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Table 2 Aberrant protein expression in dMMR patients

From: Comparison of immunological characteristics between paired mismatch repair-proficient and -deficient colorectal cancer patients

Aberrant protein expression

Number of cases (n, %)

MMR (1)

60 (36.8)

 MLH1

11 (6.7)

 MSH2

5 (3.1)

 MSH6

35 (21.5)

 PMS2

9 (5.5)

MMR (2)

85 (52.1)

 MLH1 + MSH2

1 (0.6)

 MLH1 + MSH6

2 (1.2)

 MLH1 + PMS2

49 (30.1)

 MSH2 + MSH6

30 (18.4)

 MSH2 + PMS2

2 (1.2)

 MSH6 + PMS2

1 (0.6)

MMR (3)

13 (8.0)

 MLH1 + MSH2 + PMS2

4 (2.5)

 MLH1 + MSH6 + PMS2

6 (3.7)

 MLH1 + MSH2 + MSH6

2 (1.2)

 MSH2 + MSH6 + PMS2

1 (0.6)

MMR (4)

5 (3.1)

  1. MMR (1): negative expression of only one MMR protein
  2. MMR (2): concurrent negative expression of two MMR proteins
  3. MMR (3): concurrent negative expression of three MMR proteins
  4. MMR (4): concurrent negative expression of four MMR proteins