However, tumor accumulation was higher in small-size tumors, where competitive block of SCK-folate uptake with excess folate was observed.

• 但在小型肿瘤内，纳米颗粒在肿瘤内的聚集量较高，且过量叶酸能竞争性封闭肿瘤对SCK-叶酸的摄取。