title: Monoclonality of asynchronous bilateral lymphoma of the testis.
abstract: OBJECTIVE
  Lymphoma is the most frequent testicular malignancy in men over 60 years of age. Even though patients present initially with localized disease, the high incidence of bilateral involvement, synchronous or not, and early systemic dissemination are characteristic of these neoplasms. Sometimes the interval between tumor involvement of both testes is long. The question is raised whether either the patient has a predisposition to present new clones of transformed lymphocytes, or the same disease using the same pathway from a systemic reservoir infiltrates the contralateral testis.
  
  
  METHODS
  Polymerase chain reaction and DNA sequencing were used to detect immunoglobulin heavy chain (IgH) rearrangement in paraffin-embedded specimens from asynchronous tumors affecting the right and left testis of a 85-year-old man with an interval period of 13 months.
  
  
  RESULTS
  Both tumors showed the same IgH rearrangement.
  
  
  CONCLUSIONS
  The lymphoma affecting the left and right testis derived from the same clone. It makes a strong case that lymphoma of the testis is the first manifestation of a systemic disease and should be treated aggressively early at the beginning of the disease.
authors: Laboratory of Molecular and Surgical Pathology, Sirio Libanes Hospital, São Paulo, Brazil. katiaramos@uol.com.br
authors: K R
authors: KR
authors: Leite
authors: B
authors: B
authors: Garicochea
authors: M
authors: M
authors: Srougi
authors: C
authors: C
authors: Dzik
authors: L
authors: L
authors: Nesralhah
authors: R C
authors: RC
authors: de Moura
authors: A J
authors: AJ
authors: Simpson
authors: E
authors: E
authors: Darini
authors: C M
authors: CM
authors: Carvalho
authors: L H
authors: LH
authors: Camara-Lopes
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D004273:DNA, Neoplasm / Q000737:chemistry; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000737:chemistry; D016403:Lymphoma, Large B-Cell, Diffuse / Q000235:genetics* / Q000473:pathology; D008297:Male; D016133:Polymerase Chain Reaction; D013736:Testicular Neoplasms / Q000235:genetics* / Q000473:pathology; D013737:Testis / Q000473:pathology; D013997:Time Factors
chemical_list: D004273:DNA, Neoplasm; D007143:Immunoglobulin Heavy Chains