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THE ETIOLOGY OF CANCER.

JAMA. 1903;XL(8):523. doi:10.1001/jama.1903.02490080041012.
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Notwithstanding all the work done in cancer etiology, one of the best European authorities, Professor Lubarsch of Posen, in Germany, a man who is thoroughly familiar with the whole subject and who has evidently spared no pains to get at all the recent publications, gives it as his conclusive opinion that we are as yet not in a position to say anything definite of the cause of malignant disease. He says1 that while it is clear that all forms of malignant neoplasms resemble each other so much as to make it sure that if one is due to parasite the others are also, we have as yet no sure evidence that a parasite is the actual causative agent. On the other hand, Professor Lubarsch considers that there are groups of true neoplasms histologically different from carcinomata which yet share with them the destructive properties of giving metastases and causing

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