Peutz-Jeghers syndrome (PJS) is a rare clinical syndrome, occurring in autosomal dominant inherited forms, which is characterized by gastrointestinal, commonly small bowel, hamartomatous polyposis, mucocutaneous melanin pigmentation and predisposition to certain neoplasms11. Drs Jan Peutz and Harold Jeghers are the first to systematically describe the inherited form of PJS, who both reported patients with gastrointestinal hamartomatous polyps and mucocutaneous melanin pigmentation, which could distinguish PJS from other gastrointestinal polyposis syndromes12,13. The incidence of PJS is estimaed about 1 in 50,000 to 200,000 individuals. According to a European consensus statement14, PJS is diagnosed by the clinical criteria as the following: Two or more histologically confirmed PJS-type hamartomatous polyps; Any number of PJS-type polyps detected in one individual who has a family history of PJS in at least one close relative; Characteristic mucocutaneous pigmentation in an individual who has a family history of PJS in at least one close relative; Any number of PJS-type polyps in an individual who also has characteristic mucocutaneous pigmentation.
PJS could be defined by the mutation of STK11 (chromosome 19p13.3). STK11 encodes a serine/threonine kinase which participates in cell metabolism and growth15. In about 94% of PJS patients16,17, germline mutation of STK11 could be detected. In this case, the patient was found STK11 mutation on chromosome 19 in exon 4. Right now a variety of mutations, including deletion, insertion, and inversion mutations, have been reported in almost every coding exon, mainly in exons 1, 5, 6, and 718,19. However, the reports on genotype-phenotype correlation related to STK11 pathogenic variants are conflicting. The major source of morbidity and mortality in young patients is intestinal intussusception. Another is the increased cumulative risk of cancer. The most common are breast and colon, with the cumulative risk being more than 30%, while the general population is 12.4% and 5%, respectively1. The risk of cervical cancer in PJS patients is 10%, while the general population is < 1%. PJS-specific cancer surveillance guidelines exist, see table 11.
Table 1
Screening and Surveillance Guidelines for Peutz-Jeghers Syndrome
Site
|
Procedure
|
Age at Initial Screening(yr)
|
Interval
|
Stomach
|
Upper endoscopy
|
8, 181
|
3 yrs1
|
Small intestine
|
Capsule endoscopy or MRE2
|
8, 183
|
3 yrs
|
Large intestine
|
Colonoscopy
|
8, 181
|
3 yrs1
|
Breast
|
Breast self-examination
|
18
|
1x/mo
|
Clinical breast exam
|
|
6 mos
|
Breast MRI or digital mammography4,5,6
|
25
|
1 yr
|
Ovary, cervix,uterus
|
Transvaginal ultrasound & serum CA 125;pelvic exam w/pap smear6
|
18–20
|
1 yr
|
Pancreas
|
MRI-MRCP or endoscopic ultrasound
|
30
|
1–2 yrs
|
Testes
|
Testicular exam; ultrasound if symptomatic or abnormality on exam
|
Birth to teen yrs
|
1 yr
|
MRCP = magnetic resonance cholangiopancreatography; MRE = magnetic resonance enterography |
1. If significant polyps are present at baseline, repeat upper endoscopy/colonoscopy every three years. If no significant polyps are present at baseline, repeat at age 18 years and then every three years.
2. CT enterography may be used as an alternative. The use of MR enterography allows for simultaneous surveillance for pancreatic cancer.
3. If few or no polyps at baseline, repeat at age 18 years.
4. Digital mammography if MRI not available
5. Discuss prophylactic mastectomy.
6. Discuss prophylactic hysterectomy and oophorectomy.
In PJS patients there are two characteristic gynaecological tumours20: gastric-type adenocarcinoma of the endocervix (GAS) and ovarian sex cord tumour with annular tubules (SCTAT). Occasionally, ovarian oxyphilic Sertoli cell tumour may occur in PJS patients21. One meta-analysis of the literature reported the cumulative risk of cervical cancer in PJS patients to be around 9%, with the mean age at diagnosis in the third decade20. Adenoma malignum is commonly seen (also known as minimal deviation adenocarcinoma, MDA), which is now categorized to be a well-differentiated form of GAS in the 2014 World Health Organization(WHO) classification system. On the other hand, among the patients who are diagnosed GAS, about 11–17% have PJS22,23. While ovarian tumors, most of which are SCTAT24, occur in about 21% of PJS patients.
The histological criteria25,26 for the diagnosis of gastric-type adenocarcinoma is as follows: 1) clear or pale eosinophilic cytoplasm, 2) voluminous cytoplasm, and 3) distinct cell borders. The characteristic immune-phenotype of GAS is the presence of pyloric gland mucin, which means positive MUC6 and HIK1083 staining. Both MUC6 and HIK1083 mark pyloric gland mucin of the stomach, and are positive in most GAS and lobular endocervical glandular hyperplasia(LEGH) but not in normal endocervix or usual type endocervical adenocarcinoma(ECA)8,11. However, MUC6 is more widely available than HIK1083, as in our case, we just did MUC6 staining. As GAS is unrelated to high risk HPV(hrHPV) 1627–30, p16 staining is usually patchy or negative. The lack of estrogen receptors is seen in most GAS, as shown in our case.
The presenting sign of GAS is often mucoid or watery discharge or vaginal bleeding, and widespread involvement and advanced stage are commonly seen when the initial diagnosis is established. Ovarian metastases is not uncommon as well. The biological behavior of GAS is more aggressive compared to usual type ECA; the 5 year survival rate is less than half of that for usual type ECA31,20. As patients with GAS usually have an advanced-stage disease and widespread organ involvement, the prognosis of patients with GAS is much worse than that of patients with usual type adenocarcinoma. So in our case, we suggested and finally performed bi-oophorectomy for the patient under her consent. In the meanwhile, as according to the 2018 LACC clinical trial, we improved the surgical procedures of laparoscopic radical hysterectomy. In the surgery, a tape was used for uterus manipulation instead of cup-type uterine trans-cervical manipulator; In addition, colpotomy was done vaginally and the uterus was taken out from the vagina with the cervix wrapped in the vaginal wall cut.
Because of the high risk of malignancy in Peutz-Jeghers syndrome, a more thorough cancer screening has been proposed. Firstly, annual pelvic ultrasound and cervical screening test have been recommended for cancer screening in females older than 18 years old with Peutz-Jeghers syndrome11,20,1. Since cytologic or HPV tests are usually negative in GAS, the presence of an enlarged cervix with multiple cysts or persistent vaginal discharge or bleeding in a patient with Peutz-Jeghers syndrome worth a cervical biopsy even if the patient has no sexual life.