Cancer Penis and Scrotum


TPrimary tumor

TX Primary tumor cannot be assessed

TO No evidence of primary tumor

Tis Carcinoma in situ

Ta Noninvasive verrucous carcinoma

TI Tumor invades subepithelial connective tissue

T1a Tumour invades subepithelial connective tissue without lymphovascular invasion and is not poorly differentiated or undifferentiated (T1G1-2)

T1b Tumour invades subepithelial connective tissue without with lymphovascular invasion or is poorly differentiated or undifferentiated (T1G3-4)

T2 Tumor invades corpus spongiosum or cavernosum

T3 Tumor invades urethra or prostate

T4 Tumor invades other adjacent structures

NRegional lymph nodes

NX Regional lymph nodes cannot be assessed

NO No regional lymph-node metastasis

NI Metastasis in a single superficial inguinal lymph node

N2 Metastasis in multiple or bilateral superficial inguinal lymph nodes

N3 Metastasis in deep inguinal or pelvic lymph node(s), unilateral or bilateral

MDistant metastasis

MX Distant metastasis cannot be assessed

MO No distant metastasis

MI Distant metastasis


















Stage grouping

Stage O Tis NO MO/Ta NO MO

Stage I TI NO MO

Stage II TI NI MO/T2 NO, NI MO

Stage III TI N2 MO/T2 N2 MO/T3 NO, NI, N2 MO

Stage IV T4 Any N MO/Any T N3 MO/Any T Any N MI





Prognostic Factors

Factors predisposing to local recurrence after treatment are increasing T-stage and increased grade of differentiation [22]. The most important prognostic factor for survival is presence or absence of lymph node metastasis [2325].


Clinical Features

The most prominent clinical feature is the presence of the primary tumor. Regional metastasis may present as occult metastases or overt lymph node involvement [3, 16, 17, 23].


Primary Tumor

Present lesion commonly originates in the sulcus of the corona glandis. The lesion is clearly visible and palpable after retracting the foreskin. The lesion can be papillary, solid or ulcerating. Depending on the stage at diagnosis, the lesion is superficial or infiltrating into all the tissue layers of the penis. Patients with non-retractile foreskin (phimosis) often present with a foul-smelling discharge as a first sign. The tumor can usually be palpated under the foreskin [3, 16, 17].


Features Regional Metastases

Enlarged inguinal lymph nodes are the main clinical feature. Lymph node metastases could be unilateral or bilateral. Signs of inflammation may dominate the clinical picture (hyperemia, pain, edema). Further spread is only manifested by secondary symptoms like lymphedema, because of proximal lymphatic obstruction, flank pain because of ureteric obstruction, bone pain, because of bone metastases or the signs of hypercalciemia [3, 16].



Diagnosis and Staging



Biopsy and Imaging


Biopsy Primary Tumor

A biopsy (incisional or excisional) is strongly recommended to establish a correct tissue diagnosis. The biopsy should be taken on the border of normal and abnormal tissue and should encompass the full thickness of the tumor enabling the pathologist to give an impression of the depth of infiltration [3, 16, 17, 26].


Biopsy Regional Metastasis

Presence of lymph node metastasis can be proven by fine needle aspiration (FNA) biopsy, preferably under ultrasound guidance. Removal of a single lymph node is not recommended, unless proof of lymph node involvement cannot be obtained in suspicious cases by repeated fine needle aspiration biopsies [27].


Staging


Primary Tumor

Physical examination is usually sufficient. Details of the lesion including exact location, diameter and involvement of the skin, subcutaneous tissue, cavernous tissue, urethra and neighboring tissues are recorded. In case of doubt about the proximal extent ultrasound and MRI can be helpful [2830].


Staging of the Regional Lymph Nodes

Occult metastases cannot be found by palpation. Ultrasound combined with fine needle aspiration biopsy may be of helpful [31]. In a small series of 7 patients, promising results have been published on the use of lymphotropic nanoparticle (ferumoxtran- dextran-coated iron oxide) enhanced MRI [32]. More invasive is the use of so called dynamic sentinel node biopsy (see later). In patients with overt metastases one should record the size, number and fixation to the skin or underlying structures like femoral artery/ vein or femoral nerve.


Management Primary Tumor and Management Regional Lymph Nodes



Management Primary Tumor


Surgical Management Primary Tumor

Penis preserving therapies can be attempted if removal with a minimal margin of 2–3 mm normal tissue can be achieved. This can be done by simple excisional surgery or in combination with the use of the laser [22, 33]. Involvement of the epithelium of the glans can be managed by partial or total removal of the epithelium with split skin grafting [34]. If penis preservation is not possible, a partial amputation or total amputation is required. It is possible to void in standing position after partial penile amputation. After total amputation the urethral opening is positioned in the perineum, behind the scrotum (perineal urethral stoma, perineo-urethrostomy).


Non Surgical Management Primary Tumor

Penile preservation can also be achieved by external beam radiation therapy or brachytherapy. These modalities can be chosen as an alternative to partial amputation [22, 35, 36].


Management R+egional Lymph Nodes



Management Clinically Node Negative Patients

This is a controversial issue with two groups of proponents. One group advocates inguinal lymph node dissection in all but the smallest tumors and the other group advocates a wait and see policy in all patients except in those with unfavorable prognostic characteristics. There is uniform consensus that patients presenting with stage Tcis and well differentiated T1-tumors could be treated expectantly [23, 37, 38]. Based on biopsy protocols of melanoma and breast cancers the so called dynamic sentinel node biopsy was developed for all other categories [39]. A lymph node dissection is done only in sentinel node positive patients. Results show acceptable false negative rates and excellent survival figures compared to a cohort of patients managed conservatively [17, 40].


Management of Clinically Node Positive Patients

Treatment usually consists of a straightforward inguinal lymph node dissection. This should be preceded by FNA in order to prove metastatic involvement of the lymph node. Depending on the number of tumor positive nodes, extracapsular growth and the location of tumor positive nodes, a complementary iliac lymph node dissection is mandatory. Patients with fixed nodes and or presenting with retroperitoneal nodes should undergo pre-operative treatment with combination chemotherapy or radiation therapy. After response evaluation subsequent surgery should be scheduled in patients with clinical response. Because of the rarity of this disease this should be done preferably within the framework of a clinical study [27, 41, 42].


Treatment Results



Results of Primary Tumor Treatment

Penis preserving treatment is safe, but meticulous follow up or self-examination is of utmost importance as the local recurrence rate varies from 19 to 37 % irrespective of type of treatment. As a local recurrence can be the source of further spread this should be treated at the earliest possible moment. Local recurrences after partial or total amputation is rare. The most common complication is stenosis of the neo-urethra (5–10 %) [22, 43].

Standing urination and normal erection are maintained in penis preserving treatments and often after partial amputation, dependent on the size of the stump. After total amputation standing voiding is impossible. Of note is the fact that patients can have a normal ejaculation after total penile amputation [44, 45].

Patients with a single metastasis in the regional lymph nodes have a 5 year disease specific survival of 70 %, in contrast to 50 % with bilateral lymph node invasion. This decreases further to 29 % in patients with microscopic pelvic lymph node invasion. Patients presenting with fixed inguinal masses or large pelvic lymph nodes do poorly, with hardly any long term survivors [41, 46, 47].



Tumours of the Scrotum



Epidemiology and Aetiology



Incidence

Scrotal tumors are exceedingly rare with an age adjusted incidence of 0.2–0.3/100,000 population [48].


Etiology

From a medical history point of view scrotal cancer is interesting as an occupational cancer. The disease was initially described by Pott in the eighteenth century as a disease common in chimney sweepers [49]. This association led to the discovery of the carcinogenic role of industrial oils, like alkaline ether, and coal tar. Occupation related and induced tumors are rare now. The role of Human Papilloma Virus is unclear [48].


Pathology and Staging and Prognostic Factors



Pathology

The commonest tumor is squamous cell carcinoma. Other tumors include basal cell carcinoma and melanoma [48].


Staging

There is no official TNM classification for scrotal cancer. The spread of th tumour is to the inguinal lymph nodes. Another staging system was based on the probability of surgical treatment (Table 50.2).
Jul 4, 2016 | Posted by in UROLOGY | Comments Off on Cancer Penis and Scrotum

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