Sarcomatoid renal cell carcinoma is a highly aggressive tumor. It is not a distinct histologic entity as it can be found in any subtypes of renal cell carcinoma. Recent molecular and genetic evidence suggest that sarcomatoid component is transformed from a common progenitor of the associated renal cell carcinoma, and the TP53 gene plays a pivotal role in this process. The presence of sarcomatoi...

Monoclonal antibodies that target the programmed death-1 (PD-1)-programmed death ligand-1 (PD-L1) axis have antitumor activity against multiple cancers. The presence of sarcomatoid differentiation in renal cell carcinoma (RCC) is associated with resistance to targeted therapy and poor responses to IL2 immunotherapy. Given the aggressive nature of RCC with sarcomatoid differentiation and the exc...

ing a mixture of carcinomatous and sarcomatous elements (1). Liver carcinosarcomas are classified as two types including sarcomatoid hepatocellular carcinoma (HCC) and cholangiocarcinoma. A sarcomatoid HCC is a carcinoma that most resembles a sarcoma found in the liver. Only a few cases of intrahepatic sarcomatoid cholangiocarcinomas have been reported (1-6). To the best of our knowledge, an in...

BACKGROUND Sarcomatoid carcinoma is a rare, aggressive, malignant cancer composed of sarcoma and sarcoma-like components, and can occur in different organs such as the thyroid gland, bone, skin, breast, pancreas, liver, urinary tract, and lung. Pulmonary sarcomatoid carcinoma accounts for only a small percentage of lung cancers and has histological variants that include pleomorphic carcinoma, g...

Sarcomatoid component can occur in all histological subtypes of renal cell carcinoma but most commonly accompanies chromophobe renal cell carcinoma. The majority of the sarcomatoid components consist of malignant fibrous histiocytoma, fibrosarcoma or undifferentiated sarcoma areas. Heterologous differentiation in the form of osteosarcoma or rhabdomyosarcoma is very rarely encountered. We report...

Tracheal sarcomatoid carcinoma is an extremely infrequent neoplasm with unclear pathogenesis and clinical outcomes. To date, only two cases have been described in English literature. We report a case of a 37-year-old patient complaining of hemoptysis, dyspnea, and cough. An intraluminal polypoid mass in the trachea was found and ultimately diagnosed as tracheal sarcomatoid carcinoma in the cerv...

Carcinomas with osteoclast-like giant cells (OGCs) are a rare type of malignant tumor that is histologically characterized by the presence of multinucleated giant cells that resemble osteoclasts mixed with poorly differentiated adenocarcinoma cells. In this study, we report the clinicopathological and immunohistochemical features of a gastric sarcomatoid carcinoma with OGCs in a 37-year-old mal...

The presence of sarcomatoid features in clear cell renal cell carcinoma (ccRCC) confers a poor prognosis and is of unknown pathogenesis. We performed exome sequencing of matched normal-carcinomatous-sarcomatoid specimens from 21 subjects. Two tumors had hypermutation consistent with mismatch repair deficiency. In the remainder, sarcomatoid and carcinomatous elements shared 42% of somatic single...

A sarcomatoid component can occur in all histologic subtypes of renal cell carcinoma (RCC) and indicates an aggressive tumor. It is reported in literature that the sarcomatoid component can resemble fibrosarcoma, malignant fibrous histiocytoma or rhabdomyosarcoma. We describe the case of a 59-years old patient diagnosed with a chromophobe renal cell carcinoma, presenting a very rare osteosarcom...

Colonic sarcomatoid carcinomas are known to be extremely rare tumors, with only 22 cases reported either as sarcomatoid carcinomas or carcinosarcomas in the literature. The known characteristics are rapid growth, a high recurrence rate, and an extremely poor prognosis. Herein we report a case of a patient who had a sarcomatoid carcinoma of the sigmoid colon and died only 22 days after surgery d...