Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0677930 (primary tumor)
 20,210 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A transplantable tumor line (IP) was established in syngeneic rats from a spontaneous pulmonary carcinoma found in a male F344 rat aged 25 months. A tissue fragment of IP grew into a nodule, 2-3 cm in diameter, 2-3 weeks after implant, and IP has been serially passed through 26 generations. Lined by cuboidal or columnar epithelial cells, the primary tumor consisted of completely alveolar architecture. However, IP tumors developed various growth patterns such as glandular, acinar, trabecular, cord, and solid, and consisting of epithelial cells showing cellular atypia. Ultrastructurally, neoplastic cells had microvilli, basement membranes, and desmosomes, and occasional cells possessed dense cytoplasmic granules. Interestingly, it was shown by the immunohistochemistry, the RT-PCR method, and immunoradiometric assay that IP tumor cells produce parathyroid hormone-related protein (PTHrP). During a 3-week observation period after implant, IP-bearing rats showed severe emaciation, hypercalcemia, and hypophosphatemia, as well as an increase in osteoclastic areas and a decrease in shaft thickness of the femurs. These were considered to be due to a marked elevation of plasma PTHrP levels. Furthermore, IP-bearing rats developed calcification in various organs including the kidneys, lungs, and heart. These findings in IP-bearing rats were similar to those of humoral hypercalcemia of malignancy (HHM) reported in human cancer patients. PTHrP plays a central role in the development of HHM, but the mechanisms of HHM remain poorly understood. IP may become a useful model for studying the pathogenesis of HHM and the pathophysiological role of PTHrP.
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PMID:Establishment of a transplantable tumor line (IP) derived from rat pulmonary carcinoma, developing humoral hypercalcemia of malignancy in IP-bearing rats. 1196 51

This report concerns a case of pancreatic carcinoma with widespread metastases to many organs including intracranial metastasis. An eleven-year-old, male, mixed-breed dog showed emaciation, ataxia, and multiple visible tumors within the neck. A MRI examination of the patient was conducted because of ataxia, and it was found that the intracranial invasive growth had resulted in compression of the brain stem. Necropsy was performed after the patient died. Based on gross and microscopic examination, the primary tumor cells were located in the left lobe of the pancreas and widespread metastasis was found into various organs, including the brain, lungs, liver, kidneys, tonsils, serosal surface of the esophagus, and submandibular, pulmonary hilar, mediastinal, and mesenteric lymph nodes. This case indicates that pancreatic adenocarcinoma should be included in the differential diagnosis list when cervical neck masses are detected.
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PMID:Pancreatic acinar cell carcinoma with intracranial metastasis in a dog. 1728 9