Phase II Study of Up-front Chemotherapy and Neo-adjuvant Short-course Radiotherapy for Resectable Rectal Carcinoma (COLORE)

Title: Phase II study of up-front chemotherapy and neo-adjuvant shortcourse radiotherapy for resectable rectal carcinoma.

Short Title/Acronym: COLORE

Protocol Code: IRST154.01

Phase: 2

Study Design: Phase II, open-label, single-arm, multi-centre study.

STUDY PRODUCT,DOSE,ROUTE,REGIMEN AND DURATION OF ADMINISTRATION:

• Neoadjuvant Treatment (pre-operative chemo-radiotherapy regimen):

FOLFOX4* 2 cycles (WK1+WK3) - Tomotherapy** (WK5) - FOLFOX4* 2 cycles (WK7+WK9)

• Oxaliplatin 85 mg/m2 iv: day 1 Levofolinate 100 mg/m2 iv: day 1-2 5-fluorouracil 400 mg/m2 iv in bolus and 600 mg/m2 iv infusion over 22h: day 1-2 Every cycle will last 2 weeks (approximately 48 hours of treatment infusion and 12 days of rest).

** 25 Gy in 5 consecutive fractions, one fraction per day in 5 days on CTV (Clinical Target Volume) at the isodose of the 95% of the total dose. The treatment plan will be elaborated at the work-station dedicated to the Helicoidal Tomotherapy. The treatment could be planned also with linear accelerator with IGRT-IMRT technique or VMAT technique.

• Restaging (week 11)
• Surgery (week 12-16) with Total Mesorectal Excision (TME)
• End Of Treatment (week 16-32)
• Adjuvant therapy (The maximum interval between surgery and start of adjuvant therapy should be 8 weeks):
• FOLFOX4* 8 cycles (every 2 weeks)

Study Duration: about 5 years. Enrollment period: 36 months. Treatment period: about 8 months. Follow-up: 1 year.

OBJECTIVES

Primary objectives:

Step A: to evaluate the feasibility and safety of the chemoradiotherapy regimen.

Step B: to evaluate the proportion of patients with pathological complete remission after combined radio-chemotherapy.

Secondary objectives (of Step B):

• To evaluate the safety of the neo-adjuvant treatment
• To determine pathological down-staging
• To evaluate the rate of R0 resection
• To evaluate the sphincter saving resection rate
• To evaluate median disease free survival and overall survival
• To evaluate the correlation between biomarker, pathological response and outcome (auxiliary\\subsidiary Biological Study)

NUMBER OF SUBJECT:

· Step A: a maximum of 6 patients. 6 evaluable patients are needed to assess toxicity. If 1 toxicity resulting in discontinuation of treatment will be observed in 6 patients, the treatment can be considered safe (with a confidence > 90%).

If 2 or more toxicity resulting in discontinuation of treatment on 6 patients, the study will be stopped because not safe and another type of radiotherapy schedule must be designed.

· Step B: a total of 50 patients is required to be recruited in 2 years (including patients enrolled in Step A).

The goal is to achieve a proportion of at least 15% of patients with a complete pathological response with the new radiochemotherapeutic treatment.

STATISTICAL METHODOLOGY:

The primary analysis will be performed on the ITT (Intention-To-Treat) population, while the secondary analysis will be conducted on the PP (Per Protocol) population.

The number and percentage of treated patients undergoing grade 1 to 4 adverse events (CTC-AE, version 4.0) will be tabulated in the ITT and PP population. No statistical inference will be performed.

Step A: Patients, tumor characteristics and toxicity events observed will be described.

Step B: The proportion of patients with pathological Complete Response will be calculated. Safety profile will be analyzed. OS (Overall Survival) and DFS (Disease Free Survival) will be estimated with Kaplan-Meier method (Kaplan El, Meier P., J Am Stat Assoc 1958).

No interim analysis will be performed. The 95% confidence intervals should also be provided.

Inclusion criteria

• Patients with histologically or cytologically confirmed diagnosis of adenocarcinoma of the mid-low rectum (within 12 cm from the anal verge)
• Stage: lowT2N0, T2N+M0, T3-4 N-/+M0 (N+ = ≥ 3 nodes >0,5 cm diameter or ≥ 1 nodes > 1 cm diameter)
• Age ≥18 and ≤ 80 years
• ECOG performance status 0-1
• Patients must have normal organ and marrow function as defined below:

• - Leukocytes ≥ 3,000/mL
• - Absolute neutrophil count ≥ 1,500/mL
• - Platelets ≥ 100,000/mL
• - Total bilirubin ≤ 1.5 X ULN
• - AST (SGOT)/ALT (SGPT) ≤ 2.5 X ULN
• - Creatinine ≤ 1.5 X ULN
• Female participants of child bearing potential and male participants whose partner is of child bearing potential must be willing to ensure that they or their partner use effective contraception during the study and for 3 months thereafter
• Participant is willing and able to give informed consent for participation in the study.

Exclusion criteria

• Metastatic disease
• Patients who have had any chemotherapy or radiotherapy prior to entering the study
• Acute or sub-acute gastrointestinal occlusion
• Participation in another clinical trial, with any investigational agent within 30 days prior the study screening
• Other known malignant neoplastic diseases in the patient's medical history with a disease-free interval of less than 5 years (except for previously treated basal cell carcinoma, superficial bladder tumor and in situ carcinoma of the uterine cervix)
• History of allergic reactions attributed to compounds of similar chemical or biological composition to drugs used in the study
• Uncontrolled concomitant illness, including but not limited to: ongoing or active infections; congestive heart failure; unstable angina pectoris; cardiac arrhythmia; or psychiatric illness/social situations that would limit compliance to study requirements