Modifiers matching estrogen:

• endogenous,
• steroidal,
• natural,
• nonsteroidal,
• synthetic,
• carcinogenic,
• active,
• exogenous,

Simple categories matching carcinogenic:

• metal,
• substance,
• pathogen,
• hydrocarbon,
• agent,
• toxin,
• solvent,
• mycotoxin,
• preservative,
• process,
• material,
• mixture,
• chemical,
• compound,
• residue,
• condition,
• particle,
• habit,
• aldehyde,
• estrogen,
• fiber,
• contaminant,
• pesticide,
• gas,
• component,
• event,