Ummmmmm, well, there is a strain of human cervical cancer cells calls "HeLa" (after the original donor, Henrietta Lacks, who died in 1951. It is indeed a life form pretty much on its own. The existing mass of such cells now far outweighs it's original donor. It grows ferociously and without end in the lab. It couldn't live, likely, without help, but then again...
"Reporter Smith continued, "In the half-century since Henrietta Lacks' death, her ... cells ... have continually been used for research into cancer, AIDS, the effects of radiation and toxic substances, gene mapping, and countless other scientific pursuits". HeLa was used to test human sensitivity to tape, glue cosmetics, and many other products."
--Wikipedia, "HeLa".