Radiation Oncology Basics - Dalhousie University · 2019-05-01 · Radiobiology Summary • 4 R’s...
Transcript of Radiation Oncology Basics - Dalhousie University · 2019-05-01 · Radiobiology Summary • 4 R’s...
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Radiation
Oncology
Basics
Murali (Mal) Rajaraman, MDDepartment of Radiation Oncology
Nova Scotia Health Authority
Dalhousie UniversityQEII HSC, VG Site, Dixon Bldg.
Jan 23, 2019
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Conflict of Interest Disclosure
• None
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Learning Outcomes
• Be aware of the basic principles radiation therapy
• Describe, in basic terms, the process for planning and
delivering radiation therapy
• Outline the role of radiation in treating common
malignancies for cure and palliation
• Describe how radiation therapy is used pain control in
cancer
• Describe the common side effects of radiation therapy
and approach to their management
• Be familiar with the use of radiation therapy in the
treatment of oncologic emergencies
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Radiation Therapy Overview
At least 50% of people with cancer may benefit from a course of radiotherapy (RT)
Treatment goals:
1. curative (~50%)
2. palliative» Lower, more concentrated dose-fractionation
schedules; improve QOL while minimizing side-effects
3. maximize local control
4. prolong survival
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Radiation Therapy Overview
RT can be the primary modality or used in combination with other cancer therapies
Radiation Oncologist
Surgical Oncologist
Medical oncologist
Specific management is evidence-based and individualized, accounting for various factors… …disease site and stage …patient factors
local & regional
systemic
}
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Principles of Radiation Therapy:
What Radiation is Used?
Radio TV Microwave Infrared Visible UV Medical X-Rays
Waves Light Gamma Rays
Thermal Optical Broken Bonds
(Damages DNA)
Non-Ionizing Ionizing
The Electromagnetic Spectrum
100 KV…6 MV…..18MV
RT Beam Energies
Tanning Booth
Increasing Frequency, Decreasing Wavelength
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What Radiation is Used?
Radiation
Beam
Energy
Effective Treatment Depth
Clinical Examples
100-250KV Millimeters
Basal/
Squamous cell skin cancer
4-10 MV
Few centimeters
Head / Neck cancer; lung cancer
18-25 MV
Several centimeters
Prostate / Cervical cancer
Beam energy choice is based on location/depth of cancer
and NOT on intensity of treatment
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What Radiation is Used?
Radiation
Beam
Energy
Effective Treatment Depth
Clinical Examples
100-250KV Millimeters
Basal/
Squamous cell skin cancer
4-10 MV
Few centimeters
Head / Neck cancer; lung cancer
18-25 MV
Several centimeters
Prostate / Cervical cancer
6 MV
Beam energy choice is based on location/depth of cancer
and NOT on intensity of treatment
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How is the Radiation Delivered?
Externally = Teletherapy = External Beam RT- radiation is at a distance to cancer)
- modern Linear Accelerators (LINAC)
produce Gamma rays from electricity
(Old=Cobalt machines, Co-60)
Internally = Brachytherapy(radiation is placed close to cancer)
Systemic (Unsealed) Radioisotope Therapy(radiation given in pill or IV liquid form)
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• 131I thyroid remnant ablation, after near-total thyroidectomy for differentiated thyroid cancer (DTC) =Pap + Foll (not Med / Anapl)
• 50 – 80% of tumors will concentrate iodine
• t1/2 = 8 days ; very low energy emitter of gamma rays and electrons; damages cell and nearby cells; little escapes the body; kept in isolation
• given orally as inpatient (doses > 1 GBq or 30mCi)
• Prep: • increase TSH with thyrotropin alfa (Thyrogen) injections or THW (off T4 x 4
wks)
• Low Iodine Diet x 2 wks
• Can reduce recurrence rates, improve survival, allow follow up whole body I – 131 scan (WBS) and sensitive thyroglobulin measurements, and palliate metastatic DTC
• Comprehensive reference: 2015 American Thyroid Association Mx Guidelines for Thyroid Nodules and Differentiated Thyroid Cancer
http://www.thyroid.org/professionals/ata-professional-guidelines/
Ingested Radiopharmaceuticals
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How is the Radiation Delivered?
