Case Of Small Cell Carcinoma Research Articles

NEUROENDOCRINE TUMORS OF THE GENITOURINARY TRACT - A CLINICAL AND PATHOLOGIC REVIEW

Abstract Introduction/Objective Neuroendocrine tumors (NETs) of the genitourinary (GU) tract are rarely seen during daily surgical pathology sign-out sessions and comprise a heterogeneous group of neoplasms. We undertook a retrospective study to assess the clinical and pathologic characteristics of this unusual group of neoplasms involving the GU tract. Methods/Case Report We performed a retrospective review of the surgical pathology files for NETs of the GU tract between July 1993 and December 2021. Chart review was performed for the clinical and pathologic findings. Results (if a Case Study enter NA) A total of 26 patients were identified. There were 18 males and 8 females ranging in age from 43 to 94 years (mean age 69 years). 19/26 (73%) cases were primary tumors; 9 bladder small cell carcinoma, 5 prostatic small cell carcinoma, 4 bladder paragangliomas, and 1 case of small cell carcinoma of the renal pelvis. 7/26 (27%) cases were metastatic tumors; 5 Merkel carcinoma (3 urinary bladders, 2 testes), and 2 small cell carcinoma of the lung to the kidney. Conclusion The majority of NETs of the GU are primary and urinary bladder to be the most common site. Merkel cell carcinoma appears to have a tendency to metastasize to the GU tract, especially to the testis.

MUC5AC immunoreactivity in scattered tumor cells is useful for diagnosing CIC-rearranged sarcoma.

CIC-rearranged sarcoma is an aggressive round cell sarcoma, and an alternative ATXN1/ATXN1L fusion has been reported. Diagnosis may be difficult, and molecular assays may suffer from imperfect sensitivity. Characteristic histology and ETV4 immunohistochemical positivity are diagnostically helpful. However, ETV4 staining is unavailable in most laboratories. Here, we explored the diagnostic utility of MUC5AC immunohistochemistry in CIC-rearranged sarcomas. All 30 cases, except one, of CIC-rearranged sarcomas and 2 ATXN1-rearranged sarcomas were positive for MUC5AC, although the number of immunopositive cells was generally low (< 5%) in most samples, representing a characteristic scattered pattern. The only MUC5AC-negative case had the lowest tumor volume. Among the 110 mimicking round cell malignancies, 12 tumors showed MUC5AC positivity, including occasional cases of synovial sarcoma and small cell carcinoma, whereas the remaining 98 samples were negative. Despite its lower specificity than that of ETV4 and sparse reactivity that requires careful interpretation, MUC5AC may serve as a useful marker for CIC/ATXN1-rearranged sarcoma because of its wider accessibility.

Utility of SHOX2 and RASSF1A gene methylation detection on the residual cytology material from endobronchial ultrasound-guided transbronchial needle aspiration.

This study aims to assess the effectiveness of Short Stature Homeobox 2 (SHOX2) and RAS Association Domain Family 1 Isoform A (RASSF1A) gene methylation detection in residual liquid-based cytology (LBC) materials from Endobronchial Ultrasound-Guided Transbronchial Needle Aspiration (EBUS-TBNA) and investigate the diagnostic accuracy of a comprehensive diagnostic approach. Between June 2022 and May 2023, a total of 110 cases that underwent EBUS-TBNA were enrolled in the study. SHOX2 and RASSF1A genes methylation detection using the residual cytological material, LBC, and cell block (CB) were conducted for each EBUS-TBNA case. The sensitivity and specificity of cytology, CB histopathology, SHOX2, and RASSF1A methylation in diagnosing EBUS-TBNA samples were determined based on follow-up data. Among the 72 cases confirmed as pulmonary carcinomas, the methylation test yielded positive results in 24 adenocarcinoma cases, 10 squamous cell carcinoma cases, and 14 small cell carcinoma cases. The sensitivity of the comprehensive diagnosis (combining LBC, CB, and methylation detection) in distinguishing metastatic pulmonary epithelial malignancies in mediastinal and hilar lymph nodes or masses from benign lesions was higher (97.22%, 70/72) than that of morphological diagnosis alone (LBC and CB) (88.89%, 64/72; P < 0.05). SHOX2 and RASSF1A methylation detection demonstrates a high sensitivity and negative predictive value in the identification of pulmonary epithelial malignancies and holds promise as a valuable ancillary approach to enhance morphological diagnosis of EBUS-TBNA.

