Radiation for Cervix Cancer

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The role of radiation in treating cervix cancer

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Radiation for Cervix Cancer

  1. 1. Robert Miller MD www.aboutcancer.com Cervix Cancer the Role of Radiation
  2. 2. Most common gynecologic cancers in women in 2012 Site Number Breast 232,340 Uterus 49,560 Ovary 22,240 Cervix 12,340 Vulva 4,700
  3. 3. Median age at diagnosis for cancer of the cervix uteri was 49 years of age (uterus 61, ovary 63, vulva 68) Lifetime risk is 0.66% or 1 in 151 of women born today will be diagnosed with cancer of the cervix Stage Distribution 5 Year Survival Local (confined site) 47% 91% Regional (into nodes) 36% 57% Distant (metastases) 12% 16%
  4. 4. •Avoidance of Human Papillomavirus Infection (abstinence, or condoms (lower risk by 60%) •HPV16/18 vaccination will lower the risk by 92% •Screening (pap smear) will lower incidence and mortality by 80% •Smoking cessation (smoking cigarettes increases the risk in HPV+ women by 2 to 3 times)
  5. 5. Importance of screening because of disease progression uterus cervix vagina Spreading cancer parametrium Into vagina Early Stage IA more advanced IA stage II
  6. 6. Work up or evaluation of a patient with cervix cancer before deciding on therapy
  7. 7. biopsy
  8. 8. Pathology Report • Invasive cancer or just dysplasia or in situ • Histology or type of cancer • Squamous cancer (69%) • Adenocarcinoma (25%) • Depth of invasion and lateral spread
  9. 9. Stages of Cervix Cancer uterus Cervix cancer
  10. 10. Stage I = confined to the cervix IA = too small to see (found only on microscope) IA1 = no deeper than 3mm or lateral than 7mm IA2 = 3 to 5mm deep and lateral up to 7mm IB = visible or bigger than a IA2 IB1 = up to 4cm IB2 = bigger than 4cm Stages of Cervix Cancer
  11. 11. Stage II = beyond the cervix IIA = onto the upper vagina IIA1 = up to 4cm IIA2 = over 4cm IIB = parametrial invasion Stages of Cervix Cancer
  12. 12. Stages of Cervix Cancer Stage IIIA = lower third vagina Stage IIIB = side wall or nodes + Stage IVA = into bladder or rectum Stage IVB = distant metastases
  13. 13. Cross section anatomy of the female pelvis bladder rectum cervix
  14. 14. Cross section anatomy of the female pelvis rectum vagina rectum
  15. 15. PET Scan = Cervix Cancer Cancer cells use more glucose or sugar and so “light up” on a PET scan which uses radioactive glucose
  16. 16. Lymph Nodes spread from the cervix
  17. 17. Frequency of lymph node metastases in cervical carcinoma.
  18. 18. Cervix cancer that has spread to para-aortic and pelvic nodes as seen on PET scan
  19. 19. Internal view (cross section) from PET
  20. 20. PET = Stage IIIB Cervix Cancer
  21. 21. Stage 5 Year Survival IB 80% IIA 63% IIB 58% III 30% IVA 16% Cervix Cancer Survival by Stage
  22. 22. Stage Survival Survival IA IA1 (97.5%) IA2 (94.8%) IB IB1 (89.1%) IB2 (75.7%) II IIA (73.4%) IIB (65.8%) III IIIA (39.7%) IIIB (41.5%) IV IVA (22%) IVB (9.3%) Cervix Cancer Survival
  23. 23. NCCN.org
  24. 24. Treatment of cervix cancer •Early stages: surgery (hysterectomy) or radiation •More advanced cases: radiation +/- chemotherapy (cisplatin) then possibly surgery
  25. 25. Early Stages: Surgery or Radiation
  26. 26. More Advanced Stages: Radiation or Surgery
  27. 27. Indications for post-operative radiation and or chemotherapy based on pathology report after surgery •Positive lymph node spread •Positive surgical margins •Invasion into the parametrium •Other high risk features: •Large primary tumor •Deep stromal invasion •Lymphovascular invasion
  28. 28. Advanced Stages: Radiation plus Chemotherapy
  29. 29. 5 Trials Demonstrating Improved Survival with Chemo-Radiation compared to Radiation Alone
  30. 30. External Beam Radiation Radioactive sourceApplicators Internal Radiation
