The natural history of the majority of CUP cases is invariably characterised by an aggressive clinical course with median survival times rarely exceeding 6 months from diagnosis (Pavlidis et al, 2012).
Tregs are essential modulators of the adaptive immune response, making up 5 10% of CD4+ T cells in the mouse and often (but not invariably) characterised by the expression of the transcription factor FoxP3. Absence of CD4+ FoxP3+ Treg cells in both mice and humans leads to autoimmunity, and defective or suboptimal Treg function during RSV infection may cause immunopathology.
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However, in these large animal studies the experimental endpoint has invariably been to characterise a given phenotypic consequence, and have been conducted when the animals have been raised in an environment appropriate for that species (e.g. for sheep, on pasture for 1 3 years; [14], [15]).
I have Burning Mouth Syndrome, which is characterised by occurring almost invariably in a healthy mouth.
Plasmablastic lymphoma (PBL) has been classified by the WHO as a new clinical entity, and characterised as an aggressive, invariably fatal, subtype of non-Hodgkin's lymphoma, typically occurring in HIV-infected patients [27, 28].
Progressive familial intrahepatic cholestasis (PFIC) is another liver disease, characterised by severe cholestasis, starting almost invariably before 6 months of age.
Patients with advanced cancer suffer from cachexia, which is characterised by a marked weight loss, and is invariably associated with the presence of tumoral and humoral factors which are mainly responsible for the depletion of fat stores and muscular tissue.
Clinically, it is characterised by dyspnoea and pulmonary arterial hypertension, which almost invariably progresses to right heart strain and cardiorespiratory arrest in hours to days.
Hereditary multiple exostosis (HME) is characterised by multiple osteochondromas that are distributed throughout the skeleton, invariably involving the shoulder girdle.
These T-PLLs in ATs have been well characterised in the past by several groups including us, and are quite invariably preceded by a T cell clonal expansion identifiable cytogenetically to carry a t(14 14 q11 q32.1) translocation or an inv(14 q11 q32.1) inversion or a t(X 14 q28 q32.1) translocation.