Teletherapy = External Beam RT = EBRT
is most
common
form
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EBRT Techniques
External beam RT machines (linear
accelerators) produce various beam energies
(4 MV, 6MV, 18MV)
Beam energy choice is based on
location/depth of cancer and NOT on intensity
of treatment
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EBRT Techniques
Conventional External Beam Radiotherapy
Stereotactic Radiation Therapy/ Radiosurgery
Intensity-modulated Radiotherapy (IMRT)
Image-guided Radiotherapy (IGRT)
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Radiation Dose
Describes treatment intensity
Unit of RT dose: Gray (Gy)
Old unit “rad” is replaced by “centigray”
(1 centigray = 1 rad)
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Dose Fractionation
Division of total prescribed dose allows
cancer cell killing while minimizing normal cell
damage (facilitates recovery of normal tissue)
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Dose FractionationStandard Fractionation RT
(70 Gy/35f/7wks; 2 Gy/d, M-F)
week: 1 2 3 4 5 6 7
IIIII IIIII IIIII IIIII IIIII IIIII IIIII
Microscopic 50 Gy/ 25f Gross 70 Gy/35f
Accelerated Fractionation RT
eg. DAHANCA (Danish) protocol
(70 Gy/35f/6wks; 2 Gy/d, M-Th
+ 2Gy BID on F)
week: 1 2 3 4 5 6
IIIII IIIII IIIII IIIII IIIII IIIII
IIIII IIIII IIIII IIIII IIIII IIIII
Microscopic 50 Gy/ 25f Gross 70 Gy/ 35f
T2 N2b M0 R tonsil ca
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How does the Radiation Work?
DNA is the critical target for radiation
RT produces breaks in the DNA through
ionization and the production of free radicals,
enhanced by the presence of oxygen
The damage caused by radiation can cause
cell death or loss of ability to repeatedly
reproduce
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How does the Radiation Work?
Irradiated cancer cells may die immediately,
within hours, days or weeks
Therefore, maximal response will usually not
be immediate
The full effects of RT depend not only on total
dose but also on dose per fraction, total
treatment time, and delivery schedule
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RT Principles Radiobiology
• 4 R’s of Radiobiology
Repair
Repopulation
Reoxygenation
Redistribution
• Fractionation:
- division of total prescribed dose and given in a series of fractions separated in time
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Therapeutic Ratio
TR =
Normal Tissue
Complication Probability
Tumour Control Probability
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RT Principles:
Radiobiology - R’s that spare normal tissues
• Repair– ..of radiation damage
• Types of damage:
– Base pair damage
– DNA-protein crosslinks
– Single DNA strand breaks
– Double DNA strand breaks
• 200 – 300 genes responsible for DNA repair
• The degree of repair is intrinsic to the tumor type and/or normal tissue type
– Occurs more in normal tissues than in tumor so Fractionationallows normal tissues to recover preferentially
• Repopulation– Allows normal tissues to
recover (skin, mucosa)
– if RT is too prolonged by Fractionation, tumor can divide also
– “accelerated repopulation” : occurs when treatment with a cytotoxic agent causes an increase in tumor cell division rates
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RT Principles:
Radiobiology- R’s that enhance tumour cell kill
• Reoxygenation
– Hypoxia induces increased radiation resistance
– If RT is given Fractionated, then hypoxic cells can reoxygenate
and their presence does not significantly affect tumour response
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RT Principles:
Radiobiology- R’s that enhance tumour cell kill
• Redistribution
• Most radio-sensitive is G2- M phase,
• Most radio-resistant is late S
• If RT is given Fractionated, then radio-resistant late S cells can redistribute into other more radio-sensitive with less affect tumour response
Cell Cycle
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RT Principles:
Radiobiology Summary• 4 R’s of Radiobiology
Reoxygenation
Redistribution
Repair
Repopulation
• Fractionation:
- division of total prescribed dose and given in a series of fractions separated in time
- allows increased cancer cell kill (reoxygenation & redistribution) while minimizing normal cell damage (repair and repopulation)