Primary Small Cell Carcinoma of Hypopharynx-A Case Report of a Rare Tumor from a Tertiary Care Hospital in India

Introduction. Primary hypopharynx involvement of small cell carcinoma is very rare and very few cases have been reported in the texts. Here, we report a case of primary small cell carcinoma of hypopharynx with metastases to left humerus in a female patient of north india. Case Report. A 54 year old woman presented with a 4month history of shortness of breath and neck swelling in the left side. Fibreoptic laryngoscopy and biopsy revealed small cell carcinoma of the hypopharynx. Discussion. Small cell carcinoma of the hypopharynx still does not have any clear modality of treatment due to being a rare entity. Systemic chemotherapy and radiotherapy should be preferred over other treatment modalities.

Analysis of 25 surgical cases of thymic neuroendocrine tumors and thymic carcinoma

BackgroundThe purpose of this study was to evaluate the clinicopathological characteristics of patients who underwent surgical resection for thymic neuroendocrine tumors (TNET) or thymic carcinoma.MethodsIn this study, we retrospectively evaluated the clinicopathological characteristics of our surgical patients at Fukuoka University Hospital from January 1995 to December 2018.ResultsThere were nine cases of TNET and 16 cases of thymic carcinoma. Regarding the pathological type, the TNET group included three atypical carcinoid cases, two large cell neuroendocrine tumor cases, two small cell carcinoma cases, and two other cases. The thymic carcinoma group included 15 squamous carcinoma cases and one case of adenosquamous carcinoma. Based on the Masaoka-Koga staging system, six TNET cases and 11 thymic carcinoma cases were stage III or IV. The complete resection rate was 77% in the TNET group and 81% in the thymic carcinoma group. Additional chemotherapy and/or radiotherapy was performed in five cases of TNET and 11 cases of thymic carcinoma. The five-year survival rate and five-year disease-free survival rate were 87.5% and 75.0% in the TNET group and 58.9% and 57.1% in the thymic carcinoma group, respectively, with no significant difference between the two groups (P = 0.248 and P = 0.894, respectively). In the univariate analysis, complete resection was a statistically significant prognostic factor (P = 0.017).ConclusionIn this study, no difference in prognosis was observed between TNET and thymic carcinomas. To understand the characteristics of these tumors, further case accumulation and multicenter clinical studies are needed. (243words)

Small cell carcinoma esophagus-A tertiary cancer center experience of a rare variant.

Esophageal cancer is quite prevalent worldwide and usually carries a poor prognosis. Histologically, although squamous cell carcinoma and adenocarcinoma predominate, small cell carcinoma (SmCC) cases have been reported. Overall, there is a paucity of literature regarding this variant. In this article, we aim to highlight this uncommon entity of carcinoma esophagus and share our experience of SmCC patients seen over a decade at our institute. Records of patients with SmCC histology from 2010 to 2020 were assessed. Patients' demographic characteristics, clinical characteristics, treatment received, and outcomes were taken into consideration. Results were analyzed statistically using SPSS version 22. Fourteen patients (nine males and five females) with a median age of 57 years (range: 35 - 72 years) were analyzed. The majority of the patients 10/14 (71.4%) received palliative radiotherapy of either 30Gy/10 fractions or 35Gy/15 fractions. Only 1/14 (7.14%) patients received neoadjuvant chemotherapy and concurrent chemoradiation (CCRT). Overall, partial response was noted in all 11 patients (78.6%) who received treatment. The average median survival was 5 months (range: 1-11 months). Although the small sample size of the study prevents us from drawing a firm conclusion, we propose national and international collaborative prospective studies for framing definitive oncologic management strategies for this rare histological variant of esophageal cancer.