  31. 31. CT scan is obtained at the time of simulation CT images are then imported into the treatment planning computer
  32. 32. In the simulation and treatment planning process the CT and PET scan images are used to create a “target” for the radiation and a computer plan is generated
  33. 33. During the treatment lasers are used to line up the beam and the patient receives the radiation treatment External beam radiation is usually 5 to10 minutes, Monday though Friday, 5 days a week for 5 to 30 treatments
  34. 34. Normal structures identified on CT scans that can be affected by radiation and cause side effects
  35. 35. Normal Structures Identified on MRI uterus uterus cervix cervix vagina vagina rectum rectum bladderparametrium
  36. 36. Computer generated targets for IMRT Radiation for advanced cervix cancer to treat pelvis plus para-aortic lymph nodes
  37. 37. Combine a CT scan and linear accelerator to ultimate in targeting (IGRT) and ultimate in delivery (dynamic, helical IMRT) ability to daily adjust the beam (ART or adaptive radiotherapy)
  38. 38. Radiation for cervix cancers •External beam irradiation (daily for 5 weeks) sometimes combined with chemotherapy (e.g. cisplatin) •Low dose radiation (LDR) Internal radiation (radium or cesium implants, in hospital for 2-3 days •High dose rate radiation (HDR) with Nucletron (Iridium) once a week for 3-5 weeks as an outpatient
  39. 39. Radiation Dose Techniques •External beam 45Gy (40-50Gy) plus possible sidewall boost of 10-15Gy •Brachytherapy: Point A total dose of 30-40Gy (LDR or 6Gy X 5 with HDR) to 80- 85Gy total dose
  40. 40. Internal radiation devices or brachytherapy
  41. 41. Internal radiation devices Tandem goes into the uterus Ovoids go into the corners (fornices) next to the cervix
  42. 42. Internal Radiation Devices
  43. 43. HDR = high dose rate machine that can run radiation through a tube that reaches the patient through vaginal applicators
  44. 44. HDR Cervix Applicators
  45. 45. Internal radiation devices Procedure can be performed in hospital and the patient stays over night using a Cesium isotope applicator or the procedure can be done as an outpatient with a faster technique (called high dose rate or HDR) using an Iridium isotope source (Iridium 192 with half life of 74 days)
  46. 46. Vaginal cylinder is inserted into the vagina, the radiation tube or wire stays inside the tube and doesn’t touch the patient’s skin
  47. 47. A Wire or Tube connects the vaginal or cervical applicators to the machine that holds the radioactive (Iridium) source
  48. 48. The woman lays on the radiation table and the treatment usually takes about 5 minutes and then the applicator is removed
  49. 49. Radiation Fields and Side Effects Pelvic field Para- aortic Node field
  50. 50. Side Effects of Radiation are Related to Organs that are near the Cancer
  51. 51. Side Effects of Pelvic Radiation ovary
  52. 52. Side Effects of Pelvic Radiation Radiation may hit the bowel causing some more bowel frequency, cramps, diarrhea and fatigue Radiation fields
  53. 53. Side Effects of Pelvic Radiation Radiation fields Radiation may hit the bladder and rectum causing urinary burning or frequency and rectal irritation as well as vaginal irritation Patients may benefit from Imodium, cranberry juice, skin creams and rectal ointments
  54. 54. Long Term Side Effects of Pelvic Radiation •Chronic bowel irritation (looseness or bleeding) •Chronic bladder irritation (more frequency or burning) •Sexual dysfunction (more vaginal dryness or fibrosis) •Ovarian dysfunction (normal pelvic radiation doses to the ovaries will cause menopause) •Osteitis of the bone (more brittle bones)
  55. 55. Robert Miller MD www.aboutcancer.com Cervix Cancer the Role of Radiation

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