| Study Attribute | Value |
|---|---|
| CEBS Accession Number: | 002-02429-0011-0000-1 |
| Chemical Name: | Methyl carbamate |
| CASRN: | 598-55-0 |
| NTP Study Type: | Genetic Toxicology - Mammalian Cell Mutagenicity |
| NTP Study ID: | 694447 |
| Study Result: | Negative |
Studies are indicated to be "Nontoxic" when the observed reductions in relative total growth did not indicate that the maximum tolerated dose was achieved.
| Conc. ug/mL | Cloning Efficiency | Relative Total Growth | Mutant Colonies | Mutant Frequency | Avg Mutant Frequency | ||
|---|---|---|---|---|---|---|---|
| Vehicle Control | Water | 0 | 82 | 104 | 44 | 18 | 19 |
| 101 | 85 | 49 | 16 | ||||
| 94 | 90 | 59 | 21 | ||||
| 100 | 121 | 62 | 21 | ||||
| Test Chemical | Methyl carbamate | 156 | 103 | 102 | 54 | 18 | 14 |
| 101 | 91 | 31 | 10 | ||||
313 | 100 | 84 | 56 | 19 | 17 | ||
| 103 | 105 | 45 | 15 | ||||
625 | 89# | 94 | 21 | 8 | 13 | ||
| 101 | 99 | 56 | 18 | ||||
1250 | 104 | 102 | 50 | 16 | 15 | ||
| 89 | 98 | 35 | 13 | ||||
2500 | 96 | 91 | 67 | 23 | 20 | ||
| 93 | 100 | 49 | 18 | ||||
5000 | 95 | 89 | 38 | 13 | 13 | ||
| 88 | 104 | 35 | 13 | ||||
| Positive Control | Ethyl Methane Sulfonate | 500 | 33 | 17 | 877 | 877 | 730* |
| 40 | 24 | 893 | 741 | ||||
| 65 | 31 | 1113 | 572 | ||||
| Conc. ug/mL | Cloning Efficiency | Relative Total Growth | Mutant Colonies | Mutant Frequency | Avg Mutant Frequency | ||
|---|---|---|---|---|---|---|---|
| Vehicle Control | Water | 0 | 76 | 97 | 46 | 20 | 16 |
| 81 | 104 | 40 | 16 | ||||
| 72 | 91 | 41 | 19 | ||||
| 81 | 109 | 22 | 9 | ||||
| Test Chemical | Methyl carbamate | 313 | 99 | 128 | 60 | 20 | 17 |
| 89 | 79 | 52 | 20 | ||||
| 79 | 116 | 28 | 12 | ||||
625 | 96 | 146 | 36 | 13 | 13 | ||
| 107 | 145 | 47 | 15 | ||||
| 91 | 144 | 35 | 13 | ||||
1250 | 106 | 145 | 36 | 11 | 10 | ||
| 110 | 183 | 23 | 7 | ||||
| 102 | 163 | 32 | 10 | ||||
2500 | 107 | 153 | 27 | 8 | 8 | ||
| 114 | 164 | 28 | 8 | ||||
| 121r | 169 | 33 | 9 | ||||
5000 | 124r | 141 | 27 | 7 | |||
| 123r | 157 | 37 | 10 | ||||
| 113 | 160 | 49 | 14 | ||||
| Positive Control | Ethyl Methane Sulfonate | 500 | 65 | 62 | 681 | 349 | 492* |
| 36 | 25 | 614 | 577 | ||||
| 44 | 27 | 720 | 550 | ||||
| Conc. ug/mL | Cloning Efficiency | Relative Total Growth | Mutant Colonies | Mutant Frequency | Avg Mutant Frequency | ||
|---|---|---|---|---|---|---|---|
| Vehicle Control | Water | 0 | 66 | 91 | 56 | 28 | 19 |
| 79 | 119 | 48 | 20 | ||||
| 77 | 101 | 34 | 15 | ||||
| 86 | 89 | 34 | 13 | ||||
| Test Chemical | Methyl carbamate | 313 | 80# | 78 | 55 | 23 | 26 |
| 69 | 79 | 65 | 31 | ||||
| 62 | 86 | 44 | 24 | ||||
625 | 80 | 69 | 63 | 26 | 24 | ||
| 57 | 65 | 36 | 21 | ||||
| 87 | 71 | 65 | 25 | ||||
1250 | 82 | 80 | 41 | 17 | 20 | ||
| 70 | 97 | 41 | 19 | ||||
| 73 | 72 | 52 | 24 | ||||
2500 | 75 | 78 | 34 | 15 | 18 | ||
| 100r | 83 | 0 | 0 | ||||
| 89 | 76 | 54 | 20 | ||||
5000 | 72# | 79 | 31.5 | 15 | 20 | ||
| 75 | 94 | 51 | 23 | ||||
| 71 | 74 | 48 | 23 | ||||