Neuroendocrine and squamous cell phenotypes of NUT carcinoma are potential diagnostic pitfalls that discriminating it from mimickers, such as small cell and squamous cell carcinoma

IntroductionNUT carcinoma is a rare cancer associated with a poor prognosis. Because of its rarity, its diagnosis is challenging and is usually made by excluding other diagnoses. Immunohistochemical analysis is a reliable technique that contributes to a correct diagnosis, but overestimating the expression of neuroendocrine (NE) markers may result in an incorrect diagnosis. In this study, we established the immunohistochemical phenotypes of NUT carcinoma compared with tumors that mimic its phenotype to identify potential diagnostic pitfalls.MethodsEight cases of NUT carcinoma were examined along with eight basaloid squamous cell carcinomas and thirteen cases of small cell carcinoma using an immunohistochemical panel consisting of various antibodies.ResultsOf the eight NUT carcinomas, three patients had a smoking history. All the cases examined for INSM1 were positive (6/6, 100%), although the staining was somewhat weak. Among the NE markers, synaptophysin was variably positive in two NUT carcinomas (2/6, 33%); however, all cases were negative for ASCL1, chromogranin A, and CD56. Moreover, the squamous cell markers, p40 and CK5/6, were weakly expressed in 4/6 (67%) and 3/6 (50%) of the NUT carcinomas, respectively.ConclusionsFor tumors with an ambiguous morphology, applying the neuroendocrine phenotype of NUT carcinoma may be misleading; particularly, when distinguishing it from small-cell carcinoma. Similarly, null or weak expression of squamous cell markers may be observed in NUT carcinoma, but this differs from squamous cell carcinoma, which consistently demonstrates strong positivity for squamous cell markers.

Multidisciplinary treatment for small cell carcinoma of the bladder: a case report.

Small cell carcinoma (SCC) of the urinary bladder is a rare and highly aggressive subtype of bladder cancer. Most cases are diagnosed at advanced stages, and its therapeutic strategy remains unestablished. Here, we report a case of bladder SCC in which multidisciplinary treatment has resulted in relatively long-term survival. A 68-year-old man presented with gross hematuria. A cystoscopy revealed an invasive bladder tumor. A transurethral resection of bladder tumor (TURBT) was performed, and the pathological diagnosis was SCC. After systemic chemotherapy using etoposide and carboplatin and subsequent TURBT, a radical cystectomy and ileal conduit were performed. Three months postoperatively, the patient had a recurrence in the para-aortic lymph node. Systemic combination chemotherapy with carboplatin plus irinotecan (CBDCA + CPT-11) was administered, followed by amrubicin and an immune checkpoint inhibitor. In addition to this treatment, radiation therapy for the metastatic region led to the reduction of pain and shrinkage of the metastatic lesion. The patient survived for 2years after the initial diagnosis. Our report indicates that multidisciplinary treatment can be effective for SCC of the bladder, and a therapeutic strategy including the identification of novel biomarkers should be established.

Clinicopathological and Immunohistochemical Analysis of Lung Cancer Biopsies at a Tertiary Care Centre in Central Gujarat, India

Introduction: Lung biopsy is a reliable and highly accurate tool for diagnosing and subtyping lung lesions. Two-thirds of lung cancer patients present with advanced disease, and small biopsies remain the main diagnostic tool. Histopathological and immunohistochemical examination of lung biopsies plays an important role in accurately diagnosing lung malignancies. Aim: The aim of present study was to analyse the clinicopathological and immunohistochemical features of lung cancer. Materials and Methods: This cross-sectional study was conducted in the Department of Pathology, Medical College, Baroda, over a period of two years and three months, from March 2019 to May 2021. A total of 53 cases of malignant lung cancer biopsies were included in this study. Clinical parameters, such as patient age, complaints, smoking history, clinical presentation, radiological findings, histopathology reports, and IHC findings, were retrieved. All cases underwent histopathological examination, and tumour typing was done according to the WHO classification 2021 of lung tumours. Immunohistochemistry (IHC) markers like CK5/6, CK7, TTF1, P63, synaptophysin, chromogranin, and pankeratin were used for further subtyping. Data analysis was done by Microsoft Excel 2019 spreadsheet. Results: A total of 53 cases of malignant lung cancer were included in this study. Of these, 38 (71.69%) cases were male, and 15 (28.30%) cases were female. 43 (81.13%) cases were over 50 years old, with a mean age of 61 years. After IHC, adenocarcinoma was seen in 27 cases (50.9%), followed by Squamous Cell Carcinoma (SCC) in 19 cases (35.8%), five cases of small cell carcinoma, one case of large cell neuroendocrine carcinoma, and one case of Non Small Cell Carcinoma-Not Otherwise Specified (NSCC-NOS). In adenocarcinoma, positivity for CK7, TTF1, and p63 was 100%, 74.07%, and 16.6%, respectively. In squamous cell carcinoma, positivity for CK5/6 and p63 was 100% and 78.94%, respectively. Conclusion: In the present study, the majority of cases were males. Adenocarcinoma was the most common subtype of Non Small Cell Lung Cancer (NSCLC). A panel of IHC markers is helpful in differentiating NSCLC into adenocarcinoma and squamous cell carcinoma on small true-cut lung biopsies. CK5/6 and p63 aid in detecting squamous cell carcinoma, while CK7 and TTF-1 help in detecting adenocarcinoma. The recommended immunohistochemical profile for NSCLC includes TTF1, CK5/6, CK7, and p63.

