16027 Background: As a result of the improvement in oncological treatments, MPCA could arise as a more frequent problem in Public Health. The purpose of this retrospective review was to estimate both the incidence and medical features of MPCA pts treated at the Instituto Oncológico Henry Moore (IOHM). Methods: We analyzed 17,100 medical charts from our database since 1987 and identified 378 MPC (2,21%). Then we retrieved data over the last eight years (1997–2005). Those pts with at least two second primary tumors were included in this analysis. They were categorized as synchronous (second tumor diagnosis within the first six months from the first one) and metachronous (all the remaining). Pts with skin cancer different from melanoma were excluded. Results: One hundred and seventy eight (M:73; F:105) out of 8,500 cancer pts (2.09%) had at least two primary cancers. Median age was 59, 64 and 68 yo at the moment of the first, second and third diagnosis, respectively. In 138 (78%) pts, the diagnosis of the second cancer was suspected by clinical findings, while in 40 (22%) pts, it was discovered because of medical screening in an otherwise asymptomatic pt. (See Table below) The most frequent site combination was breast-breast (n = 21). A total of 57 pts (32%) had a family history of oncologic diseases. With a median follow-up of 31 mo (range: 0,57–311) after the second cancer diagnosis, 127 pts are still alive (71,35%) and 51 (28,65%) are dead. Conclusions: In the last eight years, 178 (2.09%) pts had developed MPC, being breast, prostate, colon and lung the most frequent (first and later) localizations, and breast-breast the most frequent site combination. The so-called “screening effect” seems to have a low impact on the studied population. [Table: see text] No significant financial relationships to disclose.

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