Inclusion Criteria:

1. Patients must have a histologically proven diagnosis of colorectal cancer.

2. Have clinical stage I, II, or III disease.

3. Expected survival must be greater than twelve (12) months.

4. A Karnofsky Performance Status (KPS) must be 70 or greater (Appendix I).

5. Patients must be >21 years of age.

6. No prior therapy.

7. Female patients must not be lactating and must be surgically sterile (via
hysterectomy or bilateral tubal ligation), postmenopausal, or using acceptable
methods of contraception if they are of child bearing potential. Female patients of
childbearing potential must also have a negative serum pregnancy test.

8. Patients must be able to understand and sign an informed consent form, which must
comply with U.S. regulations (U.S. 21 CFR 50) and ICH guidelines.

9. Eligible patients must have adequate initial hematologic and coagulation parameters,
hemoglobin ≥ 11g/dl, platelet count >50,000, Protime and Prothrombin Time ≤ 1.5 x
normal.

10. Eligible patients must have adequate bone marrow, liver and renal function: ANC >
1500/μL, Platelets >100,000 x μL, total bilirubin < the upper limit of normal (ULN),
and creatinine clearance (CrCl) > 45 mL/min

Exclusion Criteria:

1. Any co-morbidity that precludes primary surgical resection of the colorectal tumor.

2. Any significant general organ system compromise including:

- Liver function, transaminases ≥ 2 x,

- Renal function, Cr ≥ 1.5 x upper limit of normal

- Pulmonary function, room air O2 saturation <90%

- Cardiovascular function, Patients with significant (Class III or IV)
cardiovascular disease according to the New York Heart Association's functional
criteria (Appendix II)

- Gastrointestinal function, i.e. active inflammatory bowel disease or active
peptic ulcer disease.

3. Any contraindication to repeat colonoscopy, such as idiosyncratic reactivity to
conscious sedation medications.

4. Prior treatment for the diagnosis of colorectal cancer, including surgical resection.

5. Stage IV colorectal cancer, i.e. the clinical presence of metastases

6. Prior malignant diagnosis except for the basal cell epithelioma of the skin.

7. Persistent fever greater than 38 C.

8. Mineral overload syndromes for Lead, Zinc, Copper or Iron.

9. Use of any agent that modulates 5-ALA metabolism and porphyrin synthesis, e.g. St.
John's Wort.

10. Required use of corticosteroids or immune suppression for any reason including an
organ allograft or HIV infection

11. Patients with any acute or chronic illness including cardiovascular disease (e.g.
history of atrial fibrillation or ventricular arrhythmias) or history of myocardial
infarction, autoimmune state, or any psychiatric illness that in the opinion of the
Investigators would compromise treatment.

12. Use of investigational drugs within 30 days of execution of the informed consent
form.