Gynae Cancers- Cervical, Endometrial, Ovarian, Vulval Flashcards
Who does cervical cancer typically affect?
Younger women, peaking in reproductive years
What are the common types of cervical cancer?
- Squamous cell carcinoma (80%)
- Cervical adenocarcinoma (10%)
- Small cell cancer
What virus is cervical cancer typically associated with?
Human papillomavirus- persistent infection (longer than 2 years) with hiigh-risk HPV (hrHPV) causes cervical cancer
When is the HPV vaccine given and to who? What does the HPV vaccine protect against?
- Aged 12-13
- Ideally given to boys and girls before they become sexually active
- Current NHS vaccine: Gardasil, protects against HPV strains 6 & 11 (genital warts); and 16 & 18 (cervical cancer)
- The vaccine is normally given in school
- Given as 2 doses- girls have the sexond dose between 6-24 months after the first
- HPV vaccine should also be offered to men who have sex with men < age 45 to protect against anal, throat and penile cancers
- Injection site reactions are particularly common with HPV vaccines
What is the purpose of smear tests?
To screen for precancerous and cancerous changes to the cells of the cervix
What type of cancer is HPV associated with?
- Over 99.7% of cervical cancers
- HPV testing is now integral to cervical cancer screening
- Samples are first tested for HPV and only if they are positive is cytology then performed
- ~ 85% of anal cancers
- ~ 50% of vulval and vaginal cancers
- ~ 20-30% of mouth and throat cancers
What strains of HPV are responsible for cervical cancers?
Types 16 and 18
What is the treatment for HPV infection?
No treatment (most infections resolve within 2 years, some will persist)
What happens to the cervix during a HPV infection?
Infected endocervical cells may undergo changes resulting in development of koilocytes- enlarged nucleus, irregular nuclear membrane contous, the nucleus stains darker (hyperchromasia), perinuclear halo may be seen: KOILOCYTOSIS is accepted as pathognomonic (characteristic of a particular disease) of HPV infection
How does HPV cause cancer?
HPV produces two proteins E6 and E7 which inhibit tumour supressor genes p53 and pRb respectively
What causes cervical cancer?
- Acquiring HPV infection, particularly types 16 and 18
- Multiple sexual partners, early sexual activity
- Low socieoeconomic status
- Not using condoms
- Inadequate cervical screening
- Smoking
- Co-infection with other STIs such as HSV, chlamydia, gonococcal infections
- COCP for > 5 years
- FHx in a 1st degree relatives
- Increased number of full-term pregnancies
- Exposure to diethylstilbestrol (DES) during fetal development
- Used to prevent miscarriage during pregnancy between 1945 and 1970
- Women who have conditions associated with immunosuppression are at increased risk of acquiring HPV, persistent infection, precancerous lesions, and invasive cervical cancer. This includes women who
- Have HIV- more likely to develop persistent HPV infections at an earlier stage which develop into cancer sooner
- Take immunosuppressants, eg if they have had an organ transplant or IBD
What are the risks of catching HPV?
The risk of acquiring HPV infection depends on:
- The number of sexual partners
- The age at first sexual intercourse
- The likelihood that the woman’s partner or partners were infected with HPV
- Whether or not a condom is used
What are the presenting symptoms of cervical cancer?
Many women will be asymptomatic.
Consider possibility of cervical cancer in the following non-specific symptoms
- Intermenstrual bleeding
- Postcoital bleeding
- Postmenopausal bleeding
- Blood-stained vaginal discharge
- Pelvic pain/dyspareunia
After taking a history suspicious of cervical cancer, what is the next step?
- Examine the cervix with a speculum (during examination swabs can be taken to exclude infection) - assess for evidence of bleeding, discharge & ulceration
- Bimanual examination- assess for pelvic masses
- GI examination- assess for hydronephrosis, hepatomegaly, rectal bleeding, PR mass
What appearance on speculum is suggestive of cervical cancer?
