PMID- 19692320 OWN - NLM STAT- MEDLINE DCOM- 20100330 LR - 20211203 IS - 1938-0682 (Electronic) IS - 1558-7673 (Linking) VI - 7 IP - 2 DP - 2009 Aug TI - Eosinophilic rash secondary to temsirolimus. PG - E34-6 LID - 10.3816/CGC.2009.n.019 [doi] AB - We present a case of a 73-year-old female with metastatic renal cell carcinoma, clear cell histologic subtype, who developed pruritic rash after 2 weeks of 25 mg weekly infusions of temsirolimus. Rash was located on bilateral antecubital areas and posterior knees. Skin biopsy showed spongiotic dermatitis with eosinophils. Based on history and clinical examination, a diagnosis of drug rash secondary to temsirolimus was made. Temsirolimus is a small-molecule inhibitor of the mammalian target of rapamycin (mTOR). Inhibition of mTOR kinase results in cell cycle arrest, antiangiogenesis, and apoptosis. The mechanism of skin toxicity is unknown; however, it can be hypothesized that there is a direct inhibitory effect on signaling pathways that regulate cell growth and tissue repair. The mTOR kinase inhibitor temsirolimus has shown great promise in increasing overall survival in patients with metastatic renal cell carcinoma. Dermatologic toxicities are among the most prevalent and necessitate early recognition and management, in order to maintain quality of life and consistent therapy. The patient presented was initiated on topical clobetasol resulting in rash resolution at a 2-week follow-up visit. FAU - Gandhi, Mona AU - Gandhi M AD - Department of Dermatology, Northwestern University's Feinberg School ofMedicine, Chicago, IL, USA. FAU - Kuzel, Timothy AU - Kuzel T FAU - Lacouture, Mario AU - Lacouture M LA - eng PT - Case Reports PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Clin Genitourin Cancer JT - Clinical genitourinary cancer JID - 101260955 RN - 0 (Antineoplastic Agents) RN - 0 (Intracellular Signaling Peptides and Proteins) RN - 624KN6GM2T (temsirolimus) RN - EC 2.7.1.1 (MTOR protein, human) RN - EC 2.7.11.1 (Protein Serine-Threonine Kinases) RN - EC 2.7.11.1 (TOR Serine-Threonine Kinases) RN - W36ZG6FT64 (Sirolimus) SB - IM MH - Aged MH - Antineoplastic Agents/*adverse effects MH - Carcinoma, Renal Cell/drug therapy MH - Eosinophils/*drug effects MH - Exanthema/*chemically induced MH - Female MH - Humans MH - Intracellular Signaling Peptides and Proteins/*antagonists & inhibitors MH - Kidney Neoplasms/drug therapy MH - Protein Serine-Threonine Kinases/*antagonists & inhibitors MH - Sirolimus/adverse effects/*analogs & derivatives MH - TOR Serine-Threonine Kinases EDAT- 2009/08/21 09:00 MHDA- 2010/03/31 06:00 CRDT- 2009/08/21 09:00 PHST- 2009/08/21 09:00 [entrez] PHST- 2009/08/21 09:00 [pubmed] PHST- 2010/03/31 06:00 [medline] AID - S1558-7673(11)70026-X [pii] AID - 10.3816/CGC.2009.n.019 [doi] PST - ppublish SO - Clin Genitourin Cancer. 2009 Aug;7(2):E34-6. doi: 10.3816/CGC.2009.n.019.