Surreal illustration of calcium veins in a cracking stone body, representing hypercalcemia and cancer.

Rare Cancer Alert: When Penile Cancer Mimics a Hormone Disorder

"Unveiling the unexpected link between penile squamous cell carcinoma and parathyroid-related peptide (PTH-rP) secretion: A case study."


Hypercalcemia, characterized by elevated calcium levels in the blood, is a serious condition often linked to cancer. It occurs when cancer cells release substances that disrupt the body's normal calcium balance. This disruption can lead to a range of complications, significantly impacting a patient's prognosis and quality of life. Understanding the causes and mechanisms behind hypercalcemia in cancer is crucial for effective diagnosis and management.

Penile cancer, while relatively rare, presents unique challenges in diagnosis and treatment. Squamous cell carcinoma is the most common type, often linked to factors such as HPV infection and poor hygiene. Early detection is vital, as the disease can progress rapidly if left untreated. Recognizing unusual symptoms and seeking prompt medical attention are key to improving patient outcomes.

A recent case study sheds light on a rare and complex interplay between penile cancer and hypercalcemia. The study details the experience of a 47-year-old man whose penile squamous cell carcinoma led to the ectopic secretion of parathyroid-related peptide (PTH-rP), a hormone-like substance that dramatically elevates calcium levels. This unusual presentation highlights the importance of considering paraneoplastic syndromes in cancer diagnosis.

The Case: Atypical Cancer Presentation

Surreal illustration of calcium veins in a cracking stone body, representing hypercalcemia and cancer.

A 47-year-old man presented to the emergency department with severe lesions in the genital area and groin, accompanied by fever, weight loss, and muscle weakness. Physical examination revealed warty-like lesions with ulceration and purulent material. A biopsy confirmed penile invasive squamous cell carcinoma. Initial lab work showed leukocytosis and a significantly elevated total serum calcium level of 15.1 mg/dL (normal range 8.6-10.2 mg/dL), adjusted to an albumin-corrected calcium level of 16.9 mg/dL.

Further investigation revealed very low levels of parathyroid hormone (PTH) and a markedly elevated level of parathyroid-related peptide (PTH-rP) at 127 pg/mL (normal range 14-27 pg/mL). These findings suggested that the hypercalcemia was caused by the tumor's ectopic secretion of PTH-rP, a phenomenon known as humoral hypercalcemia of malignancy (HHM).
  • Initial Symptoms: Severe lesions, fever, weight loss, muscle weakness.
  • Diagnosis: Penile invasive squamous cell carcinoma confirmed by biopsy.
  • Key Lab Results: High serum calcium, low PTH, elevated PTH-rP.
  • Treatment Challenges: Extensive injury and infection limited surgical and chemotherapy options.
The patient was initially managed with vigorous hydration and loop diuretics, but these measures were insufficient to control the hypercalcemia. Consequently, a dose of 4 mg zoledronic acid was administered, resulting in a significant improvement. The patient’s calcium levels normalized within four weeks, requiring another dose to maintain normal levels. Imaging studies ruled out distant metastasis but revealed extensive tissue invasion. The tumor's size and infection made surgical resection impossible and the patient was given chemotherapy without success. Due to the infection, a decision was made to focus on palliative care.

Clinical Significance and What to Watch For

This case underscores the importance of considering paraneoplastic syndromes like HHM in patients with cancer. While penile cancer is relatively rare, this case highlights an atypical presentation that can significantly impact patient outcomes. Recognizing the signs and symptoms of hypercalcemia, such as muscle weakness, fatigue, and altered mental status, is crucial for early detection and management. If you or someone you know experiences these symptoms alongside a cancer diagnosis, prompt medical evaluation is essential. Early detection, awareness of paraneoplastic syndromes, and management of hypercalcemia can significantly improve quality of life and treatment outcomes.

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