Modifiers matching estrogen:

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

Simple categories matching carcinogenic:

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