This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
A somewhat dilute acid (1 part acetic acid in 3 of water) has been used as a local injection into cancerous tissue, and Dr. Broad-bent argued that since it dissolved cancer-cells outside the body, and could readily penetrate living tissues (not coagulating albumen), it might lead to local destruction and disintegration of malignant growths when brought into direct contact with them: about 30 min. were injected at a time, and some satisfactory results were reported (Medical Times, 1866- 67). I have, however, seen harm done by it, and Heine's experiments show some danger in such injections. This method of treatment has not maintained its ground, and is now seldom practised.