INHA and neoplasm: To test this hypothesis, we measured activin A levels in Smad2flox/-; Inha-/-; Amhr2cre/+ mice and the corresponding control mice at the advanced tumor stage, and found that levels of activin A were similarly elevated in both Smad2flox/-; Inha-/- control (n = 11; 54.1 ± 8.2 ng/ml) and Smad2flox/-; Inha-/-; Amhr2cre/+ experimental females (n = 5; 47.0 ± 6.7 ng/ml) (P > 0.05) in comparison to WT females (n = 7; 0.1 ± 0.0 ng/ml).