Negative E-cadherin expression on bone marrow myeloma cell membranes is associated with extramedullary disease.

Background: The loss of E-cadherin expression and the induction of N-cadherin are known as hallmarks of the epithelial-to-mesenchymal transition, an essential initial step in the process of metastasis in solid tumors. Although several studies have reported expressions of these cadherins in patients with multiple myeloma (MM), their clinical significance is unknown as MM cells are non-epithelial. Methods: In this study, we examined the expression of E- and N-cadherins by immunohistochemistry using bone marrow (BM) biopsy specimens from 31 newly diagnosed MM patients and in subsequent biopsy specimens from six of these. Results: Negative E-cadherin expression on BM myeloma cell membranes was significantly associated with the presence of soft-tissue masses arising from bone lesions and breaking through the cortical bone, referred to as extramedullary disease (EMD). Conclusions: Given the aggressive nature of EMD, our study suggests that screening for E-cadherin using BM immunohistochemistry is one measure that could predict the development of EMD in patients with MM.

[PAX5-positive plasma cell leukemia presenting as lymphocytosis].

An 82-year-old Japanese male patient was initially diagnosed with lymphocytosis. His complete blood count revealed a white blood cell count of 30.9×109/l with 81% abnormal lymphocytes. The abnormal lymphocytes included monoclonal clones of CD38+ and CD138+cytoplasmic κ+ and IgG-κ M-protein, which led to the final diagnosis of plasma cell leukemia (PCL). Bortezomib and dexamethasone therapy was initiated, but the patient succumbed to the disease on the 8th day of hospitalization. A cytogenetic examination revealed a t (9;14)(p13;q32) translocation and the Western blotting confirmed high PAX5 expression. Similar to our present case, PCL cases with "lymphocytosis" have been widely reported, which some speculating the involvement of PAX5 overexpression in the pathogenesis. Such cases, including ours, may be classified as a unique group of disorders (PCL presenting as "lymphocytosis"), which requires accurate differential diagnosis and subsequent urgent multidisciplinary intensive treatment.

[A Case of Fournier's Gangrene during Second-Line IRIS plus Bevacizumab Chemotherapy for Rectal and Anal Canal Cancer].

A 52-year-old man diagnosed with Stage ⅢA rectal and anal canal cancer underwent abdominal perineal resection using Miles's method. Two years later, local recurrence and lung metastases were detected using contrasted CT imaging. First-line chemotherapy of XELOX was administered for 4 months until the disease progressed and lung metastases developed. After 4 courses of second-line IRIS plus bevacizumab chemotherapy, fever and swelling of the right buttock appeared; he visited and was admitted to our hospital. A CT scan revealed a pelvic abscess which resulted in septic shock. Swelling and pain extended to the right scrotum, and acute necrotizing fasciitis was suspected, and emergency surgery was performed. An incision was made from the right buttock to the right scrotum, bloody purulent drainage with a foul odor was observed, and a diagnosis of Fournier's gangrene was made. Although typical CT findings such as emphysema due to gas-producing bacteria were not observed in this case, early diagnosis and intervention of systemic management including early surgical drainage and operation were effective. For pelvic infections occurring during bevacizumab chemotherapy, Fournier's gangrene should considered for differential diagnosis, even if CT findings are atypical.

[A Case of Superior Vena Cava Syndrome Due to Recurrent Breast Cancer Effectively Treated by Trastuzumab Deruxtecan].

A 64-year-old female underwent Bt+Ax surgery due to ER(-), PR(-), HER2(+), ycT3N1M0, Stage ⅢA right breast cancer. After cancer recured in the chest wall, whole-breast radiation therapy was performed, followed by ddAC, and T- DM1. After 12 courses of T-DM1, CT scan and physical findings showed no evidence of metastases, so chemotherapy was suspended with strict follow-up. Seven months later, a chest wall recurrence with pleural dissemination was found and 9 courses of PER plus HER plus eribulin therapy was administered until disease progression. T-DM1 was re-administered but disease progressed after 2 courses accompanied by SVC syndrome due to 8 cm mediastinal lymph node metastasis which caused respiratory discomfort and face edema. We administered T-DXd and after the first course respiratory symptoms vanished, and after 3 courses lymph node metastasis shrunk extremely in the CT imaging. SVCS is one of the oncologic emergencies, in which palliative radiotherapy may be typically selected for the relief of symptoms, and intravascular stents are used in urgent cases. Surprisingly, we experienced a case of SVC syndrome caused by breast cancer metastasis, effectively treated by T-DXd.

