BACKGROUND: Tumor-infiltrating lymphocytes (TIL) are strictly divided into two categories: those lymphocytes in stroma and those in between cancer cells. However, there has been no fully adequate comparison of these two categories, especially analysis in relation to microsatellite instability (MSI). METHODS: The materials were derived from patients with colorectal cancer who underwent surgery in Jichi Medical School and Omiya Medical Center. There were 19 hereditary non-polyposis colorectal cancer (HNPCC) patients who were compatible with Japanese criteria A and 106 patients with sporadic colorectal cancer (sCRC) in either Dukes B or C stage. As microsatellite markers, the global standard five markers were selected. Immunohistochemical analysis was performed using the anti-CD3, -CD4, -CD8 and -S-100 antibodies and the results were evaluated according to the degree of infiltration, which was classified into three grades. RESULTS: As for stroma-infiltrating lymphocytes (SIL) in sCRCs, severe infiltration was observed in 20% of high microsatellite instability (MSI-H) patients and 12.8% of low microsatellite instability (MSI-L)/stable microsatellite (MSS) patients without a statistically significant difference. In contrast, severe infiltration of intra-tumor cell-infiltrating lymphocytes (ITCIL) was observed in 41.7% of MSI-H sCRC patients and 4.3% of MSI-L/MSS patients. Thus, there was a close correlation between ITCIL severity and increased microsatellite instability (P < 0.001). In examination of ITCIL, patients with severe infiltration tended to show a better survival rate than those with moderate or mild infiltration. CONCLUSIONS: The present study suggests that different factors are involved in the infiltration of SIL and ITCIL. Although there were no statistically significant differences, the cumulative survival rates tended to be higher in severe ITCIL cases than in those with moderate and poor ITCIL (P < 0.09). We suggest that there might be a possibility of ITCIL having a role for a better prognosis after colorectal cancer surgery, which is closely related to MSI.
BACKGROUND:Tumor-infiltrating lymphocytes (TIL) are strictly divided into two categories: those lymphocytes in stroma and those in between cancer cells. However, there has been no fully adequate comparison of these two categories, especially analysis in relation to microsatellite instability (MSI). METHODS: The materials were derived from patients with colorectal cancer who underwent surgery in Jichi Medical School and Omiya Medical Center. There were 19 hereditary non-polyposis colorectal cancer (HNPCC) patients who were compatible with Japanese criteria A and 106 patients with sporadic colorectal cancer (sCRC) in either Dukes B or C stage. As microsatellite markers, the global standard five markers were selected. Immunohistochemical analysis was performed using the anti-CD3, -CD4, -CD8 and -S-100 antibodies and the results were evaluated according to the degree of infiltration, which was classified into three grades. RESULTS: As for stroma-infiltrating lymphocytes (SIL) in sCRCs, severe infiltration was observed in 20% of high microsatellite instability (MSI-H) patients and 12.8% of low microsatellite instability (MSI-L)/stable microsatellite (MSS) patients without a statistically significant difference. In contrast, severe infiltration of intra-tumor cell-infiltrating lymphocytes (ITCIL) was observed in 41.7% of MSI-H sCRC patients and 4.3% of MSI-L/MSSpatients. Thus, there was a close correlation between ITCIL severity and increased microsatellite instability (P < 0.001). In examination of ITCIL, patients with severe infiltration tended to show a better survival rate than those with moderate or mild infiltration. CONCLUSIONS: The present study suggests that different factors are involved in the infiltration of SIL and ITCIL. Although there were no statistically significant differences, the cumulative survival rates tended to be higher in severe ITCIL cases than in those with moderate and poor ITCIL (P < 0.09). We suggest that there might be a possibility of ITCIL having a role for a better prognosis after colorectal cancer surgery, which is closely related to MSI.
Authors: Laura S Rozek; Stephanie L Schmit; Joel K Greenson; Lynn P Tomsho; Hedy S Rennert; Gad Rennert; Stephen B Gruber Journal: J Natl Cancer Inst Date: 2016-05-12 Impact factor: 13.506
Authors: Juha P Väyrynen; Juha O Vornanen; Sara Sajanti; Jan P Böhm; Anne Tuomisto; Markus J Mäkinen Journal: Virchows Arch Date: 2012-04-24 Impact factor: 4.064
Authors: Vanessa Deschoolmeester; Marc Baay; Eric Van Marck; Joost Weyler; Peter Vermeulen; Filip Lardon; Jan B Vermorken Journal: BMC Immunol Date: 2010-04-12 Impact factor: 3.615
Authors: Frank A Sinicrope; Rafaela L Rego; Stephen M Ansell; Keith L Knutson; Nathan R Foster; Daniel J Sargent Journal: Gastroenterology Date: 2009-07-03 Impact factor: 22.682