Background: Deep vein thrombosis is a condition, which has several acquired as well as genetic causes. One of the most common reasons for deep vein thrombosis is activated protein C resistance caused by Factor V Leiden.
Method: We examined the risk posed by Factor V Leiden, Hong Kong/Cambridge and HR2 Haplotype mutations in 155 deep vein thrombosis patients and 120 healthy controls in the background of activated protein C resistance.
Result: Thirty-one of our patients showed activated protein C resistance of which only 16 carried Factor V Leiden mutation which was a far lower number than what is usually seen in Caucasian population. Factor V Leiden mutation was significantly associated with the risk of deep vein thrombosis (Yates corrected p-value=0.002; 95%CI; odds ratio: 13.7). Factor V Hong Kong/Cambridge and HR2 Haplotype were not found to be associated with the risk of deep vein thrombosis. There is a possibility that Factor V HR2 Haplotype might also be associated with activated protein C resistance even in the absence of Factor V Leiden.
Conclusions: Factor V Leiden mutation was seen to contribute far less towards activated protein C resistance in Asian-Indian deep vein thrombosis patients than what has been commonly observed in Caucasians.