Today cancer is the second important factor of the death in the world. Most of the cancer patients are treated with standard therapies, including surgery, radiation and/or chemotherapy. These standard therapies are most efficient on the primary tumor, but in the case of disseminated disease, they are often not effective. Treatment of disease that has disseminated from the primary tumor and metastasized to distant sites has promoted the investigation of immunotherapeutic strategies for cancer, and has been a major area of research over the last couple of decades. Chemotherapy and radiotherapy, standard therapies, are the main treatments for majority of cancer patients. Our studies demonstrate that ALA-HMME-PDT has a role in enhanced the quality of life and lengthens survival in mice infected by sarcoma 180. The reported method is hardly implemented but it possible in any clinical situation where PDT is needed. These therapies are most efficient in bearing the tumor in its first process of formation. Currently, the hot topic of discussion and research in the cancer arena is photodynamic Therapy (PDT). This type of therapy is an emerging channel of treatment that is very successful in eradicating cancer, with few side effects. The effectiveness of photodynamic therapy on the sarcoma treating process in mice by using ALA and HMME photosensitizers is investigated by this study. Many factors help us determine effectiveness of PDT including concentration of the sensitizer, absorption of light energy and accessibility of molecular oxygen in the target tissue during light irradiation, besides intrinsic sensitivity of target tissue.
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