proto-oncogenic

-ic

Used to form adjectives from nouns with the meaning “of or pertaining to”. · (chemistry) Used to denote certain chemical compounds in which a specified chemical element has a greater oxidation number than in the equivalent compound whose name ends in the suffix -ous. For example sulphuric acid (H₂SO₄) has more oxygen atoms per molecule than sulphurous acid (H₂SO₃).

也可拆解为

proto-

An early, primitive stage of development. · Original, older.