2B 類致癌物（英語：Group 2B carcinogens），為國際癌症研究機構（International Agency for Research on Cancer，IARC）對致癌物質的分類，此類物質（或其混合物）可能對人類致癌。現有 236 類物質（如黃樟素、四氯化碳、電磁波、抗甲狀腺藥物丙硫氧嘧啶（propylthiouracil）、二異氰酸甲苯、抗愛滋病藥物齊多夫定（zidovudine）、汽油引擎廢氣、乾洗業等），對人類為有可能致癌物，對動物為很可能也是致癌物。更多詳細信息，可以搜尋國際癌症研究機構（IARC）專著。



物質和物質組合


* 3-Chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone

* Chloroform

* 1-Chloro-2-methylpropene

* Chlorophenoxy herbicides

* 4-Chloro-ortho-phenylenediamine

* Chloroprene

* Chlorothalonil

* Chrysene

* CI Acid Red 114

* CI Basic Red 9

* CI Direct Blue 15

* Citrus Red No. 2

* Cobalt and cobalt compounds 1

* Cobalt sulfate and other soluble cobalt(II) salts

* Coconut oil diethanolamine condensate

* para-Cresidine

* Cycasin

* Dacarbazine

* Dantron (Chrysazin, 1,8-Dihydroxyanthraquinone)

* Daunomycin

* DDT (_p_,_p'_-DDT)

* N,N'-Diacetylbenzidine

* 2,4-Diaminoanisole

* 4,4'-Diaminodiphenyl ether

* 2,4-Diaminotoluene

* Dibenz[_a,h_]acridine

* Dibenz[_a,j_]acridine

* 7_H_-Dibenzo[_c,g_]carbazole

* Dibenzo[_a,e_]pyrene

* Dibenzo[_a,h_]pyrene

* Dibenzo[_a,i_]pyrene

* 1,2-Dibromo-3-chloropropane

* 2,3-Dibromopropan-1-ol

* Dichloroacetic acid

* para-Dichlorobenzene

* 3,3'-Dichlorobenzidine

* 3,3'-Dichloro-4,4'-diaminodiphenyl ether

* 1,2-Dichloroethane

* Dichloromethane (methylene chloride)

* 1,3-Dichloropropene (technical grade)

* Dichlorvos

* 1,2-Diethylhydrazine

* Diglycidyl resorcinol ether

* Dihydrosafrole

* Diisopropyl sulfate

* 3,3'-Dimethoxybenzidine (_o_-Dianisidine)

* para-Dimethylaminoazobenzene

* _trans_-2-[(Dimethylamino)methylimino]-5-[2-(5-nitro-2-furyl)-vinyl]-1,3,4-oxadiazole

* 2,6-Xylidine (2,6-Dimethylaniline)

* 3,3'-Dimethylbenzidine (_o_-Tolidine)

* 1,1-Dimethylhydrazine

* 3,7-Dinitrofluoranthene

* 3,9-Dinitrofluoranthene

* 1,6-Dinitropyrene

* 1,8-Dinitropyrene

* 2,4-Dinitrotoluene

* 2,6-Dinitrotoluene

* 1,4-Dioxane

* Disperse Blue 1

* 1,2-Epoxybutane

* Ethyl acrylate

* Ethylbenzene

* Ethylene dichloride

* Ethyl methanesulfonate

* Foreign bodies, implanted in tissues

　
: : Polymeric, prepared as thin smooth films (with the exception of poly(glycolic acid))

　
: Metallic, prepared as thin smooth films

　
: Metallic cobalt, metallic nickel and an alloy powder containing 66-67% nickel, 13-16% chromium and 7% iron


* 2-(2-Formylhydrazino)-4-(5-nitro-2-furyl)thiazole

* Fumonisin B1

* Furan

* Glu-P-1 (2-Amino-6-methyldipyrido[1,2-_a_:3',2'-_d_]imidazole)

* Glu-P-2 (2-Aminodipyrido[1,2-_a_:3',2'-_d_]imidazole)

* Glycidaldehyde

* Griseofulvin

* HC Blue No. 1

* Heptachlor

* Hexachlorobenzene

* Hexachloroethane

* Hexachlorocyclohexanes

* Hexamethylphosphoramide (HMPA)

* Human immunodeficiency virus type 2 (infection with)

* Human papillomaviruses: some types other than 16, 18, 31 and 33

* Hydrazine

* 1-Hydroxyanthraquinone

* Indeno[1,2,3-_cd_]pyrene

* Iron-dextran complex

* Isoprene

* Lasiocarpine

* Lead

* Magnetic fields (extremely low frequency)

* MeA-a-C (2-Amino-3-methyl-9_H_-pyrido[2,3-_b_]indole)

* Medroxyprogesterone acetate

* MeIQ (2-Amino-3,4-dimethylimidazo[4,5-_f_]quinoline)

* MeIQx (2-Amino-3,8-dimethylimidazo[4,5-_f_]quinoxaline)

* Merphalan

* 2-Methylaziridine (Propyleneimine)

