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Paraneoplastic syndromes in bronchogenic carcinoma By Group 1 A students Fifth year Alexandria faculty of medecine 2008-2009

Para Neoplastic Syndromes in bronchogenic carcinoma

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self learning activity made by five 5th year medical studentsAlexandria universityEGYPT

Text of Para Neoplastic Syndromes in bronchogenic carcinoma

Paraneoplasti c syndromes in bronchogenic carcinomaByGroup 1 A students

Fifth yearAlexandria faculty of medecine 2008-2009

Definition Paraneoplastic syndromes Clinical effects produced by a tumour that cannot be explained by the local or distant spread of the tumor or by hormones native to the tissue of origin of the tumor They are triggered by the immune system's response to cancer cells, or by remote effects of tumor-derived factors.

Importance Paraneoplastic syndromes are common in patients with lung cancer and may be the presenting finding or first sign of recurrence. They may mimic metastatic disease and, unless detected, lead to inappropriate palliative rather than curative treatment. They may represent significant clinical problems and may even be lethal.

Local EffectsA single tumor mass may: *destroy a vital structure ; *obstruct or perforate a hollow organ (esophagus); *ulcerate a natural surface (mucosa); *undergo necrosis and predispose to infection; *cause bleeding (melena, hematuria), hemorrhage, thrombosis, infarction; *invade adjacent structures (e.g. the superior vena caval syndrome)

Superior Vena Cava Syndrome

:Systemic effects Anemia may be caused by: *blood loss , or under production, *malnutrition, chronic infection, etc Decreased resistance to infections * Weak immune responsiveness: * cytotoxic drugs, radiation therapy, * tumor products , tumor- cell invasion of bone marrow and lymphoid spaces. Weight loss and cachexia Fever :caused by pyrogenic cytokines produced by tumours (IL-1, TNF alpha. etc)

Classification Paraneoplastic syndromes can be divided into 4 main categories: Endocrine, neurological, mucocutaneous and hematological paraneoplastic syndromes, as well as others that may not fit into any of the above categories.

Endocrinal syndromes Some tumors not originating in endocrine glands may produce ectopic hormones inappropriate for the tissue of origin causing multiple endocrinal syndromes such as: Cushing syndrome SIADH Hypercalcemia Carcinoid syndrome

Ectopic ACTH SyndromeAdrenocorticotrophin secretion (ACTH) stimulates cortisol mostly associated with cancer of the Lung (Small Cell Lung Cancer), Pancreas and Thymus. Excess ACTH Excess CORTISOL ==> Cushings (1) overproduction of cortisol (2) muscle wasting (3) hypokalaemia with metabolic alkalosis (4) Moon face and abdominal striae


Neurologic syndromes Lung cancer is one of the most common cancers associated with paraneoplastic neurological disorders. 1% of cancer patients develop a neurologic PNS Most are due to autoimmune phenomena Ag expressed by tumour cells cause immune response and Ab cross-reacts with normal neuronal antigens

:Neurologic syndromes These paraneoplastic disorders affect the central or peripheral nervous system and they are degenerative. Symptoms of paraneoplastic neurological disorders may include ataxia , dizziness, nystagmus , difficulty swallowing, loss of muscle tone, loss of fine motor coordination, slurred speech, memory loss, vision problems, sleep disturbances, dementia, seizures, sensory loss in the limbs.

Neurological syndromes: Lambert-Eaton myasthenic syndrome Paraneoplastic cerebellar degeneration Encephalomyelitis Limbic encephalitis Brainstem encephalitis Opsoclonus (involving eye movement) Encephalitis Polymyositis

Lambert-Eaton myasthenic (syndrome (LEMS Lambert-Eaton myasthenic syndrome is a condition in which weakness results from an abnormality of acetylcholine release at the neuromuscular junction. It results from an autoimmune attack against voltage-gated calcium channels on the presynaptic motor nerve terminal Cancer is present when the weakness begins or is later found in 40% of patients with LEMS. This is usually a small cell lung cancer (SCLC), although LEMS has also been associated with non-SCLC and other malignancies

Lambert-Eaton myasthenic syndrome The typical patient with LEMS presents with slowly progressive proximal leg weakness. Weak muscles may ache and are occasionally tender. Oropharyngeal and ocular muscles may be mildly affected. Respiratory muscles are not usually affected, but cases with severe respiratory compromise have been reported.

Lambert-Eaton myasthenic syndrome

Mucocutaneous: Acanthosis nigricans Dermatomyositis Leser-Trlat sign Necrolytic migratory erythema Sweet's syndrome Florid cutaneous papillomatosis Pyoderma gangrenosum

Hematological Granulocytosis Polycythemia Trousseau sign Nonbacterial thrombotic endocarditis Anemia

Others Membranous glomerulonephritis Tumor induced osteomalacia Hypertrophic osteoarthropathy

Isolated clubbing also occurs in chronic obstructive lung disease and congenital cyanotic heart disease

Other syndromesOthersyndromes Hormone Tumourtype Dermatomyositis None Carcinomaoflung,ovary,breast Hypertrophicosteoarthropathy None Bronchogeniccarcinoma (Fingerclubbing) Myastheniagravis NoneThymoma Autoimmunehaemolyticanemia NoneChroniclymphocyticleukemia Renaldysfunction NoneMultiplemyeloma,coloncancer Disseminatedintravascular coagulation(DIC) NoneSeveralAdvancedcancers