2-Amino-5-phenylpyridine is a mutagenic heterocyclic aromatic amine that is formed by pyrolysis of phenylalanine in proteins. 2-Amino-5-phenylpyridine is in broiled sardines and is considered as potentially carcinogenic[1][2].
On the other hand, the chemical structure of 5-phenyl-2-pyridinamine (PPA) shows a great resemblance to the aminobiphenyls, another well known class of carcinogenic aromatic amines[2].
[1]. Dooley KL, et al. Comparative carcinogenicity of the food pyrolysis product, 2-amino-5-phenylpyridine, and the known human carcinogen, 4-aminobiphenyl, in the neonatal B6C3F1 mouse. Cancer Lett. 1988 Jul;41(1):99-103. [2]. Stavenuiter JF, et al. Syntheses of 5-phenyl-2-pyridinamine, a possibly carcinogenic pyrolysis product of phenylalanine, and some of its putative metabolites. Carcinogenesis. 1985 Jan;6(1):13-9.