Modifiers matching estrogen:

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

Simple categories matching carcinogenic:

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