Focal neuroendocrine carcinoma mixed with adenocarcinoma of the gallbladder with aggressive lymph node metastasis in a patient who did not meet the mixed neuroendocrine-non-neuroendocrine neoplasm criteria.

A 70-year-old Japanese woman who was treated for interstitial pneumonia (IP) with steroid therapy developed cholecystitis. A serial computed-tomography (CT) imaging showed irregular thickness of the fundus wall of the gallbladder and two rapidly enlarged lymph nodes (LNs): number (no.) 12 and no. 8a. Positron-emission tomography-computed tomography (PET-CT) scan showed an abnormal uptake at the site of the gallbladder tumor and those LNs. We subsequently performed open radical cholecystectomy and LN dissection of the no. 12 and 8a LNs, following complete remission of IP. The histology showed gallbladder adenocarcinoma, with a single focus of neuroendocrine carcinoma (NEC) component of less than 30%; Ki-67 index > 80%, synaptophysin (Syn) (+), chromogranin A (CgA) (+), and clusters of differentiation (CD) 56 (+) (T2bN1M0, Stage IIIB). LN no. 8a was diffusely metastatic with NEC components. LN no. 12c, which was adjacent to the cystic duct, revealed necrosis without apparent tumor cells, but was highly suspicious for tumor necrosis. The final diagnosis was adenocarcinoma of the gallbladder with focal NEC (< 30%), which did not meet the criteria for mixed neuroendocrine-non-neuroendocrine neoplasm (MiNEN). Postoperatively, she completed 4 cycles of adjuvant chemotherapy for NEC (Cisplatin plus Etoposide), and no recurrence was observed after 12 months.

[A Case of an Advanced Intrahepatic Cholangiocarcinoma Effectively Treated by Conversion Surgery after Neoadjuvant Chemotherapy of Gemcitabine, Cisplatin and S-1].

A 61-year-old male suffered from intrahepatic cholangiocarcinoma in S7 lesion(90 mm diameter), diagnosed by hepatic tumor biopsy. As PET-CT showed para-aortic lymph node metastasis(cT3N1M1, cStage ⅣB), and judged to be unresectable, he received neoadjuvant chemotherapy of gemcitabine, cisplatin, and S-1(GCS). After 7 courses of GCS, CT showed partial response of the primary tumor and PET-CT showed decreased accumulation of FDG at para-aortic lymph node. Resectability was reexamined and the patient underwent S7 extended subsegmentectomy as conversion surgery. Furthermore, after the surgery, he received adjuvant chemotherapy of S-1 for 6 months, and he remained relapse-free for the next 2 years. Cholangiocarcinoma is one of the most poorly prognosed type cancer. Conversion surgery for unresectable intrahepatic cholangiocarcinoma is frequently reported, but there are still few reports of GCS as neoadjuvant chemotherapy. Here, we report a case of unresectable intrahepatic cholangiocarcinoma that was successfully treated with GCS and underwent conversion surgery.

Trousseau's Syndrome Presenting as Multiple Cerebral Infarctions Caused by Mucin-producing Bladder Micropapillary Urothelial Cancer.

We herein report a 70-year-old man with recurrent multiple cerebral infarctions under warfarin therapy who was finally diagnosed with Trousseau's syndrome resulting from advanced bladder cancer. A histological examination of the mesenteric lymph nodes revealed metastasis of micropapillary urothelial cancer with positive mucin markers CA125 and MUC1. Blood examinations also indicated elevated tumor markers, such as CA19-9 and CA125. To our knowledge, this is the first report of Trousseau's syndrome in a patient with bladder micropapillary urothelial cancer in which mucin involvement was clearly proven by histological and serological examinations.

A Case of Guillain-Barré Syndrome and Stevens-Johnson Syndrome/Toxic Epidermal Necrosis Overlap After Pembrolizumab Treatment.

A 76-year-old man was admitted to our hospital with Guillain-Barré syndrome (GBS), presenting with facial palsy, dysarthria, and dysphagia as Grade 3 immune-related adverse events (irAEs) due to pembrolizumab administration for Stage IV lung adenocarcinoma. Although prednisolone (1 mg/kg) was started for GBS due to the irAE, dark erythema and skin eruptions appeared on the patient's torso. Then erosion was observed on 18% of the body surface area and skin biopsy was performed. Finally, the patient was diagnosed with Stevens-Johnson syndrome/toxic epidermal necrosis overlap. Intravenous immunoglobulin therapy was started, and the skin symptoms improved, with the erosion becoming epithelial. He died of aspiration pneumonia related to GBS, although his neurological symptoms had improved after steroid and intravenous immunoglobulin therapy. This is the first reported case of pembrolizumab-induced GBS and Stevens-Johnson syndrome/toxic epidermal necrosis overlap. It is necessary to be careful that the possibility of other severe irAEs may occur simultaneously.

