THBS1 and cancer: The preincubation of these inhibitory platelet lysates from cancer patients revealed elevated levels of TSP-1 in both cases with antibodies against TSP-l (200 μg/ml) resulted in an increase in the CTF of HUVEC as compared with these inhibitory platelet lysates preincubated with IgG control (5μg/ml) (P<0.05, n = 3) (Figure 4.