https://www.frontiersin.org/articles/10.3389/fphar.2019.01614/full
Allicin in elephant garlic (what you normally get in the store) is about 1/4 as potent as real garlic. Siberian garlic has the most allicin from what I have read.
Allicin, one of the main organic allyl sulfur components in garlic (Allium sativum, Amaryllidaceae), was examined for its effects on cholangiocarcinoma (CCA) (Chen et al., 2018). In BALB/c nude mice model of CCA, allicin (10 mg/kg) significantly suppressed the growth of human liver bile duct carcinoma (HuCCT-1). The in vitro molecular study showed that allicin (20 µM) reduced the levels of matrix metalloproteinase (MMP)-2 and -9, via reducing the activity of the STAT3 signaling pathway to decrease migration, invasion, and epithelial-mesenchymal transition (EMT) of HuCCT-1 cell. Additionally, allicin suppressed proliferation by activating the caspase cascade, inducing apoptosis, and reducing the expression of proteins downstream of STAT3, such as B-cell lymphoma 2 (Bcl-2), while upregulating Bcl-2-associated X (Bax) protein (Chen et al., 2018). Subsequent studies, showed that allicin (5 µM) altered TIMP/MMP balance, via reducing the activity of the PI3K/AKT signaling pathway thereby significantly inhibiting adhesion, invasion, and migration of lung adenocarcinoma A549 and H1299 cells (Huang et al., 2017).