Familial Cancer

, Volume 11, Issue 4, pp 579–585

Cancer risks and immunohistochemical profiles linked to the Danish MLH1 Lynch syndrome founder mutation

Authors

    • HNPCC Register, Clinical Research CentreCopenhagen University Hospital
  • Anna Isinger-Ekstrand
    • HNPCC Register, Clinical Research CentreCopenhagen University Hospital
  • Steen Ladelund
    • HNPCC Register, Clinical Research CentreCopenhagen University Hospital
  • Anja Nissen
    • HNPCC Register, Clinical Research CentreCopenhagen University Hospital
  • Eva Rambech
    • Department of Oncology, Institute of Clinical SciencesLund University
  • Inge Bernstein
    • HNPCC Register, Clinical Research CentreCopenhagen University Hospital
  • Mef Nilbert
    • HNPCC Register, Clinical Research CentreCopenhagen University Hospital
    • Department of Oncology, Institute of Clinical SciencesLund University
Original Article

DOI: 10.1007/s10689-012-9552-4

Cite this article as:
Therkildsen, C., Isinger-Ekstrand, A., Ladelund, S. et al. Familial Cancer (2012) 11: 579. doi:10.1007/s10689-012-9552-4

Abstract

Founder mutations with a large impact in distinct populations have been described in Lynch syndrome. In Denmark, the MLH1 c.1667+2_1667_+8TAAATCAdelinsATTT mutation accounts for 25 % of the MLH1 mutant families. We used the national Danish hereditary nonpolyposis colorectal cancer register to estimate the cumulative lifetime risks for Lynch syndrome-associated cancer in 16 founder mutation families with comparison to 47 other MLH1 mutant families. The founder mutation conferred comparable risks for colorectal cancer (relative risks, RR, of 0.99 for males and 0.79 for females) and lower risks for extracolonic cancer (RR of 0.69 for endometrial cancer and 0.39 for all other extracolonic cancers). We also characterized expression of key Wnt-signaling proteins in colorectal cancers with the founder mutation. Aberrant staining affected β-catenin in 59 %, E-cadherin in 68 %, TCF-4 in 94 % and Cyclin D1 in 68 % with extensive inter-tumor variability despite the same underlying germline mutation. In conclusion, the Danish MLH1 founder mutation that accounts for a significant proportion of Lynch syndrome and is associated with a lower risk for extracolonic cancers.

Keywords

HNPCCMismatch repairColorectal cancerEndometrial cancerCumulative riskWnt-signaling

Supplementary material

10689_2012_9552_MOESM1_ESM.xls (19 kb)
Supplementary material 1 (XLS 19 kb)

Copyright information

© Springer Science+Business Media B.V. 2012