TPM3-ALK and TPM4-ALK oncogenes in inflammatory myofibroblastic tumors

Am J Pathol. 2000 Aug;157(2):377-84. doi: 10.1016/S0002-9440(10)64550-6.


Inflammatory myofibroblastic tumors (IMTs) are neoplastic mesenchymal proliferations featuring an inflammatory infiltrate composed primarily of lymphocytes and plasma cells. The myofibroblastic cells in some IMTs contain chromosomal rearrangements involving the ALK receptor tyrosine-kinase locus region (chromosome band 2p23). ALK-which is normally restricted in its expression to neural tissues-is expressed strikingly in the IMT cells with 2p23 rearrangements. We now report a recurrent oncogenic mechanism, in IMTs, in which tropomyosin (TPM) N-terminal coiled-coil domains are fused to the ALK C-terminal kinase domain. We have cloned two ALK fusion genes, TPM4-ALK and TPM3-ALK, which encode approximately 95-kd fusion oncoproteins characterized by constitutive kinase activity and tyrosylphosphorylation. Immunohistochemical and molecular correlations, in other IMTs, implicate non-TPM ALK oncoproteins that are predominantly cytoplasmic or pre- dominantly nuclear, presumably depending on the subcellular localization of the ALK fusion partner. Notably, a TPM3-ALK oncogene was reported recently in anaplastic lymphoma, and TPM3-ALK is thereby the first known fusion oncogene that transforms, in vivo, both mesenchymal and lymphoid human cell lineages.

MeSH terms

  • Adult
  • Anaplastic Lymphoma Kinase
  • Base Sequence
  • Child
  • Child, Preschool
  • DNA, Complementary / chemistry
  • DNA, Complementary / genetics
  • Female
  • Gene Expression Regulation, Neoplastic
  • Granuloma, Plasma Cell / genetics*
  • Granuloma, Plasma Cell / pathology
  • Humans
  • In Situ Hybridization, Fluorescence
  • Infant
  • Male
  • Middle Aged
  • Molecular Sequence Data
  • Oncogene Proteins, Fusion / genetics
  • Protein-Tyrosine Kinases / genetics*
  • RNA, Neoplasm / genetics
  • Receptor Protein-Tyrosine Kinases
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sequence Analysis, DNA
  • Sequence Homology, Nucleic Acid
  • Tropomyosin / genetics*


  • DNA, Complementary
  • Oncogene Proteins, Fusion
  • RNA, Neoplasm
  • Tropomyosin
  • ALK protein, human
  • Anaplastic Lymphoma Kinase
  • Protein-Tyrosine Kinases
  • Receptor Protein-Tyrosine Kinases

Associated data

  • GENBANK/AF186109
  • GENBANK/AF186110