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Planning & Delivery of Radiation
Therapy
Referral
Radiation Oncologist Consultation
Pre-radiation Assessment
Simulation
Treatment Planning
Calculation and Data Entry
Radiation Treatment Delivery
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Planning & Delivery of Radiation
TherapyPrioritization Guidelines
Emergent: Treat within 48 hours
Urgent: Treat within 7 days
Intermediate: Treat within 14 days
Standard: Treat within 21 days
Other: Individualized target dates
~ 2 weeks
~ 2 weeks
~2-4 weeks
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Pre-radiation Assessments
Staging investigations
Pulmonary function tests
Dental consultation
Nutritional consultation
Cardiology Pacemaker evaluation
Cancer Site Team case discussion
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Simulation
Immobilization devices
With the use of a radiotherapy (dedicated CT
scan) simulator, the patient is placed in the
treatment position and the areas of interest
are imaged
Reference ‘markings’ or tattoos are placed on
the skin
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Treatment Planning, Calculation
& Data EntryTarget volumes and
normal tissues carefully
outlined
Beam energies &
arrangements
determined
Dose calculations and data entry
Plan is finalized and approved for treatment
Dia
gn
ostic
CT Pla
nn
ing
CT
MR
I
PE
T
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Radiation Treatment Delivery
IMRT for head and neck cancer
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Stereotactic radiosurgery (SRS) for a brain met
Radiation Treatment Delivery
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Radiation Treatment Delivery
New technology: multileaf collimator(MLC) which defined conformal beam aperture
Custom-made lead-alloy (cerrobend) shielding defined beam shapes
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IMRT= Intensity Modulated RadiationTherapy
VMAT=Volume Modulated Arc Therapy
33Beam Intensity patterns modified using MLC movement while beam is On
https://www.youtube.com/watch?v=GYqNcuXN-hQ
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Radiation Treatment Delivery
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Common Treatment Protocols for
CureLUNG Ca
Inoperable
C + R 6000 cGy / 30f / 6 weeks
BREAST Ca S +/- C, then R 5000 cGy / 25f /5 weeks
PROSTATE Ca S or
R+/- Hormones
7200 cGy / 36f / 7.5 weeks
COLORECTAL Ca S, then C + R 5400 cGy / 28f / 5.5 weeks
HEAD & NECK Ca Early: S or R
Adv: S and C + R or C + R
7000 cGy / 35f / 7 weeks
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Common Treatment Protocols
for Palliation
800 cGy / 1f / single
2000 cGy / 5f / 1 week
3000 cGy / 10f / 2 weeks
7000 cGy / 35f / 6-7 weeks
2400cGy/3f / Day 0,7, 21
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Use of Radiation Therapy for
Pain Control• Palliation of bone mets
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Use of Radiation Therapy for
Pain Control• Palliation of local tumour progression,
neuropathy
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Side Effects of RT
Side effects are the result of damage to
normal healthy tissue
Depend on the site of the body being treated
– usually localized
Potential side effects are explained to patient
and family prior to initiating treatment
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Side Effects of RT
Site-specific
Radiosensitivity of the tissue
Dose of radiation and fractionation schedule
Size / volume of the treatment field
Other: comorbidities, age, nutrional status, combination with surgery / chemotherapy
Retreatment to same area has higher risk of permanent side effects and may be less effective
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Side Effects of RT
Normal Tissue Tolerance
Low Moderate High
Testes
Ovary
Eye (lens)
Kidney
Lung
Liver
Skin
Bone Marrow
Spinal Cord
Bowel
Mucosa
Adult Brain
Bone
Cartilage
Muscle
Rectum
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Acute Side Effects
Occur during and up to six weeks following
radiation therapy
Generally resolve within 4-6 weeks after
treatment completes
Due to the effect of radiation on rapidly
dividing cells in the treatment field
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Late Side Effects
Occur months to years following radiation
therapy
Tend to be permanent
