Subjects with Secondary Raynaud's Phenomenon will receive placebo once a day for the first 4 week cross over period and then PF-00489791 4 mg once a day for the second 4 week cross over period

Subjects with Secondary Raynaud's Phenomenon will receive PF-00489791 20 mg once a day for the first 4 week cross over period and then placebo once a day for the second 4 week cross over period

Subjects with Secondary Raynaud's Phenomenon will receive placebo once a day for the first 4 week cross over period and then PF-00489791 20 mg once a day for the second 4 week cross over period

Subjects with Primary Raynaud's Phenomenon will receive PF-00489791 4 mg once a day for the first 4 week cross over period and then placebo once a day for the second 4 week cross over period

Subjects with Primary Raynaud's Phenomenon will receive placebo once a day for the first 4 week cross over period and then PF-00489791 4 mg once a day for the second 4 week cross over period

Subjects with Primary Raynaud's Phenomenon will receive PF-00489791 20 mg once a day for the first 4 week cross over period and then placebo once a day for the second 4 week cross over period

Subjects with Primary Raynaud's Phenomenon will receive placebo once a day for the first 4 week cross over period and then PF-00489791 20 mg once a day for the second 4 week cross over period

Mean duration of Raynaud's attacks for a time period was calculated as sum of recorded durations of attacks in the time period divided by total number of attacks in the time period where duration was recorded.

Participants were asked to rate their worst Raynaud's pain in the past 24 hours using an 11 point Likert scale, with 0 = no Raynaud's pain and 10 = the worst possible pain. Highest (most severe) response was considered for participants responding at more than 1 point on the scale. Average daily score was considered for participants completing more than 1 Raynaud's pain score scale on a day. Baseline value was calculated as mean of the scores over 7 days prior to treatment start. Post-baseline value was calculated as mean of the scores over the 7-day period prior to the visit.

Presence of ulcer was assessed at baseline. At post-baseline visits, each ulcer was measured and scored: 1= smaller or improved compared to previous visit, 2= same as previous visit, 3= bigger or worse than previous visit, and 4= new. If a new digital ulcer develops during the course of the study, the measurement and scoring were initiated on this additional ulcer. Healed ulcers were not counted into the number of ulcers. Participants with SRP in the per-protocol population with at least 1 digital ulcer present at any assessment were evaluable for this measure. Results are reported for participants with presence of ulcer at baseline and decrease from baseline in ulcers at post-baseline visits.

Only participants receiving PF-00489791 were to be analyzed for this outcome. Data have been calculated by setting plasma concentration values below the lower limit of quantification to 0. The lower limit of quantification is 0.0100 microgram per milliliter (mcg/mL). Data for plasma concentration of PF-00489791 metabolites was not analyzed, as it was not intended to be a secondary endpoint and was deemed optional.

Criteria for laboratory tests abnormalities included: hemoglobin, hematocrit and red blood cells (less than [<] 0.8*lower limit of normal[LLN]); leukocytes (<0.6 LLN /greater than [>] 1.5*upper LN [ULN]; platelets (<0.5*LLN/>1.75*ULN); neutrophils, lymphocytes (<0.8* LLN/>1.2*ULN); eosinophils, basophils, monocytes (>1.2*ULN); bilirubin (>1.5*ULN); aspartate aminotransferase (AST), alanine aminotransferase (ALT), Gamma GT, alkaline phosphatase (>3*ULN); BUN, creatinine (>1.3*ULN); glucose (<0.6 LLN/>1.5*ULN); uric acid (>1.2*ULN); sodium (<0.95*LLN/>1.05*ULN); potassium, calcium, chloride, bicarbonate (<0.9*LLN/>1.1*ULN); albumin, total protein (<0.8*LLN/>1.2*ULN); creatine kinase (>2.0*ULN); Urine Specific Gravity, Urine pH, urine blood, urine glucose, urine protein, urine ketones, urine leukocytes esterase (>=1 high-powered field). Total number of participants with any laboratory abnormalities was reported.

Vital signs assessment included measurement of supine and standing pulse rate, systolic and diastolic blood pressures. Criteria for clinically significant vital signs and orthostatic blood pressure measurements were based on investigator's judgement.

ECG assessment included measurement of PR, QRS, QT,corrected QT interval (QTc)values. Criteria for clinically significant ECG values were based on investigator's judgement.

PF-00489791 tablets 4 mg (2 tablets of PF-00489791 2 mg) orally once daily for 4 weeks in first intervention period and then 2 placebo tablets matched to PF-00489791 orally once daily for 4 weeks in second intervention period to participants with PRP. A washout period of 2 weeks was maintained between each intervention period during which 2 placebo tablets matched to PF-00489791 were given orally once daily.

Two placebo tablets matched to PF-00489791 orally once daily for 4 weeks in first intervention period and then PF-00489791 tablets 20 mg (2 tablets of PF-00489791 10 mg) orally once daily for 4 weeks in second intervention period to participants with PRP. A washout period of 2 weeks was maintained between each intervention period during which 2 placebo tablets matched to PF-00489791 were given orally once daily.

PF-00489791 tablets 20 mg (2 tablets of PF-00489791 10 mg) orally once daily for 4 weeks in first intervention period and then 2 placebo tablets matched to PF-00489791 orally once daily for 4 weeks in second intervention period to participants with PRP. A washout period of 2 weeks was maintained between each intervention period during which 2 placebo tablets matched to PF-00489791 were given orally once daily.

Two placebo tablets matched to PF-00489791 orally once daily for 4 weeks in first intervention period and then PF-00489791 tablets 4 milligram (mg) (2 tablets of PF-00489791 2 mg) orally once daily for 4 weeks in second intervention period to participants with SRP. A washout period of 2 weeks was maintained between each intervention period during which 2 placebo tablets matched to PF-00489791 were given orally once daily.

PF-00489791 tablets 4 mg (2 tablets of PF-00489791 2 mg) orally once daily for 4 weeks in first intervention period and then 2 placebo tablets matched to PF-00489791 orally once daily for 4 weeks in second intervention period to participants with SRP. A washout period of 2 weeks was maintained between each intervention period during which 2 placebo tablets matched to PF-00489791 were given orally once daily.

Two placebo tablets matched to PF-00489791 orally once daily for 4 weeks in first intervention period and then PF-00489791 tablets 20 mg (2 tablets of PF-00489791 10 mg) orally once daily for 4 weeks in second intervention period to participants with SRP. A washout period of 2 weeks was maintained between each intervention period during which 2 placebo tablets matched to PF-00489791 were given orally once daily.

PF-00489791 tablets 20 mg (2 tablets of PF-00489791 10 mg) orally once daily for 4 weeks in first intervention period and then 2 placebo tablets matched to PF-00489791 orally once daily for 4 weeks in second intervention period to participants with SRP. A washout period of 2 weeks was maintained between each intervention period during which 2 placebo tablets matched to PF-00489791 were given orally once daily.