ABSTRACT
We commonly speak of tumors as a general concept that has no specific anatomic site. Squamous cell carcinomas are tumors of squamous cells, and they arise wherever squamous cells happen to grow. The assumption is that squamous cell carcinomas all have the same general biological properties wherever they arise. The same is true for just about any tumor. A mesothelioma is a tumor that arises from the lining cells of body cavities. We might expect mesotheliomas to have the same biological properties wherever they might arise.