Upregulation of FGF9 in Lung Adenocarcinoma Transdifferentiation to Small Cell Lung Cancer.

Transdifferentiation of lung adenocarcinoma to small cell lung cancer (SCLC) has been reported in a subset of lung cancer cases that bear EGFR mutations. Several studies have reported the prerequisite role of TP53 and RB1 alterations in transdifferentiation. However, the mechanism underlying transdifferentiation remains understudied, and definitive additional events, the third hit, for transdifferentiation have not yet been identified. In addition, no prospective experiments provide direct evidence for transdifferentiation. In this study, we show that FGF9 upregulation plays an essential role in transdifferentiation. An integrative omics analysis of paired tumor samples from a patient with transdifferentiated SCLC exhibited robust upregulation of FGF9. Furthermore, FGF9 upregulation was confirmed at the protein level in four of six (66.7%) paired samples. FGF9 induction transformed mouse lung adenocarcinoma-derived cells to SCLC-like tumors in vivo through cell autonomous activation of the FGFR pathway. In vivo treatment of transdifferentiated SCLC-like tumors with the pan-FGFR inhibitor AZD4547 inhibited growth. In addition, FGF9 induced neuroendocrine differentiation, a pathologic characteristic of SCLC, in established human lung adenocarcinoma cells. Thus, the findings provide direct evidence for FGF9-mediated SCLC transdifferentiation and propose the FGF9-FGFR axis as a therapeutic target for transdifferentiated SCLC. SIGNIFICANCE: This study demonstrates that FGF9 plays a role in the transdifferentiation of lung adenocarcinoma to small cell lung cancer.

A case of hyperprogressive disease following atezolizumab therapy for pulmonary pleomorphic carcinoma with epidermal growth factor receptor mutation.

A 66-year old man with non-smoking history was diagnosed with pulmonary pleomorphic carcinoma of the right lower lobe. The carcinoma metastasized to the brain, lungs, pleura, and mediastinal lymph nodes. It was positive for epidermal growth factor receptor (EGFR) L858R mutation, and tumor cells highly expressed programmed death-ligand 1(PD-L1). Atezolizumab was initiated as the fourth treatment. After three days, he developed cardiac tamponade and immediately underwent pericardial drainage. Computed tomography showed bilateral ground-glass opacity (GGO), significant worsening of multiple lung metastases, and increased size of metastatic lesions. Newly developed metastasis was noted in the lung, and the patient's respiratory condition rapidly deteriorated. He died of respiratory failure on day 13 after atezolizumab administration. The autopsy showed widespread metastasis in all lobes of the bilateral lungs, cardiac tamponade due to carcinomatous pericarditis, carcinomatous lymphangiopathy, and multiple lung metastases, which were thought to be comprehensively the cause of death. These symptoms suggested hyperprogressive disease (HPD). Hence, we report the first case of HPD following atezolizumab therapy for pulmonary pleomorphic carcinoma with EGFR mutation.

A Case of Intravascular Diffuse Large B-Cell Lymphoma Initially Suspected as Interstitial Pneumonia Associated With Systemic Scleroderma.

Intravascular large B-cell lymphoma (IVLBCL) is a rare form of diffuse LBCL. The patient was a 71-year-old female admitted to our hospital with hypoxia. On admission, chest computed tomography revealed a ground-glass opacity. Interstitial pneumonia associated with systemic scleroderma was suspected because of positive anti-centromere antibody. Thereafter, steroid pulse therapy and plasma exchange were performed. Although ground-glass opacity improved, bilateral pleural effusion appeared, so we performed a random skin biopsy because of her elevated serum lactate dehydrogenase and soluble interleukin-2 receptor levels. The patient was diagnosed with IVLBCL with symptoms improving after 6 cycles of rituximab plus chemotherapy treatment.

Glomerulonephritis Caused by Bartonella spp. Infective Endocarditis: The Difficulty and Importance of Differentiation from Anti-neutrophil Cytoplasmic Antibody-related Rapidly Progressive Glomerulonephritis.