* Methylazoxymethanol acetate

* 5-Methylchrysene

* 4,4'-Methylene bis(2-methylaniline)

* 4,4'-Methylenedianiline

* Methylmercury compounds 1

* 2-Methyl-1-nitroanthraquinone (uncertain purity)

* N-Methyl-N-nitrosourethane

* Methylthiouracil

* Metronidazole

* Michler's base (4,4'-methylene-bis(_N_,_N_-dimethyl)benzenamine)

* Michler's ketone (4,4'-bis(dimethylamino)benzophenone)

* Microcystin-LR

* Mirex

* Mitomycin C

* Mitoxantrone

* Monocrotaline

* 5-(Morpholinomethyl)-3-[(5-nitrofurfurylidene)amino]-2-oxazolidinone

* Nafenopin

* Naphthalene

* Nickel, metallic and alloys

* Niridazole

* Nitrilotriacetic acid and its salts 1

* 5-Nitroacenaphthene

* 2-Nitroanisole

* Nitrobenzene

* 6-Nitrochrysene

* Nitrofen (technical-grade)

* 2-Nitrofluorene

* 1-[(5-Nitrofurfurylidene)amino]-2-imidazolidinone

* _N_-[4-(5-Nitro-2-furyl)-2-thiazolyl]acetamide

* Nitrogen mustard _N_-oxide

* Nitromethane

* 2-Nitropropane

* 1-Nitropyrene

* 4-Nitropyrene

* N-Nitrosodi-n-butylamine

* N-Nitrosodiethanolamine

* N-Nitrosodi-n-propylamine

* 3-(N-Nitrosomethylamino)propionitrile

* N-Nitrosomethylethylamine

* N-Nitrosomethylvinylamine

* N-Nitrosomorpholine

* N-Nitrosopiperidine

* N-Nitrosopyrrolidine

* N-Nitrososarcosine

* Ochratoxin A

* Oestrogen-progestogen therapy, postmenopausal

* Oil Orange SS

* Oxazepam

* Palygorskite (attapulgite) (long fibres, >5µm)

* Panfuran S (containing dihydroxymethylfuratrizine)

* Phenazopyridine hydrochloride

* Phenobarbital

* Phenolphthalein

* Phenoxybenzamine hydrochloride

* Phenyl glycidyl ether

* Phenytoin

* PhIP (2-amino-1-methyl-6-phenylimidazo(4,5-b)pyridine)

* Polychlorophenols and their sodium salts (mixed exposures)

* Ponceau MX

* Ponceau 3R

* Potassium bromate

* Progestins

* Progestogen-only contraceptives

* 1,3-Propane sultone

* β-Propiolactone

* Propylene oxide

* 硫月尿酮（Propylthiouracil、PTU），抗甲狀腺藥物

* Radiofrequency electromagnetic fields, such as, but not limited to, those associated with wireless phones

* Refractory ceramic fibres

* Riddelliine

* 黃樟素 Safrole

* _Schistosoma japonicum_ (infection with)

* Sodium _ortho_-phenylphenate

* Special-purpose fibres such as E-glass and '475' glass fibres

* Sterigmatocystin

* Streptozotocin

* Styrene

* Sulfallate

* Tetrafluoroethylene

* Tetranitromethane

* Thioacetamide

* 4,4'-Thiodianiline

* Thiouracil

* Titanium dioxide

* 二異氰酸甲苯（2,4-Toluene diiso-cyanate, 2,4-TDI）

* Trichlormethine (Trimustine hydrochloride)

* Trp-P-1 (3-Amino-1,4-dimethyl-5_H_-pyrido[4,3-_b_]indole)

* Trp-P-2 (3-Amino-1-methyl-5_H_-pyrido[4,3-_b_]indole)

* Trypan blue

* Uracil mustard

* Vanadium pentoxide

* Vinyl acetate

* 4-Vinylcyclohexene

* 4-Vinylcyclohexene diepoxide

* Zalcitabine

* 齊多夫定（Zidovudine，AZT）



混合物


* 瀝青

* 角叉菜膠

* 氯化石蠟

* 柴油

* 汽油發動機尾氣

* 重油

* 汽油

* 品紅染料

* 醃、泡製的蔬菜（一些亞洲傳統食品）

* 多溴化聯苯（多溴聯苯標準品）

* 毒殺芬（多氯莰烯）

* 串珠鐮刀菌分泌的毒素

* 焊接煙塵



接觸場合


* 房屋建材與木工裝潢

* 鈷（未存放於碳化鎢盒內）

* 乾洗

* 消防

* 印刷過程

* 滑石粉（粉塵）

* 紡織工業（生產過程）



注釋

腳註


* ^1 Evaluated as a group.

* ^2 There is limited evidence in humans that coffee drinking is carcinogenic in the urinary bladder.

* ^3 There is some evidence of an inverse relationship between coffee drinking and cancer of the large bowel.



引用



外部連結


* 致癌物分類表描述，國際癌症研究機構
  
* 致癌物分類表（最新版本）
  
* （頁面存檔備份，存於網際網路檔案館）（2015 年 11 月 5 日更新）