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Stage IVB includes: T1-4, N0-3, M1, B0-2. T1: Limited patches, papules, and/or plaques covering less than 10% of the skin surface. May further stratify into T1a (patch only) vs. T1b (plaque +/- patch). T2: Patches, papules, or plaques covering 10% or more of the skin surface. May further stratify into T2a (patch only) vs. T2b (plaque +/- patch). T3: One or more tumors (equal or greater than 1 cm diameter). T4: Confluence of erythema covering 80% or more of body surface area. N0: No clinically abnormal peripheral lymph nodes; biopsy not required. N1: Clinically abnormal peripheral lymph nodes; histopathology Dutch grade 1 or NCI LN0-2. N2: Clinically abnormal peripheral lymph nodes; histopathology Dutch grade 2 or NCI LN3. N3: Clinically abnormal peripheral lymph nodes; histopathology Dutch grades 3-4 or NCI LN4; clone positive or negative. M1: Visceral involvement (must have pathology confirmation and organ involved should be specified). B0: Absence of significant blood involvement: 5% or less of peripheral blood lymphocytes are atypical (Sezary cells). B1: Low blood tumor burden: more than 5% of peripheral blood lymphocytes are atypical (Sezary) cells but does not meet the criteria of B2. B2: High blood tumor burden: 1000/microL Sezary cells or more with positive clone. (AJCC 7th ed.) Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C88162\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C88162\' NCI Thesaurus)
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