A higher concentration of γ-tocotrienol treatment (24.4 μM for 24 h [50], 40 and 80 μM for 24 h [46], 40 μM for 24 h [47,49]) or δ-tocotrienol (15 & 20 μM for 16 h [44], 25.2 μM for 24 h [50], 37.8 μM for 18 h [52] or 50.4 μM for 16 h [51]) significantly upregulated Grp78 level on cervical cancer HeLa cells, melanoma BLM and A375 cells, or mammary tumor MCF-7 and MDA-MB-231 cells. Here, HSPA5 is linked to breast cancer.