Primary Small Cell Neuroendocrine Carcinoma of Bladder – A Rare Diagnostic Entity

Primary small cell carcinoma of the bladder is very rare pathological entity, follows an aggressive course and carries poor prognosis. The literature carrying these articles are scarce and due to which it poses a diagnostic challenge to the radiologist and urologists. Herein, we present a case of small cell carcinoma of urinary bladder in a 75 year old male patient initially reported as poorly differentiated urothelial carcinoma on transurethral resection of bladder tumor specimen to emphasize its rarity as well as the role of immunohistochemistry to differentiate between the two.

S4100 A Case of Metastatic Small Cell Carcinoma With Small Bowel Primary

S4100 A Case of Metastatic Small Cell Carcinoma With Small Bowel Primary

Intracranial dissemination in a primary small cell carcinoma of the brain: a case report and literature review.

Primary intracranial small cell carcinoma (SCC) is extremely rare with only 8 previously reported cases. We describe a case of primary intracranial SCC with intracranial metastasis. A 46-year-old man presented with decreased vision and a red and swollen left eye. Brain magnetic resonance imaging (MRI) revealed a heterogeneously enhanced tumor on the left frontal lobe. Preoperative systemic computed tomography (CT), MRI, and positron emission tomography (PET)-CT revealed no extracranial tumors. The tumor on the left frontal lobe was excised. Immunohistochemical staining on the excision showed positivity for CD56, synaptophysin (Syn), cytokeratin (CK), and Ki-67 (30%), and negativity for thyroid transcriptional factor-1 (TTF-1), glial fibrillary acidic protein (GFAP), B-cell lymphoma 6 (Bcl-6), multiple myeloma oncogene 1 (MUM-1), C-Myc, Vimentin, P40, P53, CK7, CD3, CD5, CD20, CD79a, CD10, and CD23. The pathological examination strongly suggested that the tumor was a primary intracranial SCC. One year after the surgery, the patient was readmitted with slurred speech and slow movements. Three well-defined tumors were found in the left upper frontal lobe by brain MRI. Tumor resection was then performed. Further immunohistochemical examination of the excised tissue displayed the same pattern as previously, indicating the recurrence of intracranial SCC in the left frontal lobe. The patient received adjuvant chemotherapy and radiotherapy after the tumor resection. At the 2-year follow-up, he remained asymptomatic.

COMPUTED TOMOGRAPHY IN DIFFERENTIATION BETWEEN SMALL CELL AND NON SMALL CELL CARCINOMA LUNG

Background :- Lung carcinoma is common in the developed world as well as developing world with high morbidity and mortality. It is broadly classified into two categories as small cell and non small cell carcinoma, in which radiological imaging plays a critical role in diagnosing and staging of cancer. Multi Detector computed tomography (MDCT) is the investigation of choice for evaluation of lung carcinomas. - The objectives of our study is radiologi Objectives: cal assessment of difference in size and location of primary and metastatic spread at presentation in histologically proven cases of small cell vs non small cell carcinoma of lung. This study comprised of patients who Material And Methods: presented to the department of radiodiagnosis Shri Ram Murti Smarak Institute Of Medical Science a tertiary care center of west Uttar Pradesh, for CT scan of thorax, with clinical symptomsand / or radiographic suspicion of lung cancer and cytohistopathological diagnosis of lung cancer over the period of two years. : In the present Observations And Results study a total of 84 patients were included. The non small cell carcinoma patients were 66(78.5%) which included Squamous cell carcinoma(40%) and adenocarcinoma (38%) and 18(21.4%) patients were of small cell carcinoma. On CT imaging non small cell carcinoma had larger size at presentation as compared to small cell carcinoma. Small cell carcinoma was more frequently associated with distant metastasis (77% cases) and mediastinal lymphadenopathy (100% cases) as compared to non small cell carcinoma

