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Table 1 Therapeutic effectiveness of Anti-MDM2 oligonucleotide administered alone or in combination with cytotoxic agents in animals bearing LS174T xenografts

From: Anti-Tumor Efficacy of a Novel Antisense Anti-MDM2 Mixed-Backbone Oligonucleotide in Human Colon Cancer Models: p53-Dependent and p53-Independent Mechanisms

   

+ASM

+ Anti-MDM2 AS

Day

 

No Oligo [1] (% T:C)

[2] (% T:C)

Ratio (%) ([2]/[1])

[3] (% T:C)

Ratio (%) ([3])/[1])

3

Oligo alone

100

99

99

51

51

 

HCPT

74

103

138

37

49

 

5-FU

50

51

102

47

94

6

Oligo alone

100

105

105

44

44

 

HCPT

41

55

134

24

58

 

5-FU

40

67

167

38

96

9

Oligo alone

100

70

70

30

30

 

HCPT

30

32

107

15

50

 

5-FU

33

51

156

35

108

12

Oligo alone

100

82

82

34

34

 

HCPT

44

37

85

15

34

 

5-FU

40

39

99

29

73

15

Oligo alone

100

79

79

45

45

 

HCPT

49

37

75

16

32

 

5-FU

41

39

95

22

53

18

Oligo alone

100

73

73

37

37

 

HCPT

51

32

63

12

24

 

5-FU

45

33

72

11

24

  1. The ratio ([2])/[1] or [3]/[1]) can be used to illustrate the potential additive or synergistic effects when the oligos were given in combination with cytotoxic agents. When the ratio for combination therapy is less thatn 100% (compared to cytotoxic agents alone), an effect of antisense oligo is indicated. If the ratio for combination therapy is the same as that of oligo treatment alone, an additive effect is indicated. If the ratio for combination therapy is significantly less than that of oligo treatment alone, a synergistic effect is indicated. For example, at the end of the experiment (day 18), the ratio for 5-FU + AS/5-FU is 24% (10.9%/45%) and less than 100%, indicating an effect of oligo AS, and, in addition, this ratio is less than the ratio for oligo AS alone (37%; AS/Saline), indicating a synergistic effect between 5-FU and Oligo AS. The ratio for 5-FU + ASM/5-FU is 72% (33%/45%) and less than 100%, indicating an effect of oligo ASM; however, this ratio is almost the same as the ratio for oligo ASM alone (73%), indicating no synergistic effect, but an additive effect, between 5-FU and Oligo ASM. In conclusion, additive or synergistic effects between HCPT and Oligo AS were found throughout the treatment period. Additive or synergistic effects between 5-FU and Oligo AS were found only on days 15 and 18. No additive or synergistic effects between Oligo ASM and HCPT or 5-FU were found, except for HCPT + ASM on days 15 and 18 and 5-FU + ASM on day 18. An additive effect between HCPT and ASM was found on these days.