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The two most common are humoral hypercalcemia of malignancy and local osteolytic hypercalcemia due to bony metastasis. Humoral hypercalcemia of malignancy involves the tumor releasing a hormone which increases calcium mobilization (most commonly parathyroid hormone-related protein (PTHrP)) into the circulation. [22]
PTHrP is related in function to parathyroid hormone(PTH). When a tumor secretes PTHrP, this can lead to hypercalcemia. [11] As this is sometimes the first sign of the malignancy, hypercalcemia caused by PTHrP is considered a paraneoplastic phenomenon. PTHrP is responsible for most cases of humoral hypercalcemia of malignancy.
Differential diagnoses of hypercalcemia include humoral hypercalcemia of malignancy, renal failure, malignant bone destruction (such as multiple myeloma, metastatic breast cancer, lymphoma), thiazide diuretics, lithium, immobilization, hyperthyroidism, milk alkali syndrome, multiple endocrine adenomatosis syndromes, and granulomatous diseases. [37]
Hypercalcemia occurs most commonly in breast cancer, lymphoma, prostate cancer, thyroid cancer, lung cancer, myeloma, and colon cancer. [2] It may be caused by secretion of parathyroid hormone-related peptide by the tumor (which has the same action as parathyroid hormone), or may be a result of direct invasion of the bone, causing calcium ...
Hypercalcemia, elevated blood calcium, has numerous causes, including [5] Elevated levels of parathyroid hormone due to hyperparathyroidism, leading to bone resorption and subsequent hypercalcemia by reducing phosphate concentration. Secretion of parathyroid hormone-related protein by certain tumors. Resorption of bone due to
These growths can be noncancerous (benign) or cancerous (malignant). If the tumors become cancerous, some cases can be life-threatening. Comparison of main types of multiple endocrine neoplasia. The two major forms of multiple endocrine neoplasia are called type 1 and type 2. These two types are often confused because of their similar names.
When associated with the lung, it is typically a centrally located large-cell cancer (non-small-cell lung cancer). It often has a paraneoplastic syndrome causing ectopic production of parathyroid hormone-related protein, resulting in hypercalcemia, but paraneoplastic syndrome is more commonly associated with small-cell lung cancer. It is ...
Dystrophic calcification can occur even if the amount of calcium in the blood is not elevated, in contrast to metastatic calcification, which is a consequence of a systemic mineral imbalance, including hypercalcemia and/or hyperphosphatemia, that leads to calcium deposition in healthy tissues. [2]