The VNA are generally
potent carcinogens (e.g. N-nitrosodimethylamine (NDMA) and
N-nitrosopyrrolidine (NPYR)) whereas the NVNA are weak
carcinogens (N-nitrososarcosine (NSAR)), or assumed to be
non-carcinogenic (e.g. N-nitrosoproline (NPRO), N-nitrosohydroxyproline
(NHPRO), N-nitroso-thiazolidine-4-carboxylic
acid (NTCA) and N-nitroso-2-methyl-thiazolidine 4-carboxylic acid
(NMTCA))