m2 46-h d1-3, two-weekly) showed promising activity in the 1st line in the nonrandomized study. We performed an analysis of a prospective multicentric database of metastatic anal cancer pts to evaluate the efficacy of different regimens as 1st line systemic treatment in a real-life clinical practice setting. We analyzed a database of pts with metastatic anal cancer in 3 cancer centers in Russia. The primary endpoints were progression free survival (PFS) and overall response rate (ORR). Analysis was performed with the SPSS v.20 software package. The study included 68 pts with metastatic anal cancer. Sixty three (93%) pts received systemic treatment; female – 87%, average age - 68 years (20-83), ECOG 0-1/2/3/NA – in 22%/33%/31%/13%; synchronous metastases - in 30%; local relapse or primary tumor – in 60%; radiotherapy or chemoradiotherapy of primary tumor were previously? administered in 70%; lung metastases in 18%, liver - 38%, retroperitoneal lymph nodes metastases – 27%; peritoneal metastases – in 3% pts; average number of metastatic zones – 2 (1-5); metastasectomy was performed in 32% pts. The first line was weekly paclitaxel and carboplatin (CP) in 29 (46%), mDCF - in 10 (16%), platinum compounds with fluoropyrimidines (CF) – in 18 (29%), others regimen – in 6 (9%). Median PFS was 6 months in CP group, 3 months – in CF group, 10 months - in mDCF group, and 3 months – in other regimens group (HR 1,02, 95% CI 0,76-1,37, p=0,8); ORR was 9%, 10%, 50%, 0%, respectively (p=0,01). In the 1st line mDCF regimen shows the best ORR and numerically the longest median PFS, which warranted conducting of prospective randomized study to compare mDCF and paclitaxel with carboplatin.