Laser Light Blocks Cancer Highway (2 of 3) (image) American Association for the Advancement of Science Share Print E-Mail Caption Targeting intralymphatic tumor cells in cancer patients. When a patient is diagnosed with cancer, the primary tumor and metastatic lymph nodes are routinely removed in surgery (blue). However, tumor cells (green) in transit in the lymphatic vessels are left behind as a putative source of local tumor relapse, such as in-transit metastasis in melanoma. Photodynamic therapy (PDT) (red) allows for the destruction of tumor-draining lymphatic vessels and the intralymphatic tumor cells. For details on the inset image please see the caption above. This image relates to an article that appeared in the Feb. 9, 2011, issue of Science Translational Medicine, published by AAAS. The study, by Dr. Tuomas Tammela at Institute for Molecular Medicine Finland, in Helsinki, Finland and colleagues, was titled, "Photodynamic Ablation of Lymphatic Vessels and Intralymphatic Cancer Cells Prevents Metastasis." Credit Image courtesy of Helena Schmidt and Toumas Tammela Usage Restrictions Please cite the owner of the image when publishing. This image may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.