Graft vs Host Disease Flashcards

1
Q

What is graft vs host disease?

A

A multiorgan disease due to foreign haematopoeitc stem cell transplants

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2
Q

What are the clinical features of ACUTE GVHD?

A

Occurs 4 - 6 weeks post HSCT

80% have skin involvement:
- morbilliform eruption
- prediliction for acral areas
- +/- pruritis
- +/- bullae
- +/- folliculotropic
- +/- purpura (in the context of thrombocytopaenia)

GIT - nausea / vomiting / diarrhoea

Liver - cholestasis > transaminitis

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3
Q

Features of Chronic GVHD

A

40% have skin invovlement
- many different phenotypes!
- Lichen planus like
- Morphea like
- Lichen sclerosus like
- Fascitits
- Pokiloderma
- Psorisiform
- KP like
- SLE like
- vitiligo
- calcinosis cutis
- alopecia
- premature graying
- joint contractures
- patterent hyperpigmentation
- nail ridging, thinning, brittleness, onycholysis
- ulcers
- xerostomia

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4
Q

What is the pathogenesis of acute GVHD?

A

Activation of host antigen presenting cells
–> donor T cells proliferate in response to these
–> destruction of target tissues (skin, gut, liver) via cytotoxic T cells, NK cells and cytokines

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5
Q

What is the pathogenesis of chronic GVHD?

A

Not well understood

Thought to be alloreactive T cells +/- B cells

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6
Q

what are the major RFs for GVHD?

A

Most important is HLA compatibility between the host and the donor

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7
Q

True or False

40% of HLA identical host and donors develop GVHD, verus 70% in they are HLA mismatched.

A

True

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8
Q

What is the histology of acute GVHD?

A

Lichenoid reaction pattern
Keratinocyte necrosis
Basal layer vaculolation
Lymphocytic infiltrates
Microvesicles and subepidermal bullae

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9
Q

What are the histological features of chronic GVHD?

A

Very variable - also lichenoid inflammation often with sclerosis

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10
Q

How is GVHD staged?

A

Skin staging:
* < 25% BSA = grade 1
* 25 - 50% BSA = grade 2
* >50% BSA = grade 3
* generalised or bullae formation = grade 4

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11
Q

What is the DDx for GVHD?

A

Acute:
- engraftement syndrome
- viral illness
- drug eruption

Chronic:
- broad… depends on the phenotype

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12
Q

What is the treatment for GVHD?

A

General measures
- moisturise
- avoid irritants
- SUN PROTECTION

Skin directed therapies:
- topical CS
- topical calcinurin inhibitors

Systemic agents: (directed by haem)
- oral CS
- Systemic immunosupressants: Ruxilitinib (JAK), MMF, AZA, Calcinurin inhibiotr

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13
Q

What is the incidence of GVHD?

A

25 - 80%

Rook

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14
Q

What are the risk factor for GVHD?

A

HLA mistmatch
Unrelated donor
Gender mismatch (esp multiparous female donor to a male recpipient)
Type of transplant (peripheral stem cells are at higher risk than BM which are higher risk than cord blood

Older age (>40)
The pre-conditioning regimen (total body irradiation)
Lack of post transplant conditioning wiht cyclophosphamide
CMV / EBV mismatch

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15
Q

Histology of aGVHD

A

Lichenoid reaction pattern
Linerar arrangement of lymphocytes along the basement membrane zone
Satelite cell necrosis consisting of apoptotic keratinocytes with tightly asssociated lymphocytes
Interface vaculoar change

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16
Q

Hist difference for aGVHD and durg reaction

A

Can be indistinguishable from lichenoid drug eruption

In early stages - scattered eosinophils are found in both
If there are a high number of eosinophils (16 per 10 high power feilds - this favours durg)

non- lichenoid pattern - favours drug

16
Q

What are the histological grades of aGVHD?

A

1: Basal cell vacuolation with or without mononuclear cell infiltration

2: Solitary epidermal cell necrosis, surrounded by mononuclear cells

3: Regional epidermal cell necorsis with bullae

4: complete dermal and epidermal seperation

17
Q

Histological changes of cGVHD?

A

Depend on the type of skin involvement

Lichenoid cGVHD:
- hyperkeratosis, hypergranulosis, acanthosis, saw tooth rete ridges, interface dermatitis and dyskeratotic keratinocytes.
- Periadnexal, perieccrine inflammation may be evident

Sclerotic lesions of GVHD:
- atrophy
- oedema
- homogenisation of collagen in the superficial dermis

Morpheform:
- thickend dermal collagen fibre bundles
- loss of adnexal structures
- no epidermal change

18
Q

What histo changes are evident?

A

Atrophy of the epidermis
Homogenisaiton of dermal collagen
Some oedema

19
Q

Typical time frame of aGVHD?

A

2 - 4 weeks post transplant (rook), 4 -6 weeks (bolognia)

20
Q

What are the cutaneous features of aGVHD?

A

Red blanching macules
- palms, soles or ears
- can appear photoagravated - affects neck, upper back and face

THen becomes more confluent with a morbilliofrm appearance

More severe cases
- Erythroderma
- Bullae
- nikolsky positive epidermal skin loss

Oral
- xerostomia
- redness
- ulceration

Pruritis ++

Rook

21
Q

Complications of aGVHD

A

Weight Loss
Dehyrdration
Electorlyte disturbance

Secondary infection

Thermodysregulation, Electorlyte disturbance (and all other complications of erythroderma)

Rook

21
Q

DDx for aGVHD?

A

Cutanoues durg reaction
- morbilliform
- lichenoid
- SJS / TEN

Chemotherapy induced mucosisit

Engraftment syndrome

Viral illness

Rook

22
Q

Prognosis of aGVHD?

A

Mortalitiy depends of grade:

1: 27%
2: 43%
3: 68%
4: 92%

23
Q

Investigations for aGVHD?

A

4 mm skin biopsy of lesional skin
- for histology
- for DIF (to exclude ddx)

FBC
UEC
LFTs

Blood cultures + Septic screen if fevers / unwell

24
Q

aGVHD management

A

Topical
- Emolliants
- TCS
- topical calcinurin inhibiotrs

Adjuncts
- antihistamines

Systemic:
- optimisation of prophylactic GVHD therapy (guided by haematology)
- for grade 2 - 4: oral corticosteroids or IV methyl prednisolone

Steroid refractory (no response in 7 days)
- ECP
- MMF
- mTOR inhibitors
- anti IL -22

25
Q

What are the cutaneous featuers of cGVHD?

A

Mucous membranes:
- Oral: Xerostomia, ulceration, Wickam striae, dental caries
- genital: LS, ulceration, dryness, itch, stenosis, fusion
- Ocular: dryness, keratoconjunctiva sicca

Pruritis
Xerosis
Skin tightening / thickening
LP like
SLE like
Morphea like
Sceledermoid like
Dyspigmentation and vitiligo
Pokilodermatous
Esosinic fascitis like
ecxematous
papulosquamous
PRP like

Nail:
- dystrohpy
- pterygium
- anonychia

Hair:
- alopecia (scarring or non-scarring)

26
Q

What are the key extracutanoues features of GVHD?

A

Liver
GIT
Lung
MSK
Neuro

27
Q

Chronic GVHD Managment

A

Treatment ladder, progress through the ladder for more sever disease

Emolliants / lubricants
TCS

UVA1 / PUVA

Oral corticosteroids - 1mg/kg/day

Ciclosporin

Ruxolitinib

Imatinib