Taipei Veterans General Hospital Practices Guidelines Oncology Rectal Cancer Version 2010.10.

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Presentation transcript:

Taipei Veterans General Hospital Practices Guidelines Oncology Rectal Cancer Version

ROLE OF RADIOTHERAPY IN RECTAL CANCER Pre-operative RT: –Downstaging locally advanced (stage II, III) disease. –Increased resectability (R0 resection) and local control. –Possible sphincter preservation for lower seated tumors. Post-operative RT: –To obtain better local/regional control for: Locally advanced disease after transabdominal resection. Early disease (T1-2N0) after transanal resection. Definitive treatment for locally recurrent /metastatic disease (palliation)

Retrospective review of rectal cancer with or without preoperative CCRT at Taipei VGH (N=136, year 2000 to 2004)

Local control and disease-free survival after preoperative CCRT with UFUR (N=195, year 2000 to 2009)

PRINCIPLES OF RADIATION THERAPY( 團隊共識 ) Radiation therapy fields should include the tumor or tumor bed, with a 2-5 cm margin, the presacral nodes, and the internal iliac nodes. The external iliac nodes should also be included for T4 tumors involving anterior structures. Consider inguinal nodes for tumors invading into the distal anal canal. Multiple radiation therapy fields should be used (generally a 3 or 4 field technique for 3 D CRT or 5 to 7 fields for IMRT). For postoperative patients treated by abdominoperineal resection, the perineal wound should be included within the fields. Radiation doses: –45-50 Gy in ( ) fractions to the pelvis. –For resectable cancers, after 45 Gy a tumor bed boost with a 2 cm margin of 5.4 Gy in 3 fractions could be considered for preoperative radiation and Gy in 3-5 fractions for postoperative radiation. –Small bowel dose should be limited to 45 Gy. For unresectable cancers, doses higher than 54 Gy may be required. 5-fluorouracil based chemotherapy should be delivered as continuous infusion or as a bolus daily with radiation. Oral chemotherapy with UFUR (200 mg/m2/d) + folic acid (45 mg/d) is an alternative when combined with RT.

Principles of patient simulation Before simulation, oral contrast media (barium meal) can be given for visualization of small intestine. Use of belly board with full bladder is encouraged for bowel displacement out of RT field. The lower border of the hole on the board is coincided with upper margin of fields. For tumors invading anal region, patients may have an immobilization device (e.g., vacuum bag for thighs and legs) made prior to treatment planning CT scan. Air enema should be done during simulation if possible for easier contouring of GTV. Radio-opaque markers should be put in the perineal area after APR. The treatment planning CT scan may be performed with IV contrast so that the major vessels of the pelvis are easily visualized. The treatment planning CT scan must be performed with the immobilization device (if made) and in the treatment position.

Prescription and technique of Radiation Therapy Radiation dose –Preoperative radiotherapy: 25 Gy/ 5 fractions (short-course) or 45 to 50.4 Gy/ 25 to 28 fractions (long-course),. –Postoperative radiotherapy: 50.4 Gy/ 28 fractions. Further boost can be given for positive margins and unresectable lesions. Radiation technique: –3 D conformal Radiotherapy (3 D CRT): “box” technique with AP-PA and bilateral fields. –Intensity-Modulated Radiotherapy (IMRT ) For lower seated rectal cancer invading the anus, IMRT has been shown to be useful in reducing acute toxicities by reducing the dose to small intestine, urinary bladder, external genitalia, and femoral heads. The application of IMRT to other sites (mid or higher rectum) is evolving and may be used at the discretion of treating physicians. –IMRT and Fractionation A number of ways exist to integrate IMRT, target volume dosing, and fractionation. The Simultaneous Integrated Boost (SIB) technique uses differential “dose painting” (56 to 66 Gy to gross disease; Gy to subclinical disease) for each fraction of treatment throughout the entire course of radiation.

Contouring guideline Image registration of CT and MRI/PET (if available) should be done for GTV delineation. Gross Target Volume (GTV) delineation –defined as tumor detected on physical examination or imaging studies. In postoperative cases, the GTV was defined as the preoperative gross tumor volume. Clinical Target Volume (CTV) delineation –included all potential areas at risk for microscopic tumor involvement by either direct extension or nodal spread. –Including volumes 5 mm around GTV and areas surrounding major vessels. Planning Target Volume (PTV) delineation –including a margin for patient motion and setup errors. –5 (with fixation) to 7 mm or larger margin is usually added to CTV (with belly board and no fixation)

Tumor Regression Grading (TRG) should be reported in pathology after CCRT J Clin Oncol (2005) 23:

Preoperative RT: short or long course ? Inclusion : clinical stage T3 or T4, no sphincter invasion Gy/ 28 fx +5-FU+LV vs 25 Gy/ 5 fx. Results: no difference in survival, local control, or late toxicities in two arms. Acute toxicities higher in chemoradiation group British Journal of Surgery 2006; 93: 1215–1223

Consensus for future preoperative RT protocol(I) Staging with MRI of pelvis and CT scan of chest. Two RT regimens (short vs long) for different stages. Short course RT: 5 Gy x 5 to gross tumor and surrounding mesorectal lymphadenopathy. Followed by immediate surgery. Long course RT: 1.8 Gy x 25 for pelvis, boost with 1.8 Gy x 3 for T4 primary tumor. Followed by delayed surgery (6 weeks later). New chemo regimen with long course: UFUR (200 mg/m2/d)+ mitomycin-C (6 mg/m 2 on D1).

Consensus for future preoperative RT protocol (II) Candidates for short course RT (expected R0 resection) –T2N1M0(stage IIIA) –T3N0M0(stage IIA) –T3N1M0 (stage IIIB) Candidates for long course CCRT (high risk for R1 resection) –T4 +any N (stage IIB or above) –Any T + N2 (stage IIIA or above) –Need of sphincter preservation

Acronyms RT: Radiation Therapy 3D-CRT: 3D Conformal Radiation Therapy IMRT: Intensity Modulated Radiation Therapy CCRT: Concurrent chemoradiotherapy GTV: Gross Tumor Volume CTV: Clinical Target Volume ITV: Internal Target Volume PTV: Planning Target Volume MRI: Magnetic Resonance Image PET: Positron Emission Tomography