- The cervix may appear inflamed or friable and bleed on contact (although the most likely cause for this will be infection with Chlamydia trachomatis)
- There may be a visible ulcerating or fungating lesion, or a foul-smelling serosanguineous vaginal discharge
- Visible tumour
Urgent cancer referral for colposcopy should be made to assess further
If a smear test returns normally can that rule out cervical cancer?
No
What is cervical interaepithelial neoplasia?
Cervical intraepithelial neoplasia (CIN) develops in the transformation zone of the cervix
A grading system for the level of dysplasia (premalignant change) in the cells of the cervix, its diagnosed at colposcopy (not with cervical screening)
- CIN I: mild dysplasia, affecting 1/3 the thickness of the epithelial layer, likely to return to normal without treatment
- CIN II: moderate dysplasia, affecting 2/3 the thickness of the epithelial layer, likely to progress to cancer if untreated
- CIN III: severe dysplasia, very likely to progress to cancer if untreated
- Cervical cancer usually develops as a progression from CIN- this occurs over 10-20 years
- Not all cases of CIN progresses to cancer, most spontaneously regress
- When the basement membrane of the epithelium is breached, invasive cervical cancer occurs- metastases to bone, bowel, liver and lungs
What is the difference between dysplasia found during colposcopy and dyskaryosis on smear results?
- Dyskaryosis: histological term, refers to the change of appearance in cells that cover the surface of the cervix
- Detected by smear test
- Earliest stage of malignancy
- Dysplasia: cytological term, describes the nuclear abnormalities/ abnormal cells within the squamous epithelium of the cervix
Who performs a smear test?
A practise nurse
What are cervical smear samples tested for?
High-risk HPV before the cells are examined, if the HPV test is negative then the person does not have HPV and the cells are not examined and the smear is considered negative
When is a cervical smear offered to females?
- 24.5 years should receive their first invitation to ensure they can be screened before they are aged 25 years
- Every 3 years for those ages 25-49
- Every 5 years for those aged 50-64
- Woman > 65 should be screened if:
- A recent cervical sytology is abnormal
- They have not had cervical screening since the age of 50 and they request one
What are the possible cytology results to the smear test?
- Inadequate
- Normal
- Borderline changes
- Low-grade dyskaryosis
- High-grade dyskaryosis (moderate)
- High-grade dyskaryosis (severe)
- Possible invasive squamous cell carcinoma
- Possible glandular neoplasia
- Infections such as BV, candidiasis, trichomoniasis can be identified
- Actinomyces-like organisms found in women with IUD (coil)- do not require treatment unless symptomatic (eg pelvic pain or abnormal bleeding)- removal of IUD if symptomatic
What are the possible management options of the smear test?
- Inadequate sample – repeat the smear after at least three months
- hrHPV negative – continue routine screening
- hrHPV positive- managed depending on cytology results:
- hrHPV positive with abnormal cytology reported as borderline dyskaryosis or worse - refer for colposcopy
-
hrHPV positive with normal cytology – repeat the HPV test after 12 months
- If the HPV testing is negative at 12 months, individuals can be safely returning to routine recall
- Individuals who remain hrHPV positive, cytology normal at 12 months, should have a repeat HPV test in a further 12 months
- Individuals who become hrHPV negative at 24 months can be safely returned to routine recall
- If hrHPV positive at 24 months- refer for colposcopy
What does a colposcopy involve? What staining methods are used and what biopsies can be taken?
Inserting a speculum and using equipment (a colposcope) to magnify the cervix. This allows the epithelial lining of the cervix to be examined in detail - stains such as acetic acid and iodine solution can be used to differentiate abnormal areas
- Acetic acid: causes abnormal cells to appear white - acetowhite/ Occurs in cells where there is an increased nuclear to cytoplasmic ratio such as CIN & cervical cancer cells
- Schiller’s iodine test: iodine solution to stain cervix cells, stains healthy cells brown and abnormal cells will not stain
- Punch biopsy or large loop excision of the transformational zone can be performed during colposcopy to get tissue sample
How is a Large Loop Excision of the Transformation Zone performed? What are some risks/ cautions to tell the patient beforehand?