Severe hyponatremia as presenting symptom of small cell lung carcinoma

Abstract A 62-year-old female patient was admitted to ICU in our clinic with symptomatic severe hyponatremia with complaints of fatigue, vertigo, paresthesia of upper extremities and three episodes of loss of consciousness in the past month. She had been hospitalized two weeks before in neurology clinic because of the same symptoms. CT of the brain, EEG, ophthalmology examinations were negative. She did not complain of hemoptysis, cough, weight loss, fever, chest pain or dyspnea. Nephrologist was consulted and renal origin of the hyponatremia was excluded, before admission. Initial laboratory tests were glucose:5,47 umol/L,sodium:109 mEq/L,potassium;4.5 mEq/L,urea 3,9 umol/l;creatinine:52,7 mol/l,calcium:1,22umol/L,TSH 5;Cortisol 819nmol/L;ACTH:16,34 pg/ml. Her medical history included hypertension, primary hypothyroidism and history of smoking. Upon laboratory findings of low serum osmolality, high urine osmolality, high urine sodium levels and clinical euvolemia, and in the absence of renal, pituitary disfunction, adrenal insufficiency, inappropriate ADH syndrome was diagnosed and initially was treated with 3% NaCl. Since this treatment had no effect, it was started with fluid restriction, per os sodium intake was increased and therapy with loop diuretic was initiated, which resulted in correction of the hyponatremia. For the etiology consideration of inappropriate ADH syndrome CT of the thorax was performed, which revealed a neo infiltrative process with atelectasis in the poster basal segment of the left lobe. Histopathological sampling from the biopsy of the mass revealed small cell carcinoma of the lung. Metastasis were not detected. Since basal morning cortisol level was above upper range, with inappropriate measurements of ACTH constantly above 15 pg/ml, additional tests for ectopic Cushing syndrome were done. Overnight 1mg dexamethasone suppression test showed absent suppression of the morning cortisol values of 656nmol/L and ACTH of 22,14 pg/ml and absent circadian rhythm of cortisol secretion, with high measurements of midnight serum cortisol of 652 nmol/L. Diagnosis of ectopic Cushing syndrome and SIADH as part of paraneoplastic syndrome in small cell lung carcinoma was made. It is to be noted that patient had no significant symptoms or signs of hypercortisolemia. We report here a case of small cell carcinoma of the lung whose first presentation was with symptomatic hyponatremia as a result of inappropriate ADH syndrome. The most common neoplasms associated with hyponatremia are various forms of lung cancer. Because of the aggressive nature of the disease, the most common manifestation of small cell carcinoma of the lung is a metastatic one. Therefore, identifying the disease in earlier stages is very important. Unfortunately, these patients have low rates of survival and face a very poor prognosis even with treatment. The presence and early identification of paraneoplastic syndromes can be beneficial in this context.

A Case of Small Cell Carcinoma of the Ovary, Hypercalcemic Type Combined with Low-Grade Serous Carcinoma

A Case of Small Cell Carcinoma of the Ovary, Hypercalcemic Type Combined with Low-Grade Serous Carcinoma

Bronchoalveolar Lavage in Diagnostic Evaluation of Pulmonary Diseases- An Institutional Experience.

Bronchoalveolar lavage (BAL) is a widely accepted investigative tool for the diagnosis of pulmonary lesions. This study was done to find out the usefulness of BAL in diagnosis of pulmonary lesions from central Indian patient population. A cross-sectional prospective study was performed over a period of three years. All the BAL specimens of patients presenting to Department of Pulmonary Medicine and Tuberculosis during a period of January 2017 to December 2019 were included in the study. Cyto-histopathologic correlation was done, wherever available. Of total 277 cases, there were 178 (64.5%) males and 99 (35.5%) females. The age of patients ranged from 4 years to 82 years. In 92 (33%) cases, specific infective etiology could be identified on BAL cytology, the most common being tuberculosis (26%) followed by fungal infections (2%). Rarely, infections like nocardia, actinomycosis, and hydatidosis were also identified. Eight cases (3%) of malignancy were identified which included two cases of adenocarcinoma, one case of small cell carcinoma, three cases of poorly differentiated carcinoma, and two cases suspicious for malignancy. Some rare diagnoses like diffuse alveolar damage, pulmonary alveolar microlithiasis, and pulmonary alveolar proteinosis could be identified on BAL. BAL is useful in primary diagnosis of infections and malignancies of lower respiratory tract. BAL may aid in diagnostic workup of diffuse lung diseases. A combination of clinical information, high-resolution computed tomography, and BAL analysis may furnish an assured diagnosis to the clinician and obviate need for invasive procedures.

A Case of Primary Small Cell Carcinoma of the Breast Treated with PD-L1 Inhibitor Combination Therapy as with Small Cell Lung Cancer

A Case of Primary Small Cell Carcinoma of the Breast Treated with PD-L1 Inhibitor Combination Therapy as with Small Cell Lung Cancer

Accuracy of Classifying Lung Carcinoma Using Immunohistochemical Markers on Limited Biopsy Material: A Two-Center Study.

Introduction Accurate classification of lung cancer into primary and metastatic carcinomas is critical for treatment approaches. Immunohistochemistry (IHC) has always been pivotal in unveiling the diverse cell differentiation lineages present in lung cancer by using specific biomarkers such as TTF1 and p63/p40, which closely reflect the relationship between genotype and phenotype.. Methods A retrospective cross-sectional study was conducted to evaluate 57 Tru-Cut biopsies over two years, from 2020-2022. Tumour morphology was evaluated, and IHC for TTF-1, Napsin A, CK-7,P-63, P-40, and CD-56 was performed in two steps. Results Of the lung cancer cases,58.5% were adenocarcinoma (ADC), 24.5% were squamous cell carcinoma (SCC), 9.4% were small cell carcinoma, and 7.5% were poorly differentiated carcinoma. TTF1 stain had sensitivity and specificity of 78.9% and 50% in 33 cases of ADC, respectively, while CK7 and Napsin A had 100% sensitivity. P63 stain had 77% sensitivity and 50% specificity in 15 cases of SCC, while P-40 had 100% sensitivity. The CD56 stain was 100% sensitive in five cases of small cell carcinoma. Conclusion IHC staining on small lung biopsies allows accurate sub-classification of poorly differentiated lung cancers; however, there is still significant variability. Surgical resection specimens can be further classified due to architectural features that biopsies lack. Morphological findings would be beneficial in the development of an algorithm for sub-classifying lung carcinoma using a variety of markers.

Clinical analysis of 12 cases of laryngeal neuroendocrine carcinoma

Objective: To investigate the clinical and pathological features, treatments and prognosis of laryngeal neuroendocrine carcinoma (LNEC). Methods: We conducted the retrospective analysis of the clinical data of 12 patients with LNEC admitted to the Department of Otorhinolaryngology Head and Neck Surgery, Second Hospital of Shanxi Medical University from May 2014 to December 2021, including 9 males and 3 females, aged 50-77 years. There were 4 cases of typical carcinoid tumour (highly differentiated), 5 cases of atypical carcinoid tumour (moderately differentiated) and 3 cases of neuroendocrine small cell carcinoma (hypofractionated). The clinical features, diagnosis, treatment and prognosis of LNEC were analysed. Results: The clinical manifestations of LNEC varied according to the tumour type but did not correlate with the pathological types. The supraglottic type was characterized by sore throat, foreign body sensation in the pharynx, coughing, obstructive sensation when eating and choking on water. The treatments were determined according to the pathological types, lesion location and invasion scope. Of 12 patients 4 underwent horizontal partial laryngectomy plus elective lymphatic dissection plus postoperative radiotherapy/chemotherapy, 4 underwent vertical partial laryngectomy (3 of them with cervical lymphatic dissection), 3 underwent supported laryngoscopic plasma laryngectomy for laryngeal cancer, and 1 abandoned for treatment. With the follow-up of 8 -78 months, 5 patients were alive, 1 died from chemotherapy reactions, 3 died from other diseases, 1 died from lung metastasis, 1 died from lung infection and 1 was lost to follow-up. Conclusion: LNEC is clinically rare, the clinical manifestations are less specificity, diagnosis relies on pathological and immunohistochemical examinations, and treatment modalities and prognoses are closely related to the pathological subtypes of LNEC.

S2223 A Rare Case of Sporadic Metastatic Rectal Small Cell Carcinoma With Primary Biliary Cholangitis

S2223 A Rare Case of Sporadic Metastatic Rectal Small Cell Carcinoma With Primary Biliary Cholangitis