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Since the introduction of
Colposcopy in 1924 by
Hans Hinselmann
Cytology by George Papanicolau in 1946
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Cervical cancer has become curable and detectable disease
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This is mainly due to the fact that
cervical cancer has:
Long asymptomatic pre-invasive period
Effective screening methods
Successful
modalities for treatment of pre-invasive lesions
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early detection and treatment of pre-invasive cervical
lesions have lead to significant decrease of both the
incidence and mortality of invasive cervical cancer
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Classification
Progression
Regression
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We have no dilemma of how to diagnose
CIN
Significant controversy, however, has arisen over several aspects
of the management of cervical intraepithelial neoplasia
The main questions we need to answer are:
Do all patients with CIN need therapy?
What is most appropriate therapy for CIN?
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There is no dispute about the need to
treat CIN 3, and few would argue that CIN
2 should be managed conservatively
Today it’s clear that in the spectrum of cervical pathology the line between premalignant and benign changes may be drawn between
CIN 1
CIN 2
CIN 3
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This two grades of CIN (CIN2 - 3)
are referred to as High-grade Squamous Intra-epithelial Lesions to
differentiate them from the Low-grade Lesions (CIN 1 and Hpv changes)
This division now widely used in pathology originates from Bethesda system of cytological classification that was introduced in 1988 which contains SIL terms and is divided to:
Low grade - Sil (L-SIL): Hpv changes/CIN1
High grade - Sil (H-SIL): CIN 2 and 3
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L-SIL
While near consensus exists regarding the evaluation and
management of patients with high grade lesions the appropriate
management of patients with low grade abnormalities continues to be controversial
high proportion of women affected
low risk of progression
significant regression may occur
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Most of low grade lesions reflects the
expression of Hpv infection rather than true neoplasia
Treatment
is unnecessary in many patients with L-SIL because their lesion will regress spontaneously
Bansai N et al. Anticancer Res, 2008: 28:1763-6
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Natural History of CIN
Ostör. Int J Gynecol
Pathol 1993; 12(2): 186-92
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after 10 years of follow-up …
87.8% showing mild
dysplasia became normal
2.8% progressed in cin3 and
0.4% progressed to
invasive cancer
Holowaty P. et al. J. Natl Cancer Inst, 1999; 91: 252-258
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Study enrolled more than 1000 of patients with
CIN 1 has showed that at 12 months approximately
80%
regressed to normal
16% has persistent low grade
while 4% progressed to high grade lesions
Bansai N et al. Anticancer Res, 2008: 28:1763-6
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Management of CIN1 (L-SIL)
conservative (observation)
active treatment
Close observation with cytological and possibly colposcopic follow-up,
without active treatment is the preferred management option
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Expectant management of CIN1 is not totally without
some risk
potential for a high-grade lesion to develop
during follow-up
already existing high-grade lesion that was not correctly diagnosed
loss to follow-up
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If colposcopy is unsatisfactory or large lesions or
persistent lesions are present or if the patient is
at risk for being lost to follow-up,
active treatment may be favored
In general active management of women with CIN 1 is recommended in following cases:
unsatisfactory colposcopy
large, complex lesion
persistent cin1 (>18 months)
women older than 35
noncompliance for follow-up
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Management H-SIL
Women with biopsy confirmed H-SIL (CIN2
CIN3) have significant risk of disease progression to invasive
cancer and
should be treated !!!
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Natural History of CIN
Ostör. Int J Gynecol
Pathol 1993; 12(2): 186-92
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Cumulative progression to cancer
After 2 years
0.3%
for CIN2
1.6% for CIN3
After 10 years
1.2 % for CIN2
3.9%
for CIN3
Holowaty P. et al. J. Natl Cancer Inst, 1999; 91: 252-258
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The expectant management of CIN2 and 3
with repeat
cytology and colposcopy
is not acceptable except for:
very young
patients with CIN2
pregnant patients
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Approximately 40 % of undiagnosed CIN2 will regress
over 2 years.
It should be kept in mind
that CIN2 caused by Hpv 16 may be less likely to regress than CIN2 of other Hpv types
In pregnancy CIN generally regress or remain stabile
Only a minority may appear to have progression in postpartum examination, it is reported between 3 and 7%.
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For high grade lesions in pregnancy the risk
of progression of CIN 2 and 3 in invasive
disease is relatively small but they should be reexamined every 6-8 weeks with cytology and colposcopy
For very big lesions in pregnancy large biopsy or even cone should not be delayed
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What is an effective treatment for CIN?
There
is no obviously superior conservative surgical technique for treating
and eradicating cervical intra-epithelial neoplasia
Excision is preferred because of better histological assessment
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Treatment methods
Excision
LLETZ/LEEP
Knife
Laser
Hysterectomy
Ablation
Radical diathermy
Laser
Cold coagulation
Cryocautery
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Ablative techniques are only suitable when:
the entire transformation
zone is visualized
there is no evidence of glandular
abnormality
there is no evidence of invasive disease
there is no discrepancy between cytology and colposcopy
no previous treatment
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excision is necessary in:
unsatisfactory examination
large lesions
non-correlating cytology
and colposcopy
recurrent disease
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The histology report should record:
the dimension of specimen
the status of resection margins
with regard to intraepithelial
or invasive disease
for ectocervical lesions treatment techniques should remove tissue to a depth of at least 7 mm
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What to do with involved resection margins ?
CIN extending to the resection margins
at LLETZ excision result
in a
higher incidence of recurrence
but does not justify routine repeat excision
as soon as:
the entire transformation zone is visualized
there is no evidence of invasive disease
there is no evidence of glandular abnormality
the woman are under 50 years of age
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Recurrence rate in relation to
the margin status
clear
margins – 2.9 – 12%
involved margins 22-28.9%
NEED FOR FOLLOW-UP
!!!!!
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Unless there are other compelling reasons for performing
a hysterectomy
This procedure is considered
UNEXPTABLE
As a
primary treatment for CIN 2 and 3
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The primary goal in management of pre-invasive cervical
lesions is to ensure that invasive disease is not
missed !!!