Usually the result of damage to
microcirculation
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Common Acute Side Effects and
Management
Fatigue
Nausea
Skin reactions/alopecia
Acute mucosal reactions
Xerostomia
Diarrhea
Pneumonitis
L’Hermittes Syndrome
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Fatigue Management
Validation & education of patient and family
Activity planning and energy conservation
Try to maintain regular sleep hours
Reduce stress and anxiety (counseling & support)
Good nutrition and fluid intake
Treat underlying cause, if identified
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Radiation-Related Nausea
Management
Pre-treatment anti-emetics
Zofran, Maxeran, Stemetil, Gravol
as needed
Dexemethasone may be helpful
Dietitian consultation
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Skin Reaction
Most common side effect of external beam radiation
therapy
Begins ~ 2 weeks into treatment
Peaks ~ 2 weeks after treatment
Resolves over 3-6 weeks after radiation therapy has
finished
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Acute Skin Reactions
Radiation skin reaction: erythema and early dry desquamation
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Acute Skin Reactions:
General AdviceBathe or shower using luke warm water and mild soap
Use an electric razor
Avoid commercial creams in treatment area
Sun protection of the area during and after treatment
No sunscreen during and until reaction has resolved
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Acute Skin Reactions:
Management
Acute Skin Reactions Management
Little to no changes Dry dusting of cornstarch or cornstarch baby powder
Slight erythema
Mild dryness/itch
Alcohol-free Aloe Vera
Dry peel/ increased itchiness
1% Hydrocortisone cream
Moist peel/ tenderness Flamazine or Tegagel
Saline soaks/sitz baths
Tylenol
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Acute Mucosal Reactions
Radiation mucositis: early erythema of soft palate
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Acute Mucosal Reactions:
General Advice Good oral hygiene
Baking soda /salt water rinses
Nutritional/dietary counseling
Avoid alcohol/smoking
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Acute Mucosal Reactions:
ManagementModerate to severe oral mucositis/ Esophagitis
Oncology Mouthwash (Maalox® / Lidocaine)
(swish and swallow before meals)
Anelgesics (Codeine elixir)
Admission for IV/parenteral nutrition, G-tube
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Acute Mucosal Reactions:
Management
Candida infection
Nystatin 500,000 units po QID for 7 days
swish and swallow
Canesten lozenges
(dissolved QID)
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Xerostomia: Management
partial, permanent…some recovery even 1-2 years later
Regular dental assessments and cleaning
Good oral hygiene
Artificial saliva products trial
Oral pilocarpine trial may stimulate residual gland function
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Diarrhea: Managaement
Small frequent meals
Increase fluid intake
Low fibre/fat diet
Avoid gas causing food and caffeine
Imodium
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Side Effects in Special Tissues:
LungPneumonitis Management:
- 6-12 weeks post RT to chest; dry cough, SOBOE, pleuritic pain; early in-field changes on CXR
Prednisone 30-40 mgs daily-tapered over 6-8 weeks
Oxygen & Inhalers prn
Most resolve***Can be Life Threatening***
Re-refer to Rad. Oncologist if suspected
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Side Effects in Special Tissues:
Spinal CordL’Hermitte’s Syndrome Management:
-Transient demyelination, 6-12 months post-RT to
spine, shock-like in arms / legs with neck flexion, full
recovery expected
Non-steroidal anti-inflammatories
Avoid neck flexion
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Emergency Situations in
Radiation Oncology
Spinal Cord Compression (SCC)
Superior Vena Cava Obstruction (SVCO)
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Spinal Cord Compression (SCC)
Occurs when a tumour
compresses or invades the
spinal cord
Most commonly due to
metastases to vertebral body (C)
Timely diagnosis and
intervention has critical impact
on prognosis
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SCC Symptoms
• Back Pain (+ cancer patient = r/o early SCC)
• Leg weakness
• Numbness
