Penile Carcinoma
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Direct answer
Penile carcinoma is a squamous cell carcinoma arising chiefly on the glans, prepuce or sulcus of uncircumcised men, strongly associated with high-risk human papillomavirus (type 16), chronic inflammation, phimosis, lichen sclerosus and smoking. Diagnosis is by biopsy of the lesion, and the primary is treated by organ-sparing surgery (glansectomy with reconstruction, laser or radiotherapy for small lesions) or partial penectomy ensuring histological clearance, with total penectomy for extensive tumours. Prognosis is governed by the groin: clinically node-negative groins with high-risk primaries (pT1b or worse) need dynamic sentinel node biopsy or modified inguinal lymphadenectomy, and the classic teaching that two-thirds of palpable nodes are reactive — proved by biopsy or fine-needle aspiration — before committing to block dissection.
What you must remember
- Presentation: an indurated, non-healing ulcer, exophytic mass or erythroplakia of the glans or prepuce in a man over 50 with lifelong phimosis.
- Risk factors: HPV 16 (and 18) infection, phimosis with chronic smegma retention and balanitis, lichen sclerosus (BXO), smoking, and immunosuppression; neonatal circumcision is strongly protective.
- Staging is clinical plus MRI of the penis for tunica albuginea or urethral involvement; groin assessment by palpation and ultrasound-guided fine-needle aspiration of suspicious nodes; CT for abdomen and pelvis once nodes are positive.
- Organ-sparing options for small, low-grade distal lesions: wide local excision, glansectomy with split-skin graft, laser and brachytherapy — the tumour is radiosensitive, but local recurrence is higher and surveillance mandatory.
- Partial penectomy: traditional teaching demanded a 2 cm margin; contemporary practice accepts narrower margins (about 1 cm) for distal, low-grade tumours provided frozen-section clearance, since wider margins do not improve survival and destroy function. A remnant allowing standing voiding is the goal.
- Nodal rules: impalpable groins with low-risk primary (pTa, pT1a) may be observed; pT1b or higher warrants staging by dynamic sentinel node biopsy (where available) or modified inguinal lymphadenectomy; bilateral dissection for midline and lateral lesions because drainage is bilateral.
- Palpable node management: fine-needle aspiration to confirm, then inguinal lymphadenectomy; a fixed or ulcerated node set may need neoadjuvant chemotherapy (taxane-cisplatin-fluorouracil, TPF) before surgery.
- Pelvic node dissection when two or more inguinal nodes are positive or there is extracapsular spread — the strongest adverse prognostic factor overall.
How to work through a case
A 58-year-old labourer presents with a foul-smelling fungating ulcer of the glans and a non-retractile prepuce he has never been able to retract; both groins show 2 cm mobile nodes. Step 1: biopsy the visible lesion (or a dorsal slit to expose it) — moderately differentiated squamous carcinoma invading the corpus spongiosum, at least pT2. Step 2: image the penis (MRI for corporal and urethral involvement) and stage the groins: ultrasound-guided FNA of both nodes returns metastatic squamous carcinoma on the left, reactive on the right. Step 3: treat the primary — the tumour involves the distal glans and distal corpora: partial penectomy with frozen-section control and perineal urethrostomy if the stump is too short for forward voiding; counsel him pre-operatively about voiding and body image. Step 4: address the groins after healing — confirmed unilateral metastasis drives bilateral inguinal lymphadenectomy (drainage crosses sides), with a modified template on the clinically negative right side; saphenous-sparing modification reduces flap necrosis and lymphoedema. Step 5: if more than two nodes or extracapsular spread is found, extend to pelvic node dissection and adjuvant chemo-radiotherapy decisions, and follow up for local recurrence and groin disease.
How the exam frames it
The most repeated facts: phimosis and HPV 16 association, protective effect of circumcision, and "two-thirds of palpable inguinal nodes are reactive" — biopsy or aspirate before block dissection, but never simply observe a confirmed node. The second axis is surgical anatomy: superficial inguinal dissection above the fascia lata, the greater saphenous vein's fate (preserved in the modified operation), and complications of the dissection — flap necrosis, lymphoedema, seroma, wound infection — which explain why surgeons are cautious with prophylactic dissection and favour dynamic sentinel node biopsy in equipped centres. The third is margins: exam questions quoting "2 cm margin" reflect older Bailey & Love teaching; current practice permits narrower histologically confirmed margins, so phrase your answer as clearance by frozen section rather than a fixed centimetre. The fourth is Indian reality: advanced neglected primaries with fixed groin nodes are common, and neoadjuvant TPF chemotherapy is the accepted downstaging strategy.
Frequently asked questions
What are the major risk factors for penile cancer?
Phimosis with chronic inflammation, high-risk HPV (types 16 and 18) infection, lichen sclerosus, smoking, immunosuppression and multiple sexual partners; neonatal circumcision is strongly protective.
How are clinically impalpable groins managed?
Risk-stratified: observation is acceptable for low-risk primaries (pTa, pT1a grade 1-2), while pT1b or higher warrants dynamic sentinel node biopsy or modified inguinal lymphadenectomy for staging.
What margin is required at partial penectomy?
Traditional teaching demanded 2 cm clearance; contemporary practice accepts about 1 cm for distal low-grade tumours with intraoperative frozen-section confirmation, preserving function without compromising local control.
Why not simply observe a palpable inguinal node?
Because roughly two-thirds prove reactive, confirmation by ultrasound-guided fine-needle aspiration or biopsy is needed first — but a proven node requires dissection, and delaying nodal surgery for proven disease is the classic fatal error.
When is chemotherapy used in penile cancer?
Neoadjuvant taxane-cisplatin-fluorouracil (TPF) for unresectable or bulky nodal disease to downstage before surgery, and palliatively in metastatic disease; responses are modest and surgery remains the mainstay when feasible.