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Correspondence
Thymosin β4 was upregulated in recurred colorectal cancers
  1. Yun-Jeong Kang1,
  2. Jin-Ok Jo1,
  3. Mee Sun Ock1,
  4. Hee-Kyung Chang2,
  5. Seung-Hyun Lee3,4,
  6. Byung-Kwon Ahn3,
  7. Kyung-Wan Baek5,
  8. Yung Hyun Choi6,
  9. Wun-Jae Kim7,
  10. Sun-Hee Leem8,
  11. Hee-Jae Cha1,4
  1. 1Departments of Parasitology and Genetics, Kosin University College of Medicine, Busan, Republic of Korea
  2. 2Department of Pathology, Kosin University College of Medicine, Busan, Republic of Korea
  3. 3Department of Surgery, Kosin University College of Medicine, Busan, Republic of Korea
  4. 4Institute for Medical Scienc, Kosin University College of Medicine, Busan, Republic of Korea
  5. 5Department of Sports Science, Pusan National University, Busan, Republic of Korea
  6. 6Department of Biochemistry, College of Oriental Medicine, Dongeui University, Busan, Republic of Korea
  7. 7Department of Urology, Chungbuk National University College of Medicine, Cheongju, Republic of Korea
  8. 8Department of Biological Science, Dong-A University, Busan, Republic of Korea
  1. Correspondence to Professor Hee-Jae Cha, Departments of Parasitology and Genetics, Kosin University College of Medicine, Busan 602-702, Republic of Korea; hcha{at}kosin.ac.kr

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Recurrent cancers usually metastasise to other organs and have a very poor prognosis. Recurrence and metastatic spread have been proposed to depend on cancer stem cells, which express CD133.1

The expression of the actin-binding protein, thymosin β4 (Tβ4), has been reported to be elevated in a side population of small cells known as cancer stem cells in the breast cancer cell lines MCF7 and MDA-MB231.2 A recent study has also shown that colorectal cancer cells (CR-CSCs) from different patients that were sorted by CD133 had higher Tβ4 levels than normal colorectal cancer cells. Additionally, a lentiviral strategy to downregulate Tβ4 expression in CR-CSCs lowered the capacity of the cells to grow and migrate in culture, and reduced the tumour size and aggressiveness of CR-CSCs in xenografted mice.3 We have previously reported that Tβ4 levels in metastatic stomach cancers to the ovary were significantly upregulated compared with levels in normal stomachs and primary stomach cancers. Furthermore, Tβ4 expression was colocalised with CD133 expression in primary ovarian carcinomas, metastatic ovarian cancers from stomach cancers, and primary stomach cancers, suggesting that Tβ4 expression is strongly related to CD133 expression and is a characteristic of stem cells or cancer stem cells.4

In the present study, we compared the expression patterns of Tβ4 and CD133 in primary and recurrent colorectal cancer cells from the same patient. We obtained the paraffin-embedded primary and recurrent colorectal cancers of 10 patients. Tβ4 and CD133 expression …

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