Would you consider tamoxifen to be contraindicated for chemoprevention in patients with a history of OCP induced VTE?   

Absolutely, yes. SERMs are contraindicated in women who have a history of thrombosis and in women who are pregnant, planning to become pregnant, or are breastfeeding. SERMs are also relatively contraindicated in patients with increased risk of thrombosis, such as those who smoke or have a familial p...