PubMed notes some studies about Chlorophyll/Chlorophyllin and cancer. It may be that the very fact that it ISN'T absorbed can make it beneficial as it tends to bind to some mutagens/carcinogens to prevent THEIR absorption:
Inhibitory effect of chlorophyllin on PhIP-induced mammary carcinogenesis in female F344 rats - PubMedInhibitory activity of chlorophyllin on the genotoxicity of carcinogens in Drosophila - PubMed
Not all the studies are clear, though, as variance in concentrations can actually PROMOTE carcinogenesis:
Promotion versus suppression of rat colon carcinogenesis by chlorophyllin and chlorophyll: modulation of apoptosis, cell proliferation, and beta-catenin/Tcf signaling - PubMed
And even when it helps suppress SOME kind of cancers, keeping those carcinogens in the bowels seem to promote colorectal tumors:
Chlorophyllin, an antimutagen, acts as a tumor promoter in the rat-dimethylhydrazine colon carcinogenesis model - PubMed
Looks like something of a mixed bag. Pretty much like any other one single chemical or compound.
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