• Stool and/or urinary incontinence (late)
• Irreversible Paraplegia (very late)
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SCC Signs
• Bilateral leg weakness
• Sensory dermatomal level
• Hyperactive or absent reflexes
• Poor anal sphincter tone
T4: nipple T10: umbilicus
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63
12
7
AP spine Xray Loss of height of VB
“winking owl sign” = disappearance of pedicle on AP view
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SCC Investigations
Most important:
MRI entire spine- noninvasive
- multiple levels
visualized
- neurological details
T8
T9
T10Metastatic lung ca to spine causing spinal cord compression at T9 vertebral body
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SCC Management
Timely diagnosis
and intervention
has critical impact
on outcomes
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SCC Management
• Surgery (<24 hrs)
LaminectomyVBR
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SCC Management
• Radiotherapy(<24 hrs)
800 cGy / 1 #
(single)
2000 cGy / 5 #
( 1 week)
3000 cGy / 10 #
(2 weeks)
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SCC Outcomes
Prognosis for SCC treated with RT*(Byrne et al. NEJM. 1992.)
Status at Start of RT % Ambulatory post-RT
ambulatory > 80%
paraparetic ~ 50%
paraplegic < 10%
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Spinal Cord Compression (SCC)
• Any person with a cancer diagnosis complaining of back
pain – must rule out SCC
• Diagnosis should be confirmed with MRI
• Begin steroids & immediately contact radiation
oncologist / neurosurgeon to discuss
• Steroids (dexamethasone 10 mg then 4 mg po/iv qid)
• Management with surgery and/or radiation therapy must
be instituted within hours of onset of the neurological
symptoms for any chance of recovery
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Patient Education for SCC
At risk patients should be taught to report any back pain,
numbness/tingling in arms or legs, or muscle weakness
Patient education
handout:
“When Cancer Spreads to
Bone: Spinal Cord
Compression” available
http://www.nshealth.ca/sites/nshealth.ca/files/patientinformation/nsccp0047.pdf
Search “Pamphlets Listing” …and filter under ‘cancer’
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Superior Vena Cava Obstruction
(SVCO)
Obstruction of blood flow through the superior
vena cava
Caused by:
- Tumour
- Enlarged lymph nodes
- Thrombosis
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• Any person with a
malignancy in the chest
(usually lung cancer) with:
– Dyspnea
– Swelling of face and upper
torso
– Venous distension in chest
and neck
Superior Vena Cava Obstruction
(SVCO)
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SVCO Symptoms & Signs
Dyspnea
Swelling of the face and upper torso
Distention of veins in neck, chest, upper back
and arms
Nonproductive cough
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SVCO Symptoms & Signs
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SVCO Investigations
• CT chest with contrast
SVCO
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SVCO Management
• If suspected, contact radiation or medical oncologist to discuss immediately
• Diagnosis confirmed clinically
• Supportive measures– Bed rest, with head elevated
– Oxygen
– Remove restrictive clothing
– Avoid IV placement in affected arms
• SVCO requires urgent treatment– Steroids (dexamethasone 10 mg then 4 mg po/iv qid)
– RT or Chemo after histology obtained
– stent
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77
SVC Stent
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SVCO Outcome
Prognosis depends on the underlying disease
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Radiation Oncology Basics
Key Messages• RT: noninvasive, effective cancer therapy used alone
or with surgery & chemotherapy with goals for cure and palliation (local control, improve survival)
• Process for RT planning and delivery: a team of health care professionals and can require days to weeks
• Cancer pain is effectively relieved by RT with few side effects
• Common acute side-effects of RT mostly resolve and can be managed to complete the RT as planned
• Emergencies such as SCC and SVCO need to be recognized, referred, and managed early
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Radiation Oncology Basics