A 65-year-old man with valvular disorder presented to his physician because of widespread purpura in both lower extremities. Blood tests showed elevated serum creatinine levels and proteinase 3-anti-neutrophil cytoplasmic antibody (ANCA) with hematuria, suggesting ANCA-related rapidly progressive glomerulonephritis (RPGN). Although multiple blood cultures were negative, transthoracic echocardiography revealed warts in the valves, and a renal biopsy also showed findings of glomerular infiltration by mononuclear leukocytes and C3 deposition in the glomeruli, suggesting infection-related glomerulonephritis. Later, Bartonella antibody turned positive. Antimicrobial treatment improved the purpura and renal function without any recurrence. ANCA-positive RPGN requires the exclusion of infective endocarditis, especially that induced by Bartonella spp.

[Incidence of Secondary Malignancy of Chronic Myeloid Leukemia during Treatment of Breast Cancer with Hormone Therapy].

It is expected that the number of long-term breast cancer survivors will increase owing to the improvements in chemotherapy and irradiation, while the risk of double cancers, including secondary malignancy, may become an issue. There are many unclear points in the treatment policy with regard to when a secondary malignancy occurs or the primary cancer relapses during the management of a secondary malignancy. A 54-year-old woman who was diagnosed with ER/PgR-positive HER2 negative breast cancer Stage ⅢB received neoadjuvant chemotherapy FEC and docetaxel followed by breast surgery, adjuvant hormone therapy, and radiation therapy. Chronic myeloid leukemia diagnosed by the abnormal findings of leukocytosis and bone marrow aspiration emerged after 3 years of the diagnosis of the first breast cancer. After 3 years of imatinib therapy that achieved a major molecular response(MMR)of CML, a recurrence of sacral metastasis of breast cancer was revealed by MRI. The combination of imatinib and hormone or S-1 chemotherapy could be maintained without serious adverse events after the relapse of the primary cancer.

[A Case of Advanced Esophageal Cancer Discovered Due to Suffocation, Which Was Invasive to the Trachea and Internal Carotid Artery and Treated by Chemotherapy].

A 51-year-old male presented with dyspnea due to upper airway obstruction. We decided to perform a cricothyroidotomy due to difficulty in performing orotracheal intubation. A CT scan revealed a massive tumor infiltrating into the right side of the neck, which penetrated the internal carotid artery. An upper gastrointestinal tract endoscopy was performed, and the patient was diagnosed with advanced esophageal cancer(stage Ⅳ, cT4N4M0). We initiated palliative chemotherapy of FOLFOX as first-line chemotherapy. After the fourth course, the patient was evaluated as having progressive disease(PD)due to regrowth of lymph node metastasis around the lower esophagus. Although we changed the treatment to nivolumab as second-line chemotherapy, there was a gradual exacerbation of airway obstruction, and the head and upper limb edema emerged due to superior vena cava syndrome. After the first course of nivolumab, we diagnosed the patient as having clinically PD. After the first course of docetaxel(DTX)as third-line chemotherapy, he suddenly died of massive hemorrhage caused by the intubation tube on day 136. Airway management is difficult to perform in patients with a poor response to chemotherapy due to obstruction by a tumor. On the other hand, excessive response to chemotherapy is also associated with a risk of massive hemorrhage due to arterial perforation, as observed in this case.

A case of congenital bronchial atresia patient with subclinical infection who underwent lung resection.

Congenital bronchial atresia, CBA, is rare and has often asymptomatic benign condition. The CBA condition usually arose during the formation of bronchi, but the CBA patients are able to live well into adulthood. This case highlights a potential surgical intervention for a CBA patient with subclinical infection. A 55-year-old Japanese male had abnormal findings on his chest X-ray at an annual health check-up in March 2018. His chest computed tomography (CT) revealed bronchial stenosis and infiltrative shadow in the right inferior lobe. He was referred to our hospital for further investigation and was diagnosed CBA after a variety of examinations including bronchoscopy. His dilated bronchi were filled with mucus, the end of one of the bronchi had obstructive pneumonia, and subclinical infection in the CBA lesion was suspected. Also, the result of bronchoscopy disclosed intrabronchial infection with Gram-positive bacteria so we performed lobectomy onto the lower lobe. Although no protocol had been established, a surgical intervention would be necessary for this case.