| Positive Control | 3-Methylcholanthrene | 7 | 66 | 49 | 229 | 116 | 111* |
| 60 | 57 | 182 | 101 | ||||
| 79 | 60 | 273 | 115 | ||||
| Conc. ug/mL | Cloning Efficiency | Relative Total Growth | Mutant Colonies | Mutant Frequency | Avg Mutant Frequency | ||
|---|---|---|---|---|---|---|---|
| Vehicle Control | Water | 0 | 109 | 119 | 52 | 16 | 17 |
| 106# | 95 | 51 | 16 | ||||
| 102# | 85 | 45 | 15 | ||||
| 101 | 101 | 60 | 20 | ||||
| Test Chemical | Methyl carbamate | 313 | 101 | 101 | 45 | 15 | 19 |
| 86 | 81 | 47 | 18 | ||||
| 104 | 77 | 78 | 25 | ||||
625 | 87 | 81 | 40 | 15 | 16 | ||
| 84 | 85 | 42 | 17 | ||||
| 94 | 74 | 46 | 16 | ||||
1250 | 87 | 93 | 39 | 15 | 16 | ||
| 93# | 90 | 48 | 17 | ||||
| 82 | 84 | 37 | 15 | ||||
2500 | 104 | 117 | 47 | 15 | 16 | ||
| 79 | 106 | 37 | 16 | ||||
| 86# | 94 | 46.5 | 18 | ||||
5000 | 82 | 91 | 52 | 21 | 18 | ||
| 96 | 90 | 49 | 17 | ||||
| 83 | 83 | 37 | 15 | ||||
| Positive Control | 3-Methylcholanthrene | 7 | 106 | 63 | 278 | 88 | 90* |
| 91 | 60 | 248 | 91 | ||||
| 87 | 57 | 236 | 90 | ||||
| Conc. ug/mL | Cloning Efficiency | Relative Total Growth | Mutant Colonies | Mutant Frequency | Avg Mutant Frequency | ||
|---|---|---|---|---|---|---|---|
| Vehicle Control | Water | 0 | 112 | 90 | 86 | 26 | 22 |
| 99# | 118 | 78 | 26 | ||||
| 88 | 93 | 55 | 21 | ||||
| 80 | 98 | 35 | 15 | ||||
| Test Chemical | Methyl carbamate | 156 | 98 | 101 | 57 | 19 | 23 |
| 71 | 78 | 58 | 27 | ||||
313 | 110 | 82 | 85 | 26 | |||
| 127r | 112 | 69 | 18 | ||||
625 | 77# | 102 | 48 | 21 | 23 | ||
| 71 | 106 | 53 | 25 | ||||
1250 | 100 | 98 | 95 | 32 | 27 | ||
| 92 | 99 | 61 | 22 | ||||
2500 | 99 | 103 | 58 | 20 | 20 | ||
| 79# | 96 | 49.5 | 21 | ||||
5000 | 97 | 112 | 70 | 24 | 22 | ||
| 104 | 94 | 63 | 20 | ||||
| Positive Control | 3-Methylcholanthrene | 5 | 40 | 16 | 392 | 328 | 314* |
| 39 | 17 | 402 | 342 | ||||
| 47 | 23 | 385 | 273 | ||||
| Conc. ug/mL | Cloning Efficiency | Relative Total Growth | Mutant Colonies | Mutant Frequency | Avg Mutant Frequency | ||
|---|---|---|---|---|---|---|---|
| Vehicle Control | Water | 0 | 75 | 92 | 32 | 14 | 15 |
| 81 | 108 | 36 | 15 | ||||
| 82 | 99 | 28 | 11 | ||||
| 75 | 101 | 42 | 19 | ||||
| Test Chemical | Methyl carbamate | 313 | 78 | 61 | 46 | 20 | 24* |
| 46 | 55 | 39 | 28 | ||||
| 62 | 77 | 44 | 24 | ||||
625 | 41 | 44 | 31 | 26 | 28* | ||
| 78 | 89 | 43 | 18 | ||||
| 51 | 56 | 63 | 41 | ||||
1250 | 79 | 79 | 69 | 29 | 22 | ||
| 77 | 93 | 49 | 21 | ||||
| 68 | 71 | 30 | 15 | ||||
2500 | 92 | 99 | 56 | 20 | 21 | ||
| 81 | 118 | 43 | 18 | ||||
| 55 | 57 | 42 | 26 | ||||
5000 | 64 | 88 | 39 | 20 | 20 | ||
| 87 | 94 | 34 | 13 | ||||
| 70 | 81 | 57 | 27 | ||||
| Positive Control | 3-Methylcholanthrene | 5 | 43 | 19 | 232 | 181 | 190* |
| 44 | 16 | 299 | 227 | ||||
| 51 | 19 | 248 | 164 | ||||
Asterisks(*) indicate significant responses.
r = rejected value due to quality control criteria
# = reduced sample size because of the loss of one culture dish due to contamination