We also thank Mr. IgA, IgM, C3, C4, and C1q. Immunosuppressive therapy was administered, but was ineffective. Further examination by electron microscopy and immunostaining led to a diagnosis of bevacizumab-associated glomerular microangiopathy. Keywords:Bevacizumab-associated glomerular microangiopathy, Nephrotic syndrome, Ovarian malignancy == Introduction == Bevacizumab is usually a monoclonal antibody against vascular endothelial growth factor (VEGF) that is used to treat various cancers. Adverse events caused by this agent include hypertension and proteinuria; notably, severe proteinuria (grade 3 or 3.5 g/day) Midodrine D6 hydrochloride is observed in approximately 3% of patients [1,2]. The histological types Midodrine D6 hydrochloride of this type of nephropathy include thrombotic microangiopathy (TMA) [3,4] and minimal switch nephrotic syndrome [5]. However, bevacizumab-associated glomerular microangiopathy or anti-VEGF therapy-induced glomerular microangiopathy Rabbit Polyclonal to UBAP2L have been proposed as renal lesions that differ from TMA and were previously considered forms of glomerular TMA [6,7]. Here, we statement our experience with a patient whose presentation appeared to match this concept. == Case statement == A 68-year-old woman with a history of advanced ovarian malignancy was admitted to our hospital for nephrotic syndrome. In June 2016, hysterectomy and bilateral salpingo-oophorectomy with dissection of the omental, umbilical, and right inguinal lymph nodes were performed for ovarian malignancy. The postoperative diagnosis was high-grade serous adenocarcinoma, pT3N1M1, stage IVB. Preoperative urinary examinations showed no abnormal findings. Postoperative chemotherapy with carboplatin, paclitaxel, and bevacizumab was initiated in July 2016. After three courses, proteinuria and elevated blood pressure were observed. The proteinuria was still present after six courses at a level of 2 + , but the hypertension trended toward improvement. The patient was placed Midodrine D6 hydrochloride under observation. In June 2017, ovarian malignancy recurrence was detected as peritoneal dissemination and left lymph node metastasis, and administration of gemcitabine and carboplatin was initiated. The proteinuria was sustained at a level of 1 1 + to 2 + during the second chemotherapy. In March 2018, after the eighth course, the patient noticed edema of the lower legs, and was admitted to our hospital. On admission, physical examination revealed a slightly elevated blood pressure of 144/89 mmHg. Her palpebral conjunctiva was pale. Surgical scars were observed on her abdomen, lower abdominal midline, and right lower stomach. Her limbs exhibited moderate pitting edema. No abnormal signs were observed in her lungs, heart, or skin. Laboratory findings on admission are outlined in Table1. Nephrotic syndrome was significant with urinary protein 6.75 g/gCr and serum albumin 2.7 g/dL, accompanied by urinary erythrocytes (3040/high-powered field), and granular casts. Antinuclear antibodies were positive, while antidouble stranded-DNA antibodies were negative. Cryoglobulin was also negative. == Table 1. == Laboratory findings RBCred blood cells,WBCwhite blood cells,HPFhigh power field,Crcreatinine,TPtotal protein,T-biltotal bilirubin,ASTaspartate aminotransferase,ALTalanine aminotransferase,LDHlactate dehydrogenase,CPKcreatine phosphokinase,BUNblood urea nitrogen,CRPC-reactive protein,ANAantinuclear antibody,ANCAantineutrophil cytoplasmic antibody,PTprothrombin time,APTTactivated partial thromboplastin time Percutaneous renal biopsy was performed. A total of 29 glomeruli were observed in a specimen by light microscopy; of these, 4 showed global sclerosis. The other glomeruli exhibited periodic acid-Schiff (PAS)-positive lesions in the capillary walls and para-mesangial area, and the affected capillary lumen was almost occluded. Podocyte detachment was found in some glomerular capillaries (Fig.1a). Periodic acid-methenamine silver staining showed considerable double contouring of the glomerular basement membrane and spike formation in restricted area (Fig.1b). Some dilation of proximal tubules, absence of the brush border, and moderate interstitial infiltration of lymphocytes were observed (Fig.1c). Immunohistochemical staining revealed that this PAS-positive lesions were CD61-unfavorable (anti CD61 antibody; Clone Y2/51, Dako, dilution 1:100), which indicated that this lesion contained no platelets (Fig.1d). VEGF (anti VEGF antibody; SC7269, Santa Cruz, dilution 1:250) expression was Midodrine D6 hydrochloride decreased in glomeruli (Fig.1e). Staining for phospholipase A2 receptor (Anti-PLA2R1; HPA012657, Atlas Antibodies, Poly IgG, 2000) and thrombospondin type-1 domain-containing 7A (Anti-THSD7A; HPA000923, SIGMA, Atlas Antibodies, Poly IgG, 800) were negative. The samples tested positive for IgG, IgA, IgM, C3, C4, and C1q on immunofluorescence microscopy (Fig.2). Electron microscopy revealed the presence of electron dense materials in the subendothelial and para-mesangial area. Disappearance of.