Under local anaesthetic during a colposcopy with a loop diathermy to remove abnormal epithelial tissue on the cervix cauterising the tissue and stopping it from bleeding
- Bleeding/ abnormal discharge can occur for several weeks
- Avoid intercourse after procedure to reduce risk of infection
- May increase risk of pre-term labour depending on the depth of tissue removed from the cervix
When is a cone biopsy done? What are some risks of this procedure?
As a treatment for CIN and very early-stage cervical cancer under general anaesthetic
Cone shaped piece of cervix is removed using a scalpel
Sample sent to histology to assess for malignancy
Risks
- Pain
- Bleeding
- Infection
- Scar formation and cervical stenosis
- Miscarriage and preterm labour risk increases
What is the international federation of Gynaecology and Obstetrics (FIGO) staging system for cervical cancer?
Stage 1: Confined to the cervix
- A) Identified only microscopically
- B) Gross lesions, clinically identifiable
Stage 2: Invades the uterus or upper 2/3 of the vagina
- A) No parametrial involvement.
- B) Obvious parametrial involvement.
Stage 3: Invades the pelvic wall or lower 1/3 of the vagina
- A) No extension to sidewall
- B) Extension to sidewall and/or hydronephrosis
Stage 4: Invades the bladder, bowel, rectum or beyond the pelvis
- A) Involves bladder/rectum
- B) Involves distant organs
Broadly how is cervical cancer managed?
- Biopsy
- BBN: breaking bad news during a specific appointment for this
- MRI scan: plan rest of treatment
- Discussion at MDT meeting
- Decide treatment
- Cervix responds very well to radiotherapy- often a combination of external beam therapy and intracavity brachytherapy- an acceptable alternative to surgery in early-stage disease
- Stage 1b to 3: RT offered in conjunction with chemotherapy over a 5-8 course- evidence suggests hysterectomy offers no benefits in terms of survival for these stages so chemoradiation therapy is the gold standard
- Surgical approaches
- Radical hysterectomy
- Radical trachelectomy (increased risk of mid pregnancy loss & pre-term labour)
When is chemotherapy given in cervical cancer patients?
- Chemotherapy in cervical cancer is often cisplatin-based
- It can be given before treatment by surgery or radiotherapy (known as neoadjuvant chemotherapy), or after treatment (adjuvant chemotherapy)
- It is also the mainstay of treatment in the palliative setting
What is the usual treatment for cervical intraepithelial neoplasia and early-stage 1A cervical cancer?
LLETZ or cone biopsy
What is the treatment for:
Stage 1B – 2A
Stage 2B – 4A
Stage 4B cervical cancer?
Stage 1B – 2A: Radical hysterectomy and removal of local lymph nodes with chemotherapy and radiotherapy
Stage 2B – 4A: Chemotherapy and radiotherapy
Stage 4B: Management may involve a combination of surgery, radiotherapy, chemotherapy and palliative care
What is the range of 5 year survival depending on stage of cervical cancer?
What follow-up should be arranged for cervical cancer patients following treatment?
- 98% with stage 1A
- 15% with stage 4
Follow up:
- Patients should be reviewed by a gynaecologist every 4 months after treatment has been completed for the first 2 years, and every 6-12 months for the subsequent 3 years
- All follow-ups should involve a physical examination of the vagina and cervix (if they haven’t been removed)
When is pelvic exenteration used?
Advanced cervical cancer
Involves removing most or all of pelvic organs- vagina, cervix, fallopian tubes, ovaries, bladder, rectum
Significant implications on QoL
What chemotherapy agent is used in the treatment of metastatic or recurrent cervical cancer?
Bevacizumab (avastin) a monoclonal antibody
- Targets vascular endothelial growth factor A (VEGF-A) which is responsible for the development of new blood vessels
Also used for Wet age-related macular degeneration - where it is injected directly into the patients eye to stop new blood vessels forming on the retina
What is the commonest gynaecological cancer?
Endometrial cancer
- Best prognosis too!
What type of cancer are most endometiral cancers?
Adenocarcinoma
What stimulates the growth of endometrial cancer?
Oestrogen