[A Case of Ipsilateral Breast Tumor Recurrence(IBTR)after Breast-Conserving Surgery Which Successfully Resected after Chemotherapy Using Carboplatin plus Gemcitabine].

A 39-year-old woman underwent partial mastectomy with sentinel lymph node biopsy for right triple negative breast cancer(T2N0M0, Stage ⅡA). Six months later, ipsilateral breast tumor recurrence(IBTR)was observed and paclitaxel plus bevacizumab therapy was started, but anaphylactoid symptoms appeared and the patient was discontinued. Subsequently, eribulin was started, but the IBTR was increased ineffectively. At that point, IBTR had progressed, apparently unresectable, with no distant metastases. We predicted from the patient's background that the patient may be associated with BRCA1 gene mutation and was sensitive to the platinum salts. Carboplatin plus gemcitabine was selected and 6 courses were performed. After the 6 courses, the IBTR were remarkably reduced and resectable, and mastectomy with axillary lymph node dissection were performed. One year after the operation, contralateral breast cancer develop and found to be hereditary breast and ovarian cancer syndrome (HBOC) by Genetic test. About 6 years have passed since local recurrence, but no distant metastases have been observed.

Nivolumab-induced sialadenitis.

Nivolumab has been increasingly used for a range of malignancies, and a variety of immune-related adverse events (irAEs) have been reported with its use. Nivolumab-induced sialadenitis (inflammation of salivary glands) and xerostomia (dry mouth) have been reported to occur in 0.03% and 0.05% respectively, but there have been no case reports published about these side effects. Sialadenitis is not a life-threatening irAEs, but xerostomia can become irreversible if not recognized and treated as it can otherwise lower quality of life and result in susceptibility to infection. Therefore, healthcare providers need to know about sialadenitis as one of the irAEs of Nivolumab. Thus, we present the first case of nivolumab-induced sialadenitis. A 70-year old man with pulmonary adenocarcinoma developed sialadenitis 4 months after initiating nivolumab. His serum amylase levels were elevated to 1373 IU/L, and a biopsy of his labial minor salivary glands showed severe lymphocytic inflammation with damage to the glands. His sialadenitis was improved by taking corticosteroids and by ceasing nivolumab.

Azygos vein aneurysm resection concomitant with heart valve repair via right thoracotomy.

Azygos vein aneurysm is very rare and is usually found incidentally because of its clinical silence. We report a case of recurrent pleural effusion caused by an azygos vein aneurysm in a patient with moderate mitral valve regurgitation (MR) and tricuspid valve regurgitation (TR). Since valve disease is considered a significant precipitating factor for both dyspnoea and pleural effusion, we decided to study the aetiologies of these conditions concomitantly. Azygos vein aneurysm resection in combination with tricuspid and mitral valve repair using cardiopulmonary bypass was performed successfully through a right anterior thoracotomy. The postoperative course was uneventful, and the patient reported improved exercise capacity.

Chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids (CLIPPERS) after treatment for Hodgkin's lymphoma.

Chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids (CLIPPERS) is a rare central nervous system (CNS) disorder with distinct radiological features. However, CLIPPERS may mimic CNS lymphoma, and several cases in which CLIPPERS occurred premonitory to CNS lymphoma have been reported. We report a 31-year-old man presenting with progressive gait ataxia and the characteristic MRI features of CLIPPERS. He was diagnosed with stage II Hodgkin's lymphoma at the age of 15, and we considered the possibility of newly emerged CNS lymphoma occurring in the immunosuppressive condition after the treatment of Hodgkin's lymphoma. Histological findings showed no evidence of CNS lymphoma and the neurological symptoms were resolved by steroids. Although CLIPPERS developed in the reverse order in this case, CLIPPERS should be considered in different diagnosis for CNS lymphoma.

Periappendicitis during adalimumab treatment for ileocecal Crohn's disease in a 29-year-old male.

A 29-year-old male was diagnosed with ileocolic Crohn's disease (CD) approximately 2 years ago. Adalimumab was prescribed as CD remission induction therapy. Three months after beginning adalimumab, watery diarrhea and lower abdominal pain developed. He was admitted under a diagnosis of CD exacerbation. Despite fasting and antibiotic treatment, symptoms of acute panperitonitis appeared. He was diagnosed as acute appendicitis and we performed emergency surgery for peritoneal drainage and ileocecal resection on the fifth hospital day. We diagnosed periappendicitis based on the operative findings. This is the first report of periappendicitis with CD during adalimumab treatment.