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J Pers Med. 2014 Oct 17;4(4):448-58. doi: 10.3390/jpm4040448.

A phase I study of high-dose calcitriol in combination with temozolomide for patients with metastatic melanoma.

Journal of personalized medicine

Erin Pettijohn, Brenda Martone, Alfred Rademaker, Timothy Kuzel

Affiliations

  1. Division of Hematology/Oncology, Northwestern University, 676 N. St Clair, Suite 850, Chicago, IL 60611, USA. [email protected].
  2. Division of Hematology/Oncology, Northwestern University, 676 N. St Clair, Suite 850, Chicago, IL 60611, USA. [email protected].
  3. Division of Biostatistics, Department of Preventative Health, Feinberg School of Medicine, Northwestern University, 680 N. Lakeshore Drive, Suite 1400, Chicago, IL 60611, USA. [email protected].
  4. Division of Hematology/Oncology, Northwestern University, 676 N. St Clair, Suite 850, Chicago, IL 60611, USA. [email protected].

PMID: 25563456 PMCID: PMC4282882 DOI: 10.3390/jpm4040448

Abstract

BACKGROUND: Temozolomide is efficacious as an oral alternative for patients with metastatic melanoma (MM). Calcitriol has anti-proliferative properties and vitamin D receptor (VDR) polymorphisms are associated with alterations in melanoma susceptibility and progression.

METHODS: Tem 150 mg/m2 was administered on days 2-8 and 16-22 every 28 days. Calcitriol was given on days 1 and 15 every 28 days. VDR gene analysis was completed using PCR-RFLP based assays. Tolerability was the primary objective with secondary objectives of time to progression (TTP) and overall survival (OS).

RESULTS: Twenty pts with MM were registered. Cytopenias and thrombosis were the most common grade 3 or 4 toxicities. Median TTP was 1.8 mo. Pts with high-risk VDR genotype tt+/-ff (n = 6) had an OS of 3.8 mo from time of enrollment, compared to 7.4 mo for those with non-tt/ff genotypes (n = 11), although not statistically significant (HR = 1.20, 95% CI 0.41-3.53, p = 0.74).

CONCLUSIONS: The extended dosing of Tem with calcitriol is a well-tolerated regimen. The trend toward improved OS in non-tt/ff VDR genotypes is consistent with prior studies associating the tt/ff genotype with biologic aggressiveness.

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