Tumour and HEalthy Tissues DOse-response and Radiosensitivity Assay

Evaluation of Individual Radiosensitivity of Cancer Patients to be Treated by Radiotherapy or Radiochemotherapy Per-operative

THEODORA is a prospective pilot clinical trial aiming at first to evaluate and validate the predictive value of the A & MS bioassays on tumor control by radiotherapy.

For that purpose, this project is composed of 3 stages:

• A Calibration stage that will allow to evaluate the correlation between the clinical tumor response parameters (i.e. TV/AP features) and the radiobiological parameters issued from the A/MS bioassays in order to develop a mathematic model defining the UTCR parameter
• A Validation stage in order to assess the validity of A/MS bioassays towards clinical tumour response parameters (i.e. both TV/AP features and UTCR).
• A Precision stage will be performed either to improve the precision of the predictive performance of the A and MS bioassays or to establish a new mathematical model describing the correlation between clinical and radiobiological parameters. The objective of this precision stage will depend of the results of the calibration stage (see below).

This prospective clinical study will be conducted in a population of patients with different tumor types in order to explore a large range of tumor radiosensitivity including sarcomas, rectal carcinoma and esophagus tumor.

Inclusion Criteria:

I1. Patients (male or female) ≥ 18 years of age. I2. Adult patients with a suspected, non-treated, non-metastatic retroperitoneal or limb soft tissue sarcoma, esophagus cancer or rectum cancer to be treated by pre-operative radiotherapy or radio-chemotherapy I3. At least one measurable lesion as per RECIST 1.1 I4. Documented negative serology tests (HVB, HIV, HVC) I5. PS ECOG 0 to 1 I6. Patient able and willing to provide informed consent. I7. Ability to understand and willingness for follow-up visits. I8. Covered by a medical insurance.

Exclusion Criteria:

E1. Contra-indication to radiotherapy E2. Contra-indication to skin biopsy