Parathyroid Hormone-related Peptide Is a Better Indicator of Cancer Treatment Efficacy Than Serum Calcium.

Anticancer ResOct 28, 2026

Jerome H Check

✦ AI-curated · Sources linked

Case in brief

A 66-year-old woman with extensive cutaneous squamous cell carcinoma of the scalp, unsuitable for primary surgical removal, received cemiplimab. She was hospitalized with severe hypercalcemia while awaiting treatment approval. After the second course, serum calcium had fallen to the low-normal range, but PTHrP had risen markedly. Imaging subsequently demonstrated rapid progression with bone, brain, lung, and liver metastases, and she died shortly thereafter.

What made this case unusual

Serum calcium appeared to improve during treatment while PTHrP rose markedly; subsequent imaging showed rapid metastatic progression.

Diagnostic / clinical pearl

In PTHrP-mediated hypercalcemia, a falling or normalized serum calcium may not reflect cancer control. Serial PTHrP measurement may provide additional information about treatment efficacy.

Source

Published in Anticancer Res. This summary was written by xxcode from the publication's abstract and metadata. It is not peer reviewed and is not a substitute for the original article. For clinical decisions, review the original publication.

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AI-generated summaries may contain errors or omissions. Verify clinically important information with the original publication.

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