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char = (;code = 40
char = a;code = 97
char = b;code = 98
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char = );code = 41
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char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = p;code = 112
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = e;code = 101
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = u;code = 117
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = j;code = 106
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = .;code = 46
result sql = Toxicity and efficacy of radioimmunotherapy in carcinoembryonic antigen-producing medullary thyroid cancer xenograft: comparison of iodine 131-labeled F(ab')2 and pretargeted bivalent hapten and evaluation of repeated injections.
Toxicity and efficacy of radioimmunotherapy in carcinoembryonic antigen-producing medullary thyroid cancer xenograft: comparison of iodine 131-labeled F(ab')2 and pretargeted bivalent hapten and evaluation of repeated injections.
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char = e;code = 101
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char = A;code = 65
char = E;code = 69
char = S;code = 83
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = n;code = 110
char = r;code = 114
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = b;code = 98
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = F;code = 70
char = 6;code = 54
char = ,;code = 44
char = ;code = 32
char = F;code = 70
char = 6;code = 54
char = -;code = 45
char = 7;code = 55
char = 3;code = 51
char = 4;code = 52
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = b;code = 98
char = o;code = 111
char = d;code = 100
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = n;code = 110
char = r;code = 114
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = b;code = 98
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = p;code = 112
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = e;code = 101
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = j;code = 106
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = F;code = 70
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = A;code = 65
char = E;code = 69
char = S;code = 83
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = b;code = 98
char = o;code = 111
char = d;code = 100
char = y;code = 121
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = j;code = 106
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = 4;code = 52
char = 8;code = 56
char = ;code = 32
char = h;code = 104
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = p;code = 112
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = n;code = 110
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = ,;code = 44
char = ;code = 32
char = h;code = 104
char = e;code = 101
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = o;code = 111
char = l;code = 108
char = o;code = 111
char = g;code = 103
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = u;code = 117
char = m;code = 109
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = u;code = 117
char = m;code = 109
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = r;code = 114
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = 5;code = 53
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = h;code = 104
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = t;code = 116
char = ;code = 32
char = 9;code = 57
char = 2;code = 50
char = .;code = 46
char = 5;code = 53
char = ;code = 32
char = M;code = 77
char = B;code = 66
char = q;code = 113
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = A;code = 65
char = E;code = 69
char = S;code = 83
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = F;code = 70
char = 6;code = 54
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 0;code = 48
char = 4;code = 52
char = );code = 41
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = u;code = 117
char = k;code = 107
char = o;code = 111
char = c;code = 99
char = y;code = 121
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = A;code = 65
char = E;code = 69
char = S;code = 83
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = F;code = 70
char = 6;code = 54
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = 3;code = 51
char = 7;code = 55
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 9;code = 57
char = 2;code = 50
char = .;code = 46
char = 5;code = 53
char = ;code = 32
char = M;code = 77
char = B;code = 66
char = q;code = 113
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 1;code = 49
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 4;code = 52
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = );code = 41
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = A;code = 65
char = E;code = 69
char = S;code = 83
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = 9;code = 57
char = 2;code = 50
char = .;code = 46
char = 5;code = 53
char = -;code = 45
char = M;code = 77
char = B;code = 66
char = q;code = 113
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 4;code = 52
char = );code = 41
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = p;code = 112
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = j;code = 106
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = w;code = 119
char = i;code = 105
char = c;code = 99
char = e;code = 101
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char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = A;code = 65
char = E;code = 69
char = S;code = 83
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char = r;code = 114
char = e;code = 101
char = a;code = 97
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char = e;code = 101
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char = t;code = 116
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char = x;code = 120
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char = c;code = 99
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char = t;code = 116
char = y;code = 121
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char = a;code = 97
char = s;code = 115
char = ;code = 32
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char = o;code = 111
char = t;code = 116
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char = s;code = 115
char = i;code = 105
char = g;code = 103
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char = f;code = 102
char = i;code = 105
char = c;code = 99
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char = t;code = 116
char = l;code = 108
char = y;code = 121
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char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = t;code = 116
char = e;code = 101
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char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = s;code = 115
char = e;code = 101
char = c;code = 99
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char = d;code = 100
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char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = u;code = 117
char = m;code = 109
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = o;code = 111
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char = s;code = 115
char = e;code = 101
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char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = s;code = 115
char = e;code = 101
char = r;code = 114
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = b;code = 98
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char = t;code = 116
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
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char = y;code = 121
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char = l;code = 108
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 7;code = 55
char = 4;code = 52
char = ;code = 32
char = M;code = 77
char = B;code = 66
char = q;code = 113
char = ;code = 32
char = A;code = 65
char = E;code = 69
char = S;code = 83
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = l;code = 108
char = e;code = 101
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char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = ;code = 32
char = =;code = 61
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result sql = This study compared the toxicity and efficacy of 131I-labeled bivalent hapten pretargeted by anti-carcinoembryonic antigen (CEA)/anti-N alpha-(diethylenetriamine-N,N,N',N''-tetraacetic acid-indium(F6-734) bispecific antibody [affinity enhancement system (AES) reagents] with 131I-labeled anti-CEA F(ab')2 (131I-F6) in mice grafted with a human medullary thyroid carcinoma. Repeated injections of AES reagents were also evaluated. Mice bearing TT tumor xenografts were treated with 37, 74, or 92.5 MBq of AES reagents, two injections of 74 MBq of AES reagents 45 days apart, or 37 or 92.5 MBq of 131I-F6. Control groups were treated with nonspecific 131I-labeled F(ab')2, nonspecific AES reagents, nonradiolabeled F6, F6-734 bispecific antibody, and nonradiolabeled bivalent hapten or received no injection. For AES treatments, bispecific antibody was injected 48 h before the hapten. Animal weight, hematological toxicity, tumor volume, and serum thyrocalcitonin were monitored during 5 months. At 92.5 MBq, weight loss was significantly lower after AES than F6 treatment (P = 0.004). The percentages of leukocyte count changes were significantly lower after AES than F6 at 37 and 92.5 MBq (P = 0.01 and 0.04, respectively). The percentage of platelet count changes was significantly lower with AES at the 92.5-MBq dose level (P = 0.04). In the group injected twice with AES reagents, toxicity was not significantly increased after the second treatment. Tumor response was observed in all cases but was significantly longer with repeated treatments of 74 MBq AES reagents than with a single treatment (P = 0.004). Two complete responses were observed with repeated treatments. Changes in thyrocacitonin level paralleled those in tumor volume. These results indicate that pretargeted radioimmunotherapy was at least as efficient as one-step radioimmunotherapy and markedly less toxic. Repeated treatments with AES reagents increased efficacy without increasing toxicity.

Publication: Clin. Cancer Res. 1999 Oct ;5(10 Suppl)::3183s-3189s.
Publication Date: 1999 Oct
Study Author(s): Kraeber-Bodéré, F;Faivre-Chauvet, A;Saï-Maurel, C;Campion, L;Fiche, M;Gautherot, E;Le Boterff, J;Barbet, J;Chatal, J F;Thédrez, P;
Institution: Institut National de la Santé et de la Recherche Médicale, Research Unit 463, Nantes, France.
Shortcut link to this study:
This study compared the toxicity and efficacy of 131I-labeled bivalent hapten pretargeted by anti-carcinoembryonic antigen (CEA)/anti-N alpha-(diethylenetriamine-N,N,N',N''-tetraacetic acid-indium(F6-734) bispecific antibody [affinity enhancement system (AES) reagents] with 131I-labeled anti-CEA F(ab')2 (131I-F6) in mice grafted with a human medullary thyroid carcinoma. Repeated injections of AES reagents were also evaluated. Mice bearing TT tumor xenografts were treated with 37, 74, or 92.5 MBq of AES reagents, two injections of 74 MBq of AES reagents 45 days apart, or 37 or 92.5 MBq of 131I-F6. Control groups were treated with nonspecific 131I-labeled F(ab')2, nonspecific AES reagents, nonradiolabeled F6, F6-734 bispecific antibody, and nonradiolabeled bivalent hapten or received no injection. For AES treatments, bispecific antibody was injected 48 h before the hapten. Animal weight, hematological toxicity, tumor volume, and serum thyrocalcitonin were monitored during 5 months. At 92.5 MBq, weight loss was significantly lower after AES than F6 treatment (P = 0.004). The percentages of leukocyte count changes were significantly lower after AES than F6 at 37 and 92.5 MBq (P = 0.01 and 0.04, respectively). The percentage of platelet count changes was significantly lower with AES at the 92.5-MBq dose level (P = 0.04). In the group injected twice with AES reagents, toxicity was not significantly increased after the second treatment. Tumor response was observed in all cases but was significantly longer with repeated treatments of 74 MBq AES reagents than with a single treatment (P = 0.004). Two complete responses were observed with repeated treatments. Changes in thyrocacitonin level paralleled those in tumor volume. These results indicate that pretargeted radioimmunotherapy was at least as efficient as one-step radioimmunotherapy and markedly less toxic. Repeated treatments with AES reagents increased efficacy without increasing toxicity.
PMID: 10541362

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