Gardner's syndrome

Gardner’s syndrome is a genetic disorder characterized by the presence of multiple polyps in the colon together with tumors outside the colon. The extracolonic tumors may include osteomas of the skull, thyroid cancer, epidermoid cysts, fibromas and sebaceous cysts. The countless polyps in the colon predispose to the development of colon cancer.

Inheritance

Gardner’s syndrome is inherited in an autosomal dominant manner. Typically, one parent has Gardner’s syndrome. Each of their children, male and female alike, are at 50% risk of inheriting the gene for Gardner’s syndrome and manifesting it.

Diagnosis

Gardner’s syndrome can be identified based on oral findings, including multiple impacted and supernumerary teeth, multiple jaw osteomas which give a “cotton-wool” appearance to the jaws, as well as multiple odontomas, congenital hypertrophy of the retinal pigment epithelium (CHRPE), in addition to multiple adenomatous polyps of the colon.

Eponym

The syndrome is named for Eldon J. Gardner (1909-1989), a college teacher of genetics, who first described it in 1951.^[1] Gardner had been introduced to a large Utah family with the syndrome by a premedical student in his course in genetics.

Genetics

Gardner’s syndrome is now known to be caused by mutation in the APC gene located in chromosome 5q21 (band q21 on chromosome 5). This is the same gene as is mutant in familial adenomatous polyposis (FAP), a more common disease that also predisposes to colon cancer.

New genetic and molecular information has caused some genetic disorders to be split into multiple entities while other genetic disorders merge into one condition. After existing for most of the second half of the 20th century, Gardner’s syndrome has vanished as a separate entity. It has been merged into familial adenomatous polyposis (FAP) and is now considered simply a phenotypic variant of FAP.

DIfferentiating Gardner’s syndrome from other diseases


Disease	Gene	Chromosome	Differentiating Features	Components of MEN			Diagnosis
Disease	Gene	Chromosome	Differentiating Features	Parathyroid	Pitutary	Pancreas	Diagnosis
von Hippel-Lindau syndrome	Von Hippel–Lindau tumor suppressor	3p25.3	Angiomatosis, Hemangioblastomas, Pheochromocytoma, Renal cell carcinoma, Pancreatic cysts (pancreatic serous cystadenoma) Endolymphatic sac tumor, Bilateral papillary cystadenomas of the epididymis (men) or broad ligament of the uterus (women)	–	–	+	Clinical diagnosis In hereditary VHL, disease techniques such as Southern blotting and gene sequencing can be used to analyse DNA and identify mutations.
Carney complex	PRKAR1A	17q23-q24	Myxomas of the heart Hyperpigmentation of the skin (lentiginosis) Endocrine (ACTH-independent Cushing’s syndrome due to primary pigmented nodular adrenocortical disease)	–	–	–	Clinical diagnosis
Neurofibromatosis type 1	RAS	17	Scoliosis Learning disabilities Vision disorders Cutaneous lesions Epilepsy.	–	–	–	Prenatal Chorionic villus sampling or amniocentesis can be used to detect NF-1 in the fetus. Postnatal Cardinal Clinical Features” are required for positive diagnosis. Six or more café-au-lait spots over 5 mm in greatest diameter in pre-pubertal individuals and over 15 mm in greatest diameter in post-pubertal individuals. Two or more neurofibromas of any type or 1 plexiform neurofibroma Freckling in the axillary (Crowe sign) or inguinal regions Optic glioma Two or more Lisch nodules (pigmented iris hamartomas) A distinctive osseous lesion such as sphenoid dysplasia, or thinning of the long bone cortex with or without pseudarthrosis.
Li-Fraumeni syndrome	TP53	17	Early onset of diverse amount of cancers such as Sarcoma Cancers of Breast Brain Adrenal glands	–	–	–	Criteria Sarcoma at a young age (below 45) A first-degree relative diagnosed with any cancer at a young age (below 45) A first or second degree relative with any cancer diagnosed before age 60.
Gardner’s syndrome	APC	5q21	Multiple polyps in the colon Osteomas of the skull Thyroid cancer, Epidermoid cysts, Fibromas Desmoid tumors	–	–	–	Clinical diagnosis Colonoscopy
Multiple endocrine neoplasia type 2	RET	–	Medullary thyroid carcinoma (MTC) Pheochromocytoma Primary hyperparathyroidism	+	–	–	Hypercalcemia Hypophosphatemia, Elevated parathyroid hormone, Elevated norepinephrine Criteria Two or more specific endocrine tumors Medullary thyroid carcinoma Pheochromocytoma Parathyroid hyperplasia
Cowden syndrome	PTEN	–	Hamartomas	–	–	–	PTEN mutation probability risk calculator
Acromegaly/gigantism	–	–	Enlargement of the hands, feet, nose, lips and ears, and a general thickening of the skin Hypertrichosis Hyperpigmentation Hyperhidrosis Carpal tunnel syndrome.	–	+	–	An elevated concentration of serum growth hormone (GH) and insulin-like growth factor 1(IGF-1) levels is diagnostic of acromegaly.
Pituitary adenoma	–	–	Visual field defects classically bitemporal hemianopsia Increased intracranial pressure Migraine Lateral rectus palsy	–	+	–	Elevated serum level of prolactin Elevated or decreased serum level of adrenocorticotropic hormone (ACTH) Elevated or decreased serum level of growth hormone (GH) Elevated or decreased serum level of thyroid-stimulating hormone (TSH) Elevated or decreased serum level of follicle-stimulating hormone (FSH) Elevated or decreased serum level of luteinizing hormone (LH)
Hyperparathyroidism	–	–	– Kidney stones Hypercalcemia, Constipation Peptic ulcers Depression	+	–	–	An elevated concentration of serum calcium with elevated parathyroid hormone level is diagnostic of primary hyperparathyroidism. Most consistent laboratory findings associated with the diagnosis of secondary hyperparathyroidism include elevated serum parathyroid hormone level and low to normal serum calcium. An elevated concentration of serum calcium with elevated parathyroid hormone level in post renal transplant patients is diagnostic of tertiary hyperparathyoidism.
Pheochromocytoma/paraganglioma	VHL RET NF1 SDHB SDHD	–	Characterized by Episodic hypertension Palpitations Anxiety Diaphoresis Weight loss	–	–	–	Increased catecholamines and metanephrines in plasma (blood) or through a 24-hour urine collection.
Adrenocortical carcinoma	p53 Retinoblastoma h19 Insulin-like growth factor II (IGF-II) p57^kip2	17p, 13q	Cushing syndrome (cortisol hypersecretion) Conn syndrome (aldosterone hypersecretion) virilization (testosterone hypersecretion)	–	–	–	Increased serum glucose Increased urine cortisol Serum androstenedione and dehydroepiandrosterone Low serum potassium Low plasma renin activity High serum aldosterone. Excess serum estrogen.
Adapted from Toledo SP, Lourenço DM, Toledo RA. A differential diagnosis of inherited endocrine tumors and their tumor counterparts, journal=Clinics (Sao Paulo), volume= 68, issue= 7, 07/24/2013^[2]

References

↑ Gardner EJ (1951). “A genetic and clinical study of intestinal polyposis, a predisposing factor for carcinoma of the colon and rectum”. Am J Hum Genet. 3: 167–76. PMC 1716321. PMID 14902760.
↑ Toledo SP, Lourenço DM, Toledo RA (2013). “A differential diagnosis of inherited endocrine tumors and their tumor counterparts”. Clinics (Sao Paulo). 68 (7): 1039–56. doi:10.6061/clinics/2013(07)24. PMC 3715026. PMID 23917672.

External Links

Template:RareDiseases

Template:Digestive system neoplasia

de:Gardner-Syndrom it:Sindrome di Gardner

Template:WH Template:WS

[1] Gardner EJ (1951). “A genetic and clinical study of intestinal polyposis, a predisposing factor for carcinoma of the colon and rectum”. Am J Hum Genet. 3: 167–76. PMC 1716321. PMID 14902760.

[pmid23917672-2] Toledo SP, Lourenço DM, Toledo RA (2013). “A differential diagnosis of inherited endocrine tumors and their tumor counterparts”. Clinics (Sao Paulo). 68 (7): 1039–56. doi:10.6061/clinics/2013(07)24. PMC 3715026. PMID 23917672